Work and Energy

Work and Energy

by William Lovering

Multiple Choice

what is the unit of work?

• Newton

• Joule

• Watt

• meter

Multiple Choice

what is the formula needed to solve for work?

• w=f/d

• w= fd

• w=f+d

Multiple Choice

if you push a cart with a force of 60 N for 2 m... how much work have you done

• 120 J

• 30 J

• 120 N

• 30 N

Multiple Choice

Two people shove on a wall with 100 N. The wall doesn’t move. How much work is done?

• 100J

• 100N

• 0J

• 0N

Multiple Choice

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has she done?

• 600 J

• 450 J

• 900 J

• 1200 J

Multiple Choice

50 J of work is done lifting a 20.0 N book in the air. How high was it lifted?

• 2.5 m

• 3.5 m

• 0.4 m

• 25 m

Multiple Choice

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

• 15 J
• 45 J
• 0 J
• 5 J

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 golf pro swings his driver with a mass of 0.75 kg at a velocity of 60 m/s. What is the kinetic energy of the club?

• 22.5 J

• It doesn't have kinetic energy-it has potential energy.

• 2,700 J

• 1,350 J

Multiple Choice

Determine the potential energy of a 5 N book that is moved to three different shelves on a bookcase. The height of each shelf is 1 m, 1.5 m, and 2.0 m.

• 5 J, 7.5 J 10 J

• 5 J, 3.3 J, 2.5 J

• 2.5 J, 5.625 J, 10 J

Multiple Choice

A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. What is the KE of the car?

• 22,400 J

• 44,800 J

• 896,000 J

• 1,792,000 J

Multiple Choice

An 2 kg apple is hanging in a tree, 10 ft off the ground. What is the gravitational potential energy (gravity = 9.8 m/s²) of the apple?

• 960.4 J

• 98 J

• 1920.8 J

• 196 J

Multiple Choice

A golf ball has a mass of 0.046 kg. It is dropped and has 1.1 J of gravitational potential energy (gravity = 9.8 m/s²). What height was it dropped from?

• 2.4 meters

• 234 meters

• 0.41 meters

• There isn't enough information to determine the height.

Multiple Choice

There is a bell at the top of a tower that is 45 m high. The bell weighs 100 kg. What is the potential energy of the bell?

• 980 J
• 441 J
• 4,500 J
• 44,100 J

Multiple Choice

A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. What is the KE of the car?

• 22,400 J
• 44,800 J
• 896,000 J
• 1,792,000 J

Multiple Choice

Newtons are the correct unit for which of the following?

• Force

• Work

• Power

• Acceleration

Multiple Choice

Which is the correct unit for work?

• Joules

• Newton

• meter

• Watts

Multiple Choice

What is the correct unit for power?

• Watt

• Joules

• Newtons

• seconds

Multiple Choice

What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?

• 250 W

• 0.004 W

• 56,250 W

• 25 W

Multiple Choice

How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)

• 70 W

• 3.5 W

• 7 W

• 350 J

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

A force of 100 Newtons was necessary to lift a rock. A total of 150 Joules of work was done. How far was the rock lifted?

• 1.5 m

• 0.4 m

• 15,000 m

• 15 in

Multiple Choice

A monkey weighing 50 N climbed a height of 3 m up a tree in 20 s.

Calculate power needed by the monkey

• 7.5 W

• 750 W

• 150 J

• 1500 J