PHYSICAL SCIENCE Ch 12 Test: Work & Energy

Front

What is the equation for Efficiency?

Back

Efficiency = useful work output / work input.

Front

What is an example of a wheel and axle?

Back

Pulley.

Front

How do you calculate gravitational potential energy?

Back

Gravitational potential energy = mass x gravity x height.

Front

What is the gravitational potential energy of a 40 kg box that is 6.0 m above the ground?

Back

2400 J.

Front

What is the equation for Kinetic Energy?

Back

Kinetic energy = 1/2 x mass x speed squared.

Front

How much work does a boy do on a parked car if he pushes with a force of 100 N and the car does not move?

Back

Zero.

Front

Define work in the context of physics.

Back

Work is done when a force causes an object to move in the direction of the force.

Front

What is the unit of work?

Back

Joule (J).

Front

What is the relationship between work and energy?

Back

Work is a transfer of energy.

Front

What is the formula for calculating work?

Back

Work = force x distance.