Physics Work

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

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task

• Work takes into account the time it takes to complete a task

• Power is force/area

• Work is force/area

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

You do work against gravity when you walk up some stairs.

• True

• False

Mike and Ian move 50 m on a snow lift which uses 750 N of force to move them in 75 seconds. Calculate the power of the lift.

• 750 W

• 500 W

• 7500 W

• 2812500 W

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NGSS.MS-PS2-2

NGSS.MS-PS3-5

Ian and Steve ski down the 75 m slope in 80 seconds using 400 N of penguin force. Calculate their penguin power!

• 375 W

• 37.5 W

• 426.7 W

• 240 000W

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Mike and Peter are climbing to the top. Both take the same time, do the same route, but Mike has a mass of 25 kg while Peter has a mass of 30 kg. (He is a bit taller). Which penguin does the most work and why.

• Mike as shorter people have shorter legs and does more work.

• Peter as he does more work over the same time than Mike because he has a bigger weight force

• Mike and Peter do the same amount of work as they do the same route in the same time.

• Peter as he does the same amount of work but in a smaller amount of time.

Tags

NGSS.MS-PS2-2

If you push as hard you can on an object, what are you putting onto it?

• distance

• work

• force

• time

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A roller coaster goes over a 10m high hill at 20m/s. What kind of energy does the roller coaster have?

• Potential

• Kinetic

• Both

• Neither

Which is a valid set of units for energy

• kgN

• Nm²/s²

• w

• kgm²/s²

2 identical bowling balls are dropped from the side of a cliff. Bowling ball B is dropped from twice as high than bowling ball A. How many times more kinetic energy does bowling ball B have?

• 2

• Square Root (2)

• Same amount

• 1/2

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5