Quiz about Physics Work Energy Power

Question 1

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 2

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 3

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 4

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 5

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 6

Which is a valid set of units for energy

Accepted Answer

kgm2/s2

Answer

kgN

Answer

Nm2/s2

Answer

w

Question 7

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 8

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 9

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 10

Energy is ....

Accepted Answer

Conserved

Answer

Weird

Answer

Destroyed during explosions

Answer

Created under the right circumstances

Question 11

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 12

What is the work done when a force of 10 N moves an object 5 meters in the direction of the force?

Accepted Answer

50 J

Answer

10 J

Answer

5 J

Answer

15 J

Question 13

Which of the following statements is true about power?

Accepted Answer

Power is the rate of doing work

Answer

Power is the total energy consumed

Answer

Power is the force applied over a distance

Answer

Power is the energy stored in an object

Question 14

A car accelerates from rest to a speed of 20 m/s in 10 seconds. What is the average power output of the car's engine if the car's mass is 1000 kg?

Accepted Answer

10000 W

Answer

2000 W

Answer

4000 W

Answer

20000 W

Physics Work Energy Power

15 questions