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WorksheetsForm 3 Chapter 7
Total questions: 15
Worksheet time: 4hrs 45mins
What is the definition of work done, W?
Product of force, F and displacement, s, W=Fs.
Energy required to move 1N weight of object by 1m, W=Fs.
Product of force, F and displacement, s, in the direction of force. W=Fs.
Mechanical energy required to move 1kg mass of object using 1N of force by 1m in the direction of force. W=Fs
A gymnast lifted a 10kg barbell with plates of 20kg on each side from the ground to 2m height. What is the work done by the gymnast? [taking g=10ms-2]
100 J
1000 J
800 J
80 J
Nathasha pull the box with force of 10N with at angle of 60o from the ground, the box moved with displacement of 2m to the right. Calculate the work done?
10 J
20 J
30 J
0 J
100N force was applied a box with mass of 15kg. If the box moves 5m to the right, what is the work done. [Taking g=10 ms-2]
750 Nm
500 Nm
75 Nm
5000 Nm
The power of a normal person’s heart for blood circulation is 1.5W, What is the work done by heart in one day?
1296 kJ
1296 J
0.017 J
1500 kJ
The weightlifter lifted a 150kg barbell upward by 2m at a constant speed in 2s and stayed in the air for 3s. Calculate the work done on the barbell and the average power within this 5s. [Take g as 10ms-2]
W= 3000J ; Pavg= 600 W
W= 300J ; Pavg= 60 W
W= 3000J ; Pavg= 1500 W
W= 300J ; Pavg= 150 W
Which of the following object possess kinetic energy?
Compressed spring
Car parked at the sideway
A moving sampan
Object hanging stationary on the wall
Based on the diagram, a 'bird' was climbing up the stair with constant velocity of 2ms-1. Which of the following statement is correct?
Gravitational potential energy increases, Kinetic energy decreases
Gravitational potential energy increases, Kinetic energy remains the same.
Gravitational potential energy increases, Kinetic energy increases.
Gravitational potential energy and kinetic energy remains the same
What is the Principle of Conservation of Energy?
Energy cannot be created nor destroyed but can only converted from one form to another.
Energy cannot be created nor destroyed and cannot be converted from one form to another.
Energy can be created or destroyed but cannot be converted from one form to another.
Energy can be created or destroyed and can be converted from one form to another.
Based on the diagram, explain why the pendulum bob will not hit the professor?
At which position does the pendulum bob has the highest kinetic energy and gravitational potential energy?
Max Ek : When it reaches the normal line (minimum angle θ=0)
Max Ep : When it reaches the maximum angle of θ
Max Ek : When it reaches the maximum angle of θ
Max Ep : When it reaches the normal line (minimum angle θ=0)
A pendulum bob of mass 2kg is fixed from the ceiling by a string with length of 1m. If the bob is pulled by 0.75m to one side, what is the potential energy with respect to its equilibrium position? [Taking g as 9.81 ms-2]
6.6 J
3.3 J
2.2 J
12.2 J
An archer used 200N to pull the bow from its equilibrium position to the extension of 1m. What will be the elastic potential energy stored on the bowstring? If all the energy was transferred to the arrow with mass of 0.1kg, what will be the maximum velocity the arrow can reached?
Elastic potential energy= 200J ; vmax= 63.2 ms-1
Elastic potential energy= 100J ; vmax= 31.6 ms-1
Elastic potential energy= 100J ; vmax= 44.7 ms-1
Elastic potential energy= 200J ; vmax= 40.0 ms-1
A man with mass of 120kg was standing 150m above the ground. Taking g=10 ms-2 and the ground as reference point. Calculate the gravitational potential energy the man possess and its kinetic energy when it hit the ground (Assuming all Ep converted to Ek)
Ep = 180 kJ , Ek = 180 kJ
Ep = 18 kJ , Ek = 18 kJ
Ep = 180 kJ , Ek = 90 kJ
Ep = 18 kJ , Ek = 9 kJ
A man threw a ball upward with initial velocity of 10ms-1. What will be the maximum height the ball can reached? [Taking g as 10 ms-2]
5m
10m
15m
20m
