Quiz about AP Physics 1 work and Power

Question 1

In which of the following situations do your arms do work on books?

Accepted Answer

picking up a pile of books from the floor

Answer

holding a heavy stack of books while standing

Answer

carrying a heavy stack of books

Answer

dropping a stack of books onto a table

Question 2

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

Accepted Answer

0 J

Answer

15 J

Answer

45 J

Answer

5 J

Question 3

What unit do we use for measuring power?

Accepted Answer

Watts

Answer

Joules

Answer

Newtons

Answer

ft/lbs

Question 4

What is the difference between calculating power and work?

Accepted Answer

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

Answer

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

Answer

Power is force/area

Answer

Work is force/area

Question 5

Mr. B's and Mr. P's classes competed in a game of tug of war. Mr. B's class pulled to the right with a force of 4,000 N. Mr. P's class pulled to the left with a force of 5,000 N. As a result the rope moved 5.1 m to the left. How much work was done by the net force?

Accepted Answer

5100 J

Answer

4100 J

Answer

3100 J

Answer

45900 J

Question 6

How much work is done carrying a 10-N box horizontally across a floor for 8 m?

Accepted Answer

0 J

Answer

80 J

Answer

10 J

Answer

8 J

Question 7

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

Accepted Answer

True

Answer

False

Question 8

How are work and energy related?

Accepted Answer

The work done by an external force acting on an object causes a change in the mechanical energy of the object.

Answer

Work is the same thing as energy.  They are equal.

Answer

Energy is m*g*h, and work is 1/2*m*v²

Question 9

If you pull the trolley along a flat floor horizontally. Which force do you use to calculate the work done.

Accepted Answer

Pulling force

Answer

Weight

Question 10

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.

Accepted Answer

500 W

Answer

750 W

Answer

7500 W

Answer

2812500 W

Question 11

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

Accepted Answer

375 W

Answer

37.5 W

Answer

426.7 W

Answer

240 000W

Question 12

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.

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 13

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

Accepted Answer

force

Answer

distance

Answer

work

Answer

time

Question 14

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

Accepted Answer

Both

Answer

Potential

Answer

Kinetic

Answer

Neither

Question 15

Humpty Dumpty sat on a wall. Humpty Dumpty had a great fall. What is the speed of Humpty Dumpty right before he hits the ground?

Accepted Answer

v= Square root (2gh)

Answer

v= mgh

Answer

v=square root (mgh)

Answer

v= 1/2mk2

Question 16

Which is a valid set of units for energy

Accepted Answer

kgm2/s2

Answer

kgN

Answer

Nm2/s2

Answer

w

Question 17

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?

Accepted Answer

Square Root (2)

Answer

2

Answer

Same amount

Answer

1/2

Question 18

You are playing kickball in gym. You kick the 0.5kg ball with enough force to cause it to travel at 4m/s. How much energy would the ball have at the peak of its movements?

Accepted Answer

4J

Answer

19.6J

Answer

2J

Answer

0.8J

Question 19

You 80kg and your date 65kg decide to go to the park. The two of you decide to see who can get the highest on the swings. At the bottom of your swing you are 1m above the ground and are traveling 5m/s. How high is your peak in the swing?

Accepted Answer

2.28m

Answer

1.28m

Answer

1m

Answer

9.8m

Question 20

Energy is ....

Accepted Answer

Conserved

Answer

Weird

Answer

Destroyed during explosions

Answer

Created under the right circumstances

Question 21

Use the law of conservation of energy (assume no friction) to find "E" for a 500-kg roller coaster following this path.

Accepted Answer

31.6 m/s

Answer

51.0 m/s

Answer

40.8 m/s

Answer

28.3 m/s

Question 22

A crane lifts a steel beam weighing 8,000N, 300m in the air, then drops it onto a 20m high building below (for science!). The steel beam breaks through the ceiling. Assume that air resistance is negligible. Select the statement that best describes the scenario above.

Accepted Answer

The beam has less energy when landing on the ground than it started with due to losing some to its surroundings

Answer

The beam has the same amount of energy as it began with

Answer

The kinetic energy as the beam touches the ground is equal to the potential energy it began with.

Answer

The beam has a velocity of 19.8 m/s as it reaches the ground

Question 23

Rank the scenarios from least to greatest kinetic energy right before they hit the ground

Accepted Answer

2<1<3=4

Answer

2<3<1<4

Answer

2<1<3<4

Answer

1=2=3=4

Question 24

The space shuttle (RIP) used to be transported to its launch pad by a large mobile platform. If the platform holds up the space shuttle 4.5x10⁶kg while rolling 800m to the launch pad, how much work does it do in holding up the shuttle?

Accepted Answer

0 J

Answer

More than 0 but less than 1x10⁵ J

Answer

More than 1x10⁵J but less than 1x10⁷J

Answer

More than 1x10⁷ J but less than 1x10⁹ J

Answer

More than 1x10⁹ J

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