Energy

Work is a transfer of

• energy.

• force.

• mass.

• motion.

What is transferred by a force moving an object through a distance?

• force

• mass

• motion

• energy

The energy of motion is called

• kinetic energy.

• potential energy.

• thermal energy.

• work.

A small 20-kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?

• 22 J

• 40 J

• 80 J

• 400 J

A 13-kg sled is moving at a speed of 3.0 m/s. At which of the following speeds will the sled have twice as much kinetic energy?

• 1.5 m/s

• 4.2 m/s

• 6 m/s

• 9 m/s

An object's gravitational potential energy is NOT directly related to which of the following?

• its height relative to a reference level

• its mass

• its speed

• the acceleration due to gravity

Which of the following is an example of an object with elastic potential energy?

• a wind-up toy that has been wound up

• a compressed basketball

• a stretched rubber band

• all of the above

Why is the gravitational potential energy of an object 1 meter above the moon's surface less than its potential energy 1 meter above Earth's surface?

• The object's mass is less on the moon.

• The object's weight is more on the moon.

• The object's acceleration due to gravity is less on the moon.

• both a and c

A 4-kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat's gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s²?

• 7 J

• 12 J

• 29 J

• 118 J

The gravitational potential energy of an object is always measured relative to the

• location where the object's kinetic energy is zero.

• position of maximum mechanical energy.

• reference level from which the height is measured.

• surface of Earth.