PT 3.2 WORK AND POWER

When you apply a force that displaces an object, you have:

• done work on that object.

• balanced the forces on the object.

• broken Newton's First Law of Motion.

• conserved the power used.

A 8.6 kg box is pushed across a floor 3.2 m with a force of 5.5 N. How much work is done on the box?

• 17.6 J

• 8.7 J

• 1.72 J

• No work is done.

A student carries a 10.5 kg book in her bag. How much work is done on the book bag by the student?

• No work is done.

• 160.65 J

• 1.46 J

• 25.8 J

An object of mass 7.8 kg is lifted to a height of 3.3 m. How much work is done on the object?

• 252.25 J

• 8.1 J

• 5.23 J

• No work is done.

How much power is required to do 40.2 J of work in 3.3 s?

• 12.18 W

• 132.66 W

• 43.5 W

• 0.08 W

In order to do 20.5 J of work in 0.46 s, how much power is required?

• 44.57 W

• 9.43 W

• 32.35 W

• 11.56 W

How much work is done when 114 W of power is used over 0.62 s?

• 70.68 J

• 183.87 J

• 57.62 J

• No work is done.

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 
• It measures how much effort is applied over a certain distance
• It measures the change in an object's rate of speed
• It measures how much time it takes to move a massive object

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J
• 7.7 J 
• 0.7 J 
• 770 J 

Tags

NGSS.HS-PS3-2

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

• 600 J 
• 660 J
• 900 J 
• 1200 J 

Tags

NGSS.HS-PS3-2