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- 1. Multiple Choice
Four forces namely gravitational force, normal force, frictional force, and driving force act on a wheel. The direction of the frictional force and driving force are as shown in the figure.
Which force that exerts a turning effect about the axle?
Gravitational force
Normal force
Frictional force
Driving force
- 2. Multiple Choice
The frictional force acting on the wheel is 24 N and the diameter of the wheel is 80 cm.
What is the moment caused by the frictional force on the wheel?
9.6 Nm, clockwise
9.6 Nm, anti-clockwise
19.2 Nm, clockwise
19.2 Nm, anti-clockwise
- 3. Multiple Choice
Charlie and his dad are sitting on a seesaw as shown in the figure.
Given Charlie's weight is 300 N and he sits 2.0 m away from the fixed point, what is the moment of force generated by Charlie?
150 Nm, clockwise
150 Nm, anti-clockwise
300 Nm, clockwise
600 Nm, anti-clockwise
- 4. Multiple Choice
Charlie and his dad are sitting on a seesaw as shown in the figure.
Given Charlie's dad's weight is 600 N and he sits 1.5 m away from the fixed point, what is the moment of force generated by Charlie's dad?
400 Nm, clockwise
600 Nm, anti-clockwise
900 Nm, clockwise
900 Nm, anti-clockwise
- 5. Multiple Choice
Charlie's weight is 300 N and he sits 2.0 away from the left side of the fixed point. Charlie's dad's weight is 600 N and he sits 1.5 m away from the right side of the fixed point.
What is the total moment of force experienced by the seesaw?
300 Nm, clockwise
900 Nm, anti-clockwise
900 Nm, clockwise
1200 Nm, anti-clockwise
- 6. Multiple Choice
Which factor is NOT the criterion of a couple?
Forces with the same magnitude.
Forces in the opposite direction.
Forces acting on the pivot.
Forces with no intersection of their action line.
- 7. Multiple Choice
Which statement is correct due to the definition of torque of a couple?
The product of one of the forces and perpendicular distance to the pivot.
The product of one of the forces and the perpendicular distance between the forces.
The product of the moment of force and perpendicular distance to the pivot.
The product of one of the moment of force and the perpendicular distance between the forces.
- 8. Multiple Choice
Given the magnitude of force F is 30 N and the distance s is 25 cm, what is the torque produced by on the circle?
7.5 Nm, clockwise
15 Nm, clockwise
15 Nm, anti-clockwise
750 Nm, anti-clockwise
- 9. Multiple