example measurement of kinetic energy?

Answer 1

MEASURING KINETIC ENERGY



CONCEPTS: Kinetic energy, mass, velocity, friction

BACKGROUND: The KE of a moving object can be measured by

observing how far it can drag an object it collides with. A small mass

object moving fast can have as much kinetic energy as a larger object

moving slowly.

EQUIPMENT NEEDED: Marbles or other small balls of various mass,

ruler or other guide track, lined paper and tape, stopwatch



ACTIVITIES:

1. Make a V-shaped catcher from cardboard, a 5x8 index card, etc. Tape

the lined paper and the ruler down to a flat surface. Mark the starting

point for the catcher, making sure it is exactly in line with the ball the

marbles take.

Flick the marble along the track and time how long it takes from

when it leaves the track until it hits the catcher. Precise timing is tricky.

It will take practice. The longer the distance from the ruler to the catcher

the longer the time is and the easier to time accurately, but the more the

marble will slow down due to friction. If no stopwatch is available,

rough qualitative comparisons can still be made. Measure the distance

from the end of the track to the catcher v=d/t.

Note how far the catcher is dragged by the marble. Note the

effect of varying speeds and masses.



2. Do the same experiment on a larger scale with larger balls rolled

across the floor into a larger catcher made from a cardboard box. Try

different designs for the catcher. Use baseballs, tennis balls, softballs

etc. The balls can be rolled without a track to guide them is care is taken

to hit the catcher in the center. Again note the effects of mass and

velocity.



CONNECTIONS: The faster a car is going, the longer the distance

required to stop.

Answer 2

The definition of KE is 1/2MV^2.

So, find something and measure it's mass. Then, set it to moving. Time it over a very short distance to measure its velocity. At the point where you measured the velocity, you know what it's KE was.

One experiment to perform to see the conversion from PE to KE and how the mass and the velocity change is to spring load carts with different masses. You use a spring with a trigger mechanism to launch the carts. For a fixed compression distance, you always have the same PE in the spring. Launch the carts of different masses and see what effect the mass has on the KE.

Now, compress the spring twice as far to get twice the potential energy. Launch the carts again and see if the velocity gets doubled. Should it?

The velocity should go up by sqrt(2)

Answer 3

A airplane flying by the air has a great number of KE and a great number of gravitational ability ability. cycling down a street you've somewhat KE, and your body has some kept chemical ability ability. on the bottom of your bungy bounce the bungy has a great number of kept elastic ability ability, which it really is about to remodel into KE because it hauls you back up. And as you upward push, you're replacing the KE into ....gravitational ability ability, back! develop gravitational ability ability by utilizing putting issues larger. positioned an merchandise on a shelf. Its GPE has higher. round right here, earthquakes lifted the mountains about 10 m a one hundred fifty years in the past and all that kept GPE is busy powering landslides everytime it rains. which will be for the subsequent few thousand years. An merchandise has KE even if it really is transferring. on an same %, a extra large merchandise may have extra KE than a a lot less large merchandise. For products of an same mass , the only transferring two times as quick may have 4 circumstances the KE of the slower transferring one. Summarised contained in the equation KE = m . v^2 / 2 The small rock on the large mountain has way extra GPE. that are you able to particularly ? carry 10lb up 715 feet, or 5 lb up 11,249 feet?

Answer 4

1. Automobile. Weight it with a scale and measure speed with speedometer.
K= 0.5 * m * v^2 (need to convert from weight to mass first)

2. Baseball. Weigh it, and measure both distance from pitcher's mound to home plate, and the time in flight. ( Calculate average speed from distance/ time.)
K(average) = 0.5 * mass * speed^2

Answer 5

energy in motion=force=newtons

Answer 6

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