WorksheetsEnergy and power
Total questions: 8
Worksheet time: 21mins
Which of the follwing shows work done?
Pushing a wall
Sitting on the floor
Rowing a boat
Reading a book in the class
Table1 shows the mass of four different loads which are being pushed in a trolley over a distance of 5m. Which of the following statement is correct?
The work done by the trolley for load P is the biggest
The work done by the trolley for load R is the smallest
The work done by the trolley for load S is greater than load Q
The work done by the trolley for load Q is smaller for load P
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
Table 2 shows the mass of four students who are asked to carry loads of different mass up a flight of stairs with a height of 5m. Who does the most work
Ali
Abu
Azman
Akil
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
