Practice Exam: Energy, Work & Power

Front

Newtons are the unit for _____________.

Back

Force

Front

You exert 200 J of work by pulling on an object with 20 N of force. What distance is the object moved?

Back

10 m

Front

A 180 gram softball is thrown into the air using 40 J of work. How much power was exerted throwing the ball?

Back

20.4 W

Front

At what point in a pendulum's swing is its mechanical energy the least?

Back

Its mechanical energy is constant throughout.

Front

How much work is done in holding a 15 N sack of potatoes while waiting in line for 3 minutes?

Back

0 J

Front

Define Work in physics.

Back

Work is done when a force causes an object to move in the direction of the force. It is calculated as Work = Force x Distance.

Front

What is the formula for Power?

Back

Power = Work / Time.

Front

What is the relationship between Work, Force, and Distance?

Back

Work is the product of the force applied to an object and the distance the object moves in the direction of the force.

Front

What is Mechanical Energy?

Back

Mechanical energy is the sum of potential energy and kinetic energy in a system.

Front

Define Potential Energy.

Back

Potential energy is the energy stored in an object due to its position or configuration.