Work and Power

Multiple Select

Two factors that determine work are...

• Force

• Mass

• Velocity

• Distance

Work Formula

Work is found by multiplying Force and distance

Multiple Choice

If the object does not move then what is happening

• nothing

• work

• power

• no work is being done on the object

Multiple Choice

The ( ) the force the ( ) work is done

• less, more

• smaller, more

• bigger, more

• bigger, less

Multiple Choice

Fred kicks a ball with a force of 20N to George, who is 5M away.

How much work was done to the ball?

• 25 J

• 100 J

• 4 J

• 75 J

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

You do work when you mannequin pose with an object in your hand.

• True

• False

Power

Power is the rate at which something does work over a period of time

Multiple Choice

Work divided by time equals...

• energy

• power

Multiple Choice

The unit used to measure power is the 

• Watt

• Newton

• Joule

• Newton*meter

Power Formula

Power is found by dividing by Work done by the time taken

Multiple Choice

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s

• 8 s

• 64800 s

• 80 s

Multiple Choice

Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.

• Person A

• Person B

Multiple Choice

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts

• 3 watts

• 120 watts

• 270 watts

Work and Power

Multiple Choice

A force of 4 N moves a box a distance of 3 m in 6 s. How much power is exerted?

• 2 W

• 6 W

• 17 W

• 278.7 W

Multiple Choice

Which of the following would produce the most power?

• A mass of 10 kilograms lifted 10 meters in 10 seconds 

• A mass of 10 kilograms lifted 10 meters in 5 seconds

• A mass of 5 kilograms lifted 10 meters in 5 seconds

• A mass of 5 kilograms lifted 5 meters in 10 seconds

Multiple Choice

You move an 8-newton weight five meters in 4 seconds. How much power have you generated?

• 160 watts

• 10 watts

• 6.4 watts

• 17 watts

Multiple Choice

Work divided by time equals...

• energy

• power

Multiple Choice

The unit of work is the ...

• joule

• force

Multiple Choice

The unit of power is the...

• work

• watt

Multiple Choice

Force multiplied by distance equals...

• work

• power

Multiple Choice

Work is done on an object when the object moves in the SAME direction in which the force is applied.

• True

• False

Multiple Choice

The FARTHER you move an object, the more work you do.

• True

• False

Multiple Choice

The more POWER you use to move an object, the more work you do. 

• True

• False

Multiple Choice

Power is the RATE at which work is done. 

• True

• False

Multiple Choice

Newtons are the correct unit for which of the following?

• Force

• Work

• Power

• Acceleration

Multiple Choice

In order to do work on an object, the force you exert must be...

• The maximum amount of force you are able to exert.

• In the same direction as the object's motion.

• In a direction opposite to Earth's gravitational force.

• quick and deliberate.

Multiple Choice

How do we calculate work?

• W = F * d

• w = f / d

Multiple Choice

Which is the correct unit for work?

• Joules

• Newton

• meter

• Watts

Multiple Choice

How do you calculate power?

• P = W/t

• P = E/t

• P = w * t

• P = bbq/chicken

Multiple Choice

What is the correct unit for power?

• Watt

• Joules

• Newtons

• seconds

Multiple Choice

It took 500 Newtons of force to push a car four meters. How much work was done?

• 2000 J

• 125 J

• 0.008 J

• 500 J

Multiple Choice

1. A book weighing 1.0 newton is lifted 2 meters.  How much work was done?

• 2 J

• 0.5 J

Multiple Choice

A force of 15 newtons is used to push a box along the floor a distance of 3 meters.  How much work was done?

• 3 J

• 45 J

Multiple Choice

It took 500 newtons of force to push a car 4 meters.  How much work was done?

• 2,000 J
• 125 J

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

A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?

• 16.67 watts

• 50 watts

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 5 seconds?

• 70 watts

• 1750 watts