Work and Energy Quiz

In which of the following situations do your arms do work on books?

• Dropping a stack of books onto a table

• Carrying a heavy stack of books

• Holding a heavy stack of books while standing

• Picking up a pile of books from the floor

How much work is done lifting a 9.10-kg box straight up onto a shelf that is 1.80 m high?

• 16 J

• 50 J

• 160 J

• 5 J

A 10-kg box sits on the floor. Approximately how high would you have to lift the box to increase gravitational potential energy by 350 J?

• 15 m

• 7.0 m

• 3.6 m

• 35 m

Tags

NGSS.MS-PS3-2

As you throw a ball, you exert a force on that ball of 4.2 N. You exert this force on the ball while the ball moves a distance of 0.50 m. The ball then leaves your hand and travels a horizontal distance of 8.5 m to your friend. How much work have you done on the ball?

• 2.1 J

• 4.2 J

• 8.4 J

• 16.8 J

Tags

NGSS.MS-PS3-5

What are three ways that simple machines can make work easier?

• Increase force, change direction, increase speed

• Decrease force, increase distance, change direction

• Increase force, decrease distance, increase speed

• Decrease force, change direction, increase speed

Tags

NGSS.MS-ETS1-1

It takes 600 J of work to lift a crate straight up but 1200 J to push that crate up a ramp to the same height. What is the efficiency of the ramp?

• 30 percent

• 75 percent

• 50 percent

• 200 percent

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Compare the output force with the input force for a machine that has a mechanical advantage that is greater than one.

• The output force is equal to the input force.

• More information is needed.

• The output force is greater than the input force.

• The output force is less than the input force.

Tags

NGSS.MS-PS2-2

Using the scientific definition, which statement is always true of work?

• It is difficult.

• It involves levers.

• It involves a transfer of energy.

• It is done with a machine.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The kinetic energy from an object's motion always changes when which factor changes?

• the object's volume

• the object's speed

• the object's direction of motion

• the object's chemical potential energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is the gravitational potential energy of an Earth-dictionary system if the dictionary has a mass of 5.0 kg and is located 2.0 m above the ground? Use the ground as the reference level.

• 10 J

• 20 J

• 98 J

• 50 J

Tags

NGSS.MS-PS3-2