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WorksheetsScience Form 3: Chapter 7: Energy and Power
Total questions: 22
Worksheet time: 4hrs 40mins
The roller coaster car has a mass of 500 kg. It is pulled from position 1 to 2 (30 m) by a motor. At the top of the ride the vertical distance top to bottom is 20 m. The motor pulls the car with a 4000 N force. Calculate the work done getting the car to the top of the ride.
100 000J
120 000J
800 000J
90 000J
The ability to do work or cause change:
work
energy
momentum
power
Kinetic energy is associated with ---.
speed
position
direction
temperature
The SI Unit for Energy is
Joule
Newton
Calorie
Watt
A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?
200 J
80 J
5 J
2000 J
A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?
18 m
4 m
10 m
6 m
Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?
100 watts
400 watts
104 watts
50 watts
Energy is
Whether one feels like doing work
the ability to do work
calculated by dividing the amount of work by the amount of time to do the work
just another word for work
Diagram 3 shows a sack of rice being pushed over a distance of 5m. Calculate the work done( assume the gravitational force 10 N kg-1
6 J
60 J
150 J
1500 J
Diagram 2 shows Mary is rowing a boat. Calculate the distance travelled by the boat if the work done is 1500J
0.02 m
30m
1450 m
75000m
The work done by Ali to push a trolley for a distance of 30m is 600 J. calculate the force applied
0.05 N
20 N
570 N
18000N
A stuntman with a mass of 60kg had climbed up the roof of a building which is 50m tall. If the power used for this stunt is 6000W, calculate the time taken by the stuntman to complete this stunt. (assume gravitational force = 10N kg-1)
0.5 s
1.2 s
2s
5s
Diagram 3 shows an activity done by Mazlan. A 200 N weight is lifted by Mazlan to a height 1.5m in 3 second. Calculate the power needed to lift the object
100 W
300 W
600 W
900 W
