8th Grade Work, Energy and Power

The ability to do work or cause change:

• work

• energy

• momentum

• power

Energy in the form of motion.

• mechanical energy

• potential energy

• kinetic energy

• momentum

Stored energy in the form of position or condition.

• potential energy

• kinetic energy

• momentum

• mechanical energy

What is needed to calculate work?

• force

• distance

• time

• mass

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

• 12 J

• 8 J

• 20 J

• 5 J

A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?

• 200 J

• 80 J

• 5 J

• 2000 J

A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

• 18 m

• 4 m

• 10 m

• 6 m

Which of these is also considered the law of conservation of energy?

• 1st law of thermodynamics

• Newtons 2nd law

• energy law 10

What is needed calculate power?

• work

• time

• mass

• distance

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

• 100 watts

• 400 watts

• 104 watts

• 50 watts