CP Kinetic Energy Lesson (23-24)

Aim: How does a change in an object’s velocity affect the amount of work done on it?

Kinetic Energy

• Active energy

• Work done in accelerating an object

• Symbol: KE

• Equation: KE = ½mv²

• Unit: J

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Multiple Choice

At which point is the skater’s kinetic energy (KE) the least?

• at the top of the ramp

• at the bottom of the ramp

• halfway between the top and bottom of the ramp

Multiple Choice

At which point is the skater’s kinetic energy (KE) the greatest?

• at the top of the ramp

• at the bottom of the ramp

• halfway between the top and bottom of the ramp

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Draw

Draw energy bar charts (KE only) for when the rollercoaster car is at locations 1, 4, and 5.

Multiple Choice

As a ball falls freely toward the earth, its kinetic energy

• increases

• decreases

• remains the same

Multiple Choice

If the speed of a moving object is doubled, the kinetic energy of the object is

• halved

• doubled

• unchanged

• quadrupled

Multiple Choice

A block with initial velocity v₁ slides along a frictionless track from point A through point E. The kinetic energy of the block will be greatest when it reaches point

• A

• B

• C

• D

Multiple Choice

A cart of mass m traveling at a speed v has kinetic

energy KE. If the mass of the cart is doubled and the

speed is halved, the kinetic energy of the cart will be

• half as great

• twice as great

• one-fourth as great

• four times as great

Multiple Choice

What is the relationship between an object’s KE and its velocity?

• direct

• inverse square

• inverse

• direct square

Multiple Choice

The work done in accelerating an object along a frictionless horizontal surface is equal to the change in the object’s

• momentum

• velocity

• kinetic energy

• potential energy