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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
Why pressure is scalar quantity where as force is vector quantity?
Pressure is the force acting in all directions on an area while force is a push or pull in a direction. To understand this, we have to know how pressure or force originates. While the force is applicable to rigid materials, the term pressure is applicable for bulk materials (like water) where individual particles are considered as soft. When a force is applied from one direction on the soft particle, the soft particle gets distorted and projects out in all directions. Pressure thus do not have any unique direction but all, while a force has a unique direction. When a bomb blasts, it effects in all directions in air whereas if a running car hits, it effects in the specific direction only. A parameter effecting in all directions uniformly is considered as if it is a scalar.
The pressure acts to all the directions uniformly. I mean in 360 degrees. So, we can't define a direction for pressure.
The formula P= F/A is only the magnitude relation, not direction. It should be kept in mind.
Mathematically, it can be understood as pressure is the ratio of force and vector area (which has direction along the normal to the surface upon which the force is acting, and if the force is not normal to to the surface we take component of force along normal. )
Total change in momentum = zero (law of conservation of momentum).
Also, a change in momentum is equal to the impulse, which is force x time .
A formula is: d/dt (Mv) = F, which is one of Newton's laws of motion.
Friction helps objects grip and prevent slipping. It allows for traction between surfaces, enabling us to walk, drive vehicles, and hold objects securely. Additionally, friction is essential for processes like writing with a pen or pencil because it creates the necessary resistance for the ink or graphite to transfer onto paper.
How is energy conserved when a tv is working?
When the TV is on the light and sound is coming out so when the two energies are active it produces heat.
What factors affect an objects kinetic energy?
Kinetic energy of a body depends on:
(a) Its mass;
(b)Its velocity, K.E=mv2/2...
And its potential energy depends on,
(a)Its mass
(b)Acceleration due to gravity
(c)Height from reference point (P.E=mgh)
(This situation describes only when gravity is involved. When other forces are present, such as coulomb, nuclear forces etc, there is potential energy associated with the forces too.)
Kinetic and potential energy are affected by various factors. Let's dive into them. Kinetic energy is the energy an object produces when moving. Due to gravity, kinetic energy is affected by the object's mass and velocity.
What causes rough acceleration on a 2001 Chevy impala?
Rough acceleration in a 2001 Chevy Impala could be caused by issues with the fuel system, such as a clogged fuel filter or dirty fuel injectors. It could also be due to a problem with the ignition system, such as faulty spark plugs or a malfunctioning ignition coil. Additionally, a dirty air filter or a vacuum leak could also result in rough acceleration.
One object has twice as much mass as another object the first object also has twice as much what?
weight = mass * gravity, so as long as the force of gravity is the same on both, an object with twice the mass will weigh twice as much.
The question is already resolved into horizontal and vertical components for us.
This is a very thoughtful and considerate favor, because now, we can completely
ignore the horizontal details.
-- The bullet is fired with an initial vertical velocity component of 50.0 meters/second.
-- The bullet will continue ascending for 50.0/10 = 5.00 seconds, before it
runs out of gas, surrenders to gravity, and begins to descend.
Additional factoids that emerge from the work but are not required for full credit
on the exam question:
-- The gun is aimed 30 degrees above the horizontal, and the bullet leaves it at 100 meters/second.
-- The highest altitude above ground achieved by the bullet is (125 meters) + (altitude of the gun muzzle).
-- Horizontal distance the bullet travels at or above the altitude of the gun muzzle is
(86.6 m/s) x (10 sec) = 866 meters. -- The Earth's curvature, and the effects of air resistance, are ignored to make
the calculation easier.
-- We're dealing with a very slow bullet here. Even the mild-mannered 22-caliber
"Short round" , with a 1.9-gram bullet and either a small amount of gunpowder
or none at all, intended only for indoor training or target practice, has a typical
muzzle velocity of around 210 meters/second ... double that of the fearsome
projectile described in the question.
No, it is a scalar. Energy is the capacity to do work.
Answer2:
Yes. Energy is a scalar and a vector. Energy is a Quaternion quantity consisting of a scalar and three vectors, forming a 4D quantity.Early scientists started with scalar quantities. With Faraday's field theory (directed lines), vectors came into physics.
However, the early definition of energy as scalar persisted to this day.
Vector energy is all around us, but we are blinded by dogma. F.D is called energy, but FxD is vector energy but is called Torque.
I think we are about to lift the blindness. "Dark Energy" in Astronomy is vector energy. The Dark Energy is cmV = cP. Here is vector energy, Momentum energy. Momentum is a vector and Momentum energy cP is also a vector. A scalar c times a vector is a vector ! If there is vector momentum, there must be vector energy!
The correct Equation off Gravitation Energy is E = -mGM/r + mcV = -mu/r + cP.
