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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
"Escape velocity" is the speed with which an object would have to leave Earth in
order for gravity to never pull it back. That means that even though Earth's gravity
keeps slowing it and slowing it and slowing it, it never slows to zero. At any
distance from Earth, the object is still moving away. It would only run out of gas
and stop when it got infinitely far away from Earth.
In order to calculate the escape velocity, we simply play that video backwards. We
place the object at 'infinity', let go of it, let Earth's gravity get ahold of it and pull
it all the way in, and we calculate how fast it's going when it hits the ground. It's not
a very difficult calculation, because gravity and distance are so easy to work with.
If we let the object have some kinetic energy before the Earth got ahold of it and
it started falling in, then we'd wind up with a number that's slightly wrong.
Which units are used to express kinectic energy?
Answer= "Joule"
Other Info:
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Kinetic energy is just the energy that a moving body has that could be used to do work.
The standard unit of measure for energy is the "Joule"
If you want to know how to calculate the kinetic energy of a moving mass, use the following equation/formula:
Ke = M * V^2 * .5
Where:
Ke = Kinetic energy
M = Mass
V = Velocity
For example:
When a mass of 1 kg is moving at a velocity of 2 meters per second this is how you'd do the calculations:
Ke = 1 * 2^2 * .5
Ke = 1 * 4 * .5
Ke = 2 Joules
Note: the above calculation does not take into account any force that may slow down (e.g. friction) or speed up (e.g. gravity) the moving mass.
Do a truck and a golf cart have the same kinetic energy?
When they're parked they do (which is zero).
If a truck and golf cart were both moving at the same non-zero speed, the truck, being more massive, would have the greater kinetic energy.
Is it possible for humans to control Kinetic Energy?
YES ...
When a car is moving, it has kinetic energy. If you apply the brakes, the vehicle will slow down and thus loose some of that kinetic energy.
The energy that was kinetic from the fast moving vehicle is transferred into heat energy in the braking mechanism (the rotor disks and pads.)
Is coefficient of friction or coefficient of limiting friction are same?
Limiting friction is just the maximum static friction force (if you go over that point static friction becomes kinetic friction).
Let f = frictional force,
c = coefficient of friction
N = Normal force
fmax = cN = limiting friction
Although the term coefficient of limiting friction is not really used, I'd assume it would just be "c" (it's a coefficient after all). So they would be the same.
If you meant is coefficient of friction the same as limiting friction, than the answer is no. Coefficient of friction is just the "c" in the equation. Limiting friction however is the product of the coefficient and the normal force.
At the bottom , where all potential energy has been converted to kinetic
What are quantities can be determined from velocity-time diagram?
Distance from starting point
Instantaneous velocity
Average velocity
Acceleration or deceleration
Rate of change of acceleration and higher rates of change.
Some of these can only be determined if the diagram is smooth or for smooth parts of the diagram.
Is potential energy slower than kinetic energy?
Potential energy is unreleased energy - an unmoving rock at the top of a cliff, or a stick of dynamite. Potential energy becomes kinetic energy when it is released - the rock is falling from the cliff, or the stick of dynamite is exploding.
So technically the answer is yes. Kinetic even means "motion"!
But be careful about saying that potential energy is "slower" than kinetic, or in trying to distinguish between the two based on how fast you perceive an object to move. Kinetic energy doesn't necessarily make an object "look" as if it is moving faster.
For example, heating water in a microwave converts potential energy (a difference in voltage between the two prongs of the microwave plug) into kinetic energy (an increase in the temperature of the water), but the water doesn't "look" as if it is going "faster" until it actually boils - the actual change in velocity is at the molecular level of the water.
What other kind of energy is there besides potential and kinetic?
Besides potential and kinetic energy, there are various other forms of energy, such as thermal energy (associated with heat), chemical energy (stored in the bonds of molecules), electrical energy (related to the movement of electric charges), nuclear energy (released during nuclear reactions), electromagnetic energy (including light, radio waves, etc.), and sound energy (produced by the vibrations of objects).
If the airspeed is maintained at 200 km/hour with a 50 km/hour tailwind, then the speed over ground will be 250 km/hour (resultant velocity).
Friction between the roller coaster and the track surfaces causes some of the potential energy to be converted to thermal energy. As the roller coaster moves along the track, friction generates heat due to the resistance between the surfaces, leading to a transfer of energy in the form of heat. This conversion ultimately results in a loss of energy from the system.
What are the values of g in free fall physics?
g, as in gravitational force [gravity]? On Earth, it is 9.8 m.s-2.
Acceleration = 7.09 ms-2
G's = 7.09/9.8 = 0.72
What happens if there is no friction?
in case of no friction- firstly, nothing would be able to stand or stop.for eg, if you roll a ball, it will never stop rolling because friction opposes it's movement and stops it. you'll not be able to walk or even stand(though it could be fun to skate around). so everything would be a mess!
Would a lighter person or heavier go faster on a skatebpard?
heaver people would go faster simply because a heaver person could push their weight forward more creating greater acelaration.
