Work, Power, and Energy Quiz

Which of the following situations involves no work being done?

• Lifting a box upward

• Pushing a car forward

• Carrying a bag while walking at constant speed

• Pulling a chair across the floor

The unit of work is the same as the unit of:

• Power

• Force

• Energy

• Speed

A force of 20 N moves an object 3 m in the direction of the force. How much work is done?

• 6 J

• 23 J

• 60 J

• 600 J

What is the SI unit of power?

• Joule

• Watt

• Newton

• Pascal

A man lifts a 10 kg box to a height of 2 m. The gravitational acceleration is 9.8 m/s². What is the potential energy of the box?

• 9.8 J

• 19.6 J

• 98 J

• 196 J

The kinetic energy of a body depends on:

• Only its mass

• Only its velocity

• Both its mass and velocity

• Its height above the ground

When an object’s speed doubles, its kinetic energy becomes:

• Half

• Double

• Four times greater

• Unchanged

Which law states that energy cannot be created or destroyed?

• Newton’s 2nd Law

• Law of Conservation of Energy

• Law of Inertia

• Hooke’s Law

A 100 W bulb is left on for 10 seconds. How much energy does it use?

• 10 J

• 100 J

• 1,000 J

• 10,000 J

A car engine does 10,000 J of work in 5 seconds. What is its power output?

• 500 W

• 2,000 W

• 5,000 W

• 50,000 W