0
Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
Determine the net force on a car moving in a straight line at constant speed?
If traveling at constant speed in a constant direction then net force is zero as
there is no acceleration. Acceleration would change one or the other, or both.
F = ma = m (0) = 0
How do you find velocity given angle and highest point of object?
Use the equation square root of (gravity times distance)/(2 sin theta*cos theta) when the height difference between the initial and final is negligible, meaning the same. If different heights, use the same without the 2 on the bottom. Use the equation square root of (gravity times distance)/(2 sin theta*cos theta) when the height difference between the initial and final is negligible, meaning the same. If different heights, use the same without the 2 on the bottom.
How can air resistence be reduced?
To reduce air resistance, you can streamline the shape of the object moving through the air, reduce the surface area exposed to the air, minimize any appendages or protrusions, and use smooth, aerodynamic surfaces to minimize drag. Additionally, reducing the speed at which the object moves through the air can also help decrease air resistance.
Before the driver hit the brakes, the car's kinetic energy was (1/2 m V2) = (500) (20)2 = 200,000 joules.
After it stops at the stop sign, its kinetic energy and potential energy are both zero. The brakes
turned that whole 200,000 joules into heat, and the wind blew it away.
Unless . . .
Unless the car is an electric or a hybrid. What they do is to take that kinetic energy and put
a lot of it back into the battery, so you can use it again, and you don't completely lose it all.
That's what's the big deal about electric and hybrid cars.
How fast is an object going if its speed and time graph is horizontal?
An object can only gain speed if there is a net force on it. If a net horizontal force acting on an object is large enough, or acts for a long enough time, the object can aquire a speed up to just under the speed of light, 3 x 10^8 m/s.
How are scalar and vector quantities similar?
Scalar and vector quantities are both used in physics to describe properties of objects. They both have magnitude, which represents the size or amount of the quantity. However, the key difference is that vector quantities also have direction associated with them, while scalar quantities do not.
If an object is speeding up to the right what direction does its velocity vector point?
The velocity vector of an object that is speeding up to the right points in the same direction, to the right. Velocity is a vector quantity that includes both magnitude (speed) and direction, so as the object accelerates, the velocity vector will align with the direction of motion.
Calculate the change in potential energy of 8 million kg of water dropping 50 m over Niagara Falls?
The change in potential energy can be calculated using the formula:
ΔPE = mgh
Where: m = mass of water = 8,000,000 kg g = acceleration due to gravity = 9.81 m/s^2 h = height = 50 m
ΔPE = 8,000,000 kg * 9.81 m/s^2 * 50 m = 3,924,000,000 J
Therefore, the change in potential energy is 3,924,000,000 Joules.
A graph showing zero slope for the position vs time always indicates that the object is not moving?
If the speed/time graph slops negatively, that's an indication that the speed
is decreasing, i.e. the object is slowing down. The negative slop is also called
negative acceleration, since acceleration is the rate of change of velocity.
Answer 1
Depends what the speed limit is.
Answer 2
It all depends on...
# If you are in a vehicle or not # If you are in a collision course with another object # If the other object is not static, its approach speed # What safety protection you and/or your vehicle has # If the safety equipment is in good working order If you are not in a vehicle of any sort, you may have serious problems, unless, of course, you are self-propelled and travelling parallel to, or away from the earth.
If people can't create energy then where do we get energy?
We use energy that has been in existence, in some form, since the beginning of the Universe.
Actually, humans do "create" energy. We use a chemical process to break down various food molecules, releasing the bonding energy which formerly held such molecules together.
As the mass of an object moving at a given speed decreases its kinetic energy does what?
As the mass of an object moving at a given speed decreases, its kinetic energy also decreases proportionally. Kinetic energy is directly proportional to the mass of the object, so a decrease in mass will result in a decrease in kinetic energy.
What is the mass of an object with kinetic energy?
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
How many yards per minute is this if you are going 12 miles an hour?
12 mph equates to 352 yards per minute.
Does a horizontal line on a distance-time graph means the object is moving at a constant speed?
You cannot. A distance vs time graph only measures radial distance - that is, distance from the origin to the object. If the object is going around the origin along a circular path, the distance vs time graph will not show any change in distance.
The [incorrect] answer that you are required to give is that the graph will be a horizontal line during that period. But as explained above, the horizontal graph only means the object has no movement towards or away from the origin, not that it has no movement.
If you Add up the total kinetic energy and potential energy what does that give you?
The sum of potential and kinetic energy gives you the Mechanical Energy of the system
Average velocity always equals one-half the sum of the initial and final velocities?
Is this a question? or a statement that you are unsure of?
Well anyways, this would be correct if acceleration was a constant but if acceleration is not a constant, the (not-constant) acceleration would change the rate of velocity and thus that statement/question would be false.
When you add heat to a solid does its kinetic energy rise?
Yes, adding heat to a solid increases the kinetic energy of its particles, causing them to vibrate more rapidly within their fixed positions. This increase in kinetic energy leads to a rise in temperature, which can eventually cause the solid to melt into a liquid.
What is the momentum and derive the formula for the momentum?
Momentum is the product of the mass and the velocity of an object. It's SI unit is kgms-1.
Correct, but perhaps more easily interpreted as kgm/s.
Vf = Vi + at
Where Vf = final velocity
Vi = initial velocity
a = acceleration
t = time
The equation that relates the distance traveled by a constantly accelerating object to its initial velocity, final velocity, and time is the equation of motion: [ \text{distance} = \frac{1}{2} \times (\text{initial velocity} + \text{final velocity}) \times \text{time} ]
This equation assumes constant acceleration.
Convert 30000 feet into miles per hour?
To convert feet to miles, divide by 5280 (1 mile = 5280 feet). To convert hours to miles per hour, divide distance in miles by time in hours. Thus, to convert 30000 feet to miles per hour, first convert feet to miles (30000/5280), then divide by the number of hours to get miles per hour.
Which word equation is used to calculate the acceleration of a object?
The word equation used to calculate acceleration is: acceleration = change in velocity / time taken. This equation quantifies how an object's velocity changes over a period of time, giving a measure of its rate of acceleration.
