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WorksheetsPhysics Work Energy Power
Total questions: 15
Worksheet time: 15mins
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
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
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.
If you push as hard you can on an object, what are you putting onto it?
distance
work
force
time
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
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?
19.6J
2J
4J
0.8J
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?
2.28m
1.28m
1m
9.8m
Energy is ....
Weird
Destroyed during explosions
Conserved
Created under the right circumstances
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.
The beam has less energy when landing on the ground than it started with due to losing some to its surroundings
The beam has the same amount of energy as it began with
The kinetic energy as the beam touches the ground is equal to the potential energy it began with.
The beam has a velocity of 19.8 m/s as it reaches the ground
What is the work done when a force of 10 N moves an object 5 meters in the direction of the force?
10 J
50 J
5 J
15 J
A 2 kg object is lifted to a height of 10 meters. What is the potential energy of the object at this height? (Assume g = 9.8 m/s^2)
98 J
196 J
20 J
9.8 J
Which of the following statements is true about power?
Power is the rate of doing work
Power is the total energy consumed
Power is the force applied over a distance
Power is the energy stored in an object
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?
2000 W
4000 W
10000 W
20000 W