Newton did not include the vector energy cP=cmV. This was equivalent to saying the mass m, had velocity zero , E= -mu/r + mc0. Such is NOT the case. This is like saying the earth is orbiting the sun with velocity 0, when it is moving at 30km/s. it is the vector energy cmV that provides the centrifugal force to keep the earth from falling into the sun. It is the vector energy that is the "dark Energy" that is the anti-gravity (centrifugal) force. Vector Energy removes teh mystery of "Dark Energy".
Newton's Three laws are derived from this vector energy, that Newton incorporated.
Force F = XE = [d/dr, DEL] m[-u/r , cV]
F = m[v2/r - cDEL.V, cdV/dr +u/r3 R + cDELxV]
At Equilibrium 0 = F and DELxV=0 meaning R and V are parallel and. It is essential that DELxV =0 for the vectors to sum to zero.
The result is
0 = m[v2/r - cv/r, cdV/dr + u/r3 R ]
Equilibrium Condition exists when v/c=1 or v=c.
Newton's Equal and Parallel phrase comes form
0 = m(dV/dt + u/r3 R) comes from
0 = cdV/dr - DEL u/r
Newto added the term 'mdV/dt' a vector, before vectors, This term is the vector energy P=cmV and dcP/dr = cmdV/cdt = mdV/dt, voila!
It is time to recognize that we live in a 4D Universe and Energy is a 4D Quantity.
Must a particle have non-zero rest mass in order to have momentum?
Yes. A particle of zero rest mass has ONLY its relativistic mass when in motion. There are actually no photons just sitting around.
Can the velocity of an object be negative when its acceleration is positive?
Yes, velocity of an object can be negative. This can be better explained with object in free space like aircraft. Aircraft's speed is measured relative to direction in which it is flying, its usually called airspeed. You might have seen in many modern fighter aircraft videos that's maneuvering, they fly straight up and then they fall vertically. During this vertical fall, aircraft is accelerating downwards & due to suction created in-front of pitot tube (Device used to measure airspeed) velocity measured is negative.
A. mass times its velocity. Momentum is calculated by multiplying an object's mass by its velocity.
Scalars are quantities that have magnitude only; they are independent of direction. Conversely, vectors have both magnitude and direction.
A scalar quantity is any numeric value that has no spatial direction. So let's look at your four tests.
- Time. We can give it a numbers; so it qualifies as a numeric value. Can it have spatial direction? No. It marches on, but in no direction. Saying 2 minutes south, for example, makes no sense whatsoever. So it's a scalar quantity.
- Speed. Again with the numbers...25 mph for example. But can it have a direction. Yes. 25 mph heading north makes sense; and because it also has direction it is not a scalar but a vector; when speed has a direction it is called Velocity. Note: all vectors will have a scalar component, but not all scalars will have direction.
- Position. This is tricky. What is the numeric value of position? Distance...25 miles, for example, gives us an interval in space. Can this interval have spatial direction? Yep. 25 miles north of my house, for example, gives the direction of the interval. But like velocity, if we leave off the direction, we are left with the scalar...25 miles. In fact, position and velocity are related. If I divide the 25 miles north by 1 hour interval in time to travel to that position, I'd have 25 mph north...the previous velocity.
- Acceleration. We can assign numbers, like 9.81 m/s²; so without direction, it is a scalar. Does assigning a direction make sense? Sure. Braking at 4 m/s² in a westerly direction makes perfect sense. So, with its direction added, acceleration can be a vector just like position and velocity. In fact, the three are related, which is why they are all three capable of being vectors.
What could cause a Mazda B2200 to begin stalling after reaching 55 or 60 miles per hour?
One possible reason for stalling at higher speeds could be a clogged fuel filter or a failing fuel pump that is not supplying enough fuel to the engine. Another common issue could be a malfunctioning mass airflow sensor or a problem with the ignition system such as faulty spark plugs or a failing ignition coil. It is recommended to have the vehicle diagnosed by a mechanic to determine the exact cause of the stalling issue.
Vector quantities are the quantities that have magnitude as well as direction. To express a vector quantity, we must specify the direction along with the magnitude.
Examples are :- velocity, acceleration, torque, momentum, impulse, amplitude, wavelength,etc..
Kinetic energy is the energy that an object has due to its motion or movement. For instance if a car drives into a wall the energy of its movement is what destroys the wall, That energy is kinetic energy.
Note: Heat is also a form of Kinetic energy because heat is the movement (vibration energy) of atoms or molecules.
How are temperature and kinetic energy related?
Matter is made up of particles (atoms and molecules); temperature is closely related to the average kinetic energy per particle. More precisely, the average kinetic energy per particle per degree of freedom.
What would the kinetic energy of a rock sitting on the ground be?
Zero.
