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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
The acceleration of the ball (after it leaves the thrower's hand) is the acceleration due to gravity, g.1 The vertical velocity of the ball at its apex is zero. The horizontal velocity is constant throughout the ball's flight; it is whatever it was at the outset of its arc.2 ---------------- 1. The acceleration due to gravity, g, is -9.8 m/s2 or -32.2 ft/s2. 2. Ignoring the effects of air resistance, which tend to slow things down.
What is the mean translational kinetic energy of the gas molecules?
The expression for gas pressure developed from kinetic theory relates pressure. The more familiar form expresses the average molecular kinetic energy, energy used here is limited to the translational kinetic energy of the molecules.
Is it possible for two objects to ever have the same velocity but different accelerations?
Yes. You could have two objects with the same final velocity (momentum, if they have mass), but having each one accelerated differently.
Imagine object A starts from 5 m/s, and is accelerated over 1 second with acceleration of 20 m/s2 to attain a final velocity of 25 m/s.
Now, imagine object B starts from 15 m/s, and gets an acceleration over 1 second of 10 m/s2 to attain the final velocity of 25 m/s.
Both end up with the same velocity, but had different accelerations.
How do I calculate acceleration from change in velocity and distance?
change in velocity (v) = acceleration (a) x time (t); distance s = 1/2 a times t squared; solve for time and substitute; find a = v squared /(2s)
How do you convert mph to hertz?
You cannot.
Miles per hour is a measure of speed, with dimensions [LT^-1] whereas Hertz is a measure of frequency, with dimensions [T^-1]. According to the very basic rules of dimensional analyses, conversion between the two is not valid.
The process of changing velocity?
Changing velocity involves either increasing or decreasing speed, or changing direction. This can be achieved through acceleration, which is the rate of change of velocity over time. In other words, when an object speeds up, slows down, or changes its direction, its velocity is changing.
What is the equation for the curve of an acceleration vs mass graph?
It depends on the force acting on the body in question.
Depending on which way you want your independent and
dependent variables set up, the equation is either
Acceleration = Force/mass
or
Mass = Force/acceleration
Why don't you do any work when you carry an object art a constant velocity?
Well, if you do that for a while, you could certainly raise a sweat, and you would say
that you've done a lot of work. But in the strict Physics definition of "work", none of
it has been done to the object you carried.
The strict definition is: Force acting through a distance.
Referring to the object you carry:
-- You don't move it vertically. You just hold it there against the force of gravity,
but your vertical force doesn't move it up or down. So no work is done vertically.
-- Horizontally, the speed is constant. No force is required to maintain a constant
speed, so no work is done horizontally either.
What is meant by kinematic equation of motion?
Simply put, kinematics is really just physics without forces or masses. That is, you deal with velocities, accelerations, time, etc. So a kinematic equation will have those variables.
The kinematic equation of motion could be any of the four equations I list, or any variation of them (they can be rewritten in a number of ways):
let d = distance, v = velocity, i = initial velocity, a = acceleration, t = time
v = i + at
d = it + (1/2)t2
v2 = i2 + 2ad
d = (1/2)(i + v)t
The equations describe the motion, whether it describing it's acceleration, velocity, distance traveled along a certain axis, all with respect to time.
How does the surface of an object affect its motion?
The surface of an object affects the aerodynamic drag: a force which acts against the direction of motion.
What is the speed of a train travelling 120 km per hour What is the speed in meters per second?
33.3km/sec
Does a roller coaster use potential and kinetic energy?
I'm taking a physics final tomorrow, so i know this. Potential Engergy: (change in potential energy) =mgh (h is the change in the elevation)(m is mass)(g is gravity which is 9.81) Kinetic Energy: Energy =(1/2)mass x velocity(squared)
The average vibration of molecules in an object is measured by?
The average vibration of molecules in an object is typically measured using temperature. Temperature is a measure of the average kinetic energy of the molecules in the object, which is directly related to their vibrational motion. By measuring the temperature of an object, we can infer the average vibrational energy of its molecules.
What is the graph of displacement directly proportional to the cube of time?
If the displacement varies as the cube of time then acceleration is linear in time.
In physics and engineering, the time rate of change of acceleration is called "jerk."
(See related link.)
1. We are given that the displacement of a particle is proportional to the cube of the time.
We put this statement into the form, d= c * t3.
2. The velocity of an object is the time rate of change of position (displacement).
v=3c*t2
3. The acceleration of an object is the time rate of change of the velocity.
a=6c*t
4. The acceleration is then linear in time and the jerk is, j=6c.
What is the highest sneeze recorded in miles per hour?
the highest recorded sneeze speed is 160 kilometres per hour
How fast is 46.6 miles per hour in kilometers per hour?
46.6 m/h (1.609 kilometers/1 mile)
= 75.0 kilometers per hour
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What is the coefficient of static friction for wood on paper?
It's not a matter of "how much" friction paper has. When talking about friction, you have a friction coefficient, which is determined by a lot of factors: Surface, surface area in contact, pressure applied, and more.
There may be a formula out there to predetermine the friction two surfaces might have, but honestly just doing some tests yourself would be better.
You also need to specify what kind of paper, because even "notebook paper" isn't specific enough, as I know different companies' paper feels different to the touch.
What is the formula for moment of a force?
Turning moment (Nm) = Force (N) x Perpendicular Distance from the pivot to the line of action of the force (m)
What is the Principle upon which fixed wing aircraft fly?
The wing of an air craft is shaped in such a way that when it moves forward through air separating the air the air that travels over the top of the wing has further to go to rejoin the air at the back of the wing than the air that travels along the bottom of the wing. This results in a partial vacuum, or if you like Suction over the wing. Combine this with enough speed and you have an object that will fly.
How fast 1600 kilometers per hour to move in miles per hour?
1,600 kilometers per hour is 994.19 miles per hour.
How fast is ten to the seventh power meters per second?
Ten to the seventh power is equal to 10,000,000. So, ten to the seventh power meters per second would be 10,000,000 meters per second, which is extremely fast - much faster than the speed of sound or light.
What is the kinetic energy of a 855 kg car with a velocity of 15.5 ms?
Classical kinetic energy in joules (assuming the speed of the object is much less than the speed of light) is given by:
E = 1/2 m v2
where m is the mass in kilograms (kg), and v is the speed in metres per second (m s-1)
So in this case, m = 15 kg, and v = 2 m s-1
E = 1/2 x 15 x 22
= 30 joules
388 kph is approximately 241 mph. This speed is faster than most cars and is typically seen in high-speed trains or planes.
