Work, Power, and Energy Quizizz

In which of the following scenarios is work being done, according to the physics definition?

• Solving an equation

• lifting up a book

• holding a barbell above your head

• keeping a bike from falling as it rolls along a sidewalk

The "power" of a machine measures...

• The work it does

• The force it produces

• The rate of doing work

• Its strength

An object lifted 10m gains 200 J of potential energy. If the same object is lifted 20m, its potential energy gain is...

• Half as much

• The same

• Twice as much

• Four times as much

• More than 4 times as much

Tags

NGSS.HS-PS3-1

It takes 60 J of work to push a large box 6 m across a floor. Assuming the push is in the same direction as the displacement, what is the magnitude of the force on the box?

• 6 N

• 10 N

• 60 N

• 360 N

• None of these

If you do work on an object in one third of the usual time, your power output is...

• One third of the usual power output

• The same as the usual power output

• Three times the usual power output

• Impossible to predict

A 5 kg mass has 100 J of potential energy with respect to the ground. Approximately how high above the ground is the mass?

• 1 m

• 2 m

• 3 m

• 4 m

• None of these

A bow is drawn so that it has 40 J of potential energy. When released, the arrow will theoretically have a kinetic energy that is

• less than 40 J

• More than 40 J

• 40 J

• Impossible to predict

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

If you do 200 J of work in 10 seconds, your power output is...

• 2000 W

• 200 W

• 20 W

• 2 W

An object at rest may also have...

• Speed

• Velocity

• Momentum

• Kinetic Energy

• Potential Energy

Mrs. Steward carries a 50 N cat 10 m across a room. Her arms exert an upward force on the cat equal to its weight. How much work is Mrs. Steward doing on the cat?

• 500 N

• 50 N

• 5 N

• 0 N

• None of the above