You need to think in terms of "frame of reference" as in what are you comparing the rock to. If you are an observer sitting next to the rock then the kinetic energy of the rock RELATIVE TO YOU is zero - I.E. the rock isn't moving relative to you and thus has no kinetic energy - energy of motion - relative to you.
If you are an observer sitting a million miles from earth watching the rock then it is zipping around at 1000 miles per hour as the earth spins on its axis and it has significant kinetic energy RELATIVE TO YOU. You need to think in terms of "frame of reference" as in what are you comparing the rock to. If you are an observer sitting next to the rock then the kinetic energy of the rock RELATIVE TO YOU is zero - i.e. the rock isn't moving relative to you and thus has no kinetic energy - energy of motion - relative to you.
If you are an observer sitting a million miles from earth watching the rock then it is zipping around at 1000 miles per hour as the earth spins on its axis and it has significant kinetic energy RELATIVE TO YOU. ---- So we don't get bored, no kinetic and no gravitational potential energy.
You were going 42 mph in a 25 mph how much is your ticket?
The cost of a speeding ticket can vary depending on location, but going 17 mph over the speed limit could result in a fine of $150-$200. Additionally, there may be additional fees and court costs associated with the ticket.
Why does a car slow down sputter then backfire on acceleration?
This is a very broad question, but I will say this it is more than likely bad fire (spark) or bad fuel (not enough, too much, poor quality). Spark could be any thing from sparkplug all the way back up to the distributor or timing. Fuel could be water or rust in the fuel, clogged injector/injector's. probably NOT fuel pump or filter.
By seeing the basic deifinition v=ds/st and a=dv/dt, so for a free fall of a body the acceleration of the body remains constant its graph will straight line parallel to the time axis, velocity graph will be one degree higher as it is obtained by integrating acceleration, hence its graph will be one degree higher and will be inclined at some angle and the graph of displacement will be still one degree higher (i.e. parabola)
notes: 1) area under the velocity time diagram for a given time interval is equal to the displacement over the interval 2) similar area under acc time diagram gives velocity over that period.
On earth, the acceleration due to gravity is a constant 9.8 m/s2 so a graph of acceleration vs time would have the equation a = 9.8 m/s2. As said above, the graph of acc. vs t would be a horizontal line (zero slope) with a y-intercept of 9.8 m/s2. The area under this line is a rectangle with a width, t, and a height of 9.8 m/s2, so change in velocity is given by delta v = (9.8m/s2) t. The area under this line is a triangle with a height of delta v and a base of t, so the equation for change in position or displacement is delta x = 1/2 (delta v)(t) or delta x = (4.9 m/s2)t2
If you know the equation of the displacement vs time graph for freefall (delta x = 1/2 g t2 where g=9,8 m/s2), get the graph by plotting delta x for various times. From that graph, find the slope of the tangent to the curve (A TI-83 calculator can do this) at various times. Plotting slope of tangent vs time gives you a velocity vs time graph. Plotting the slope of the velocity/time graph vs time gives you the acceleration vs time graph.
Who invented the kinetic energy?
The concept of kinetic energy was introduced by Johann Bernoulli, a Swiss mathematician and physicist, in the 18th century. He defined kinetic energy as the energy possessed by an object due to its motion.
What causes a musty odor when heat is turned on in a 1998 explorer?
IT IS USUALLY CONDENSATION FROM YOUR AIR CONDITIONING, IT GROWS MOLD AND BACTERIA. WHICH WILL SIT THERE ALL SUMMER AND WINTER. HOWEVER IN THE WINTER WHEN YOU BLOW YOUR HEAT IT WARMS UP THE BACTERIA AND MOLD. THERE IS A PRODUCT CALLED FRIGI-FRESH MADE BY B.G. WHAT YO NEED TO DO ONCE YOU GET FRIGI-FRESH IS SPRAY IT IN THE FRESH AIR INTAKE. USUALLY LOCATED BETWEEN THE WINDSHIELD AND HOOD. WITH YOUR AC ON FULL BLAST. SPRAY THE WHOLE CAN. THIS SHOULD FIX YOU UP
Why would a 1999 Ford F150 V6 have sluggish acceleration only below 35MPH?
Sluggish acceleration at low speeds in a 1999 Ford F150 V6 could be due to issues with the fuel system, such as clogged fuel injectors or a dirty fuel filter. It could also be caused by a malfunctioning mass airflow sensor or a problem with the transmission, such as a clogged filter or low fluid level. It's best to have a professional mechanic diagnose and address the specific cause of the issue.
Why does the 1992 Grand Am lose power after it reaches 40 miles per hour?
Both times that this has happened on my 2001 Buick Regal AND 2001 Grand Am it has been a clogged Catalytic Converter. Both times it was covered by a blanket 120,000 mile warranty regardless of whether or not you are the original owner. Take the car to a reputable GM dealer for this.
