Lesson: Work and Power

Multiple Choice

Which is the correct unit for work?

• Joules

• Newton

• meter

• Watts

Multiple Choice

Work is done only if

• a force is applied.

• the force applied causes the object's motion.

• an object is in motion.

Multiple Choice

It took 50 Joules to push a chair 5 meters across the floor. With what force was the chair pushed?

• 10 N

• 0.1 N

• 250 N

• 1 N

Multiple Choice

If 40 N of force is applied to a 10 kg cart over a distance of 50 meters, how much work is done?

• 8000 J

• 8000 N

• 4000 J

• 2000 J

Multiple Choice

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts
• 3 watts
• 120 watts
• 270 watts

Multiple Choice

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

• 272 m
• 17 m
• 4.05 m
• 272 cm 

Multiple Choice

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N
• 15 N
• 1.5 N
• 150 N

Multiple Choice

A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?

• 50J

• 50W

• 500J

• 500W