Work and Power

Two factors that determine work are...

• Force

• Mass

• Velocity

• Distance

If the object does not move then what is happening

• nothing

• work

• power

• no work is being done on the object

The ( ) the force the ( ) work is done

• less, more

• smaller, more

• bigger, more

• bigger, less

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

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

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter

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

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

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

• 30 watts
• 3 watts
• 120 watts
• 270 watts

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

• 2.23 W

• 6.03 W

• 17.4 W

• 278.7 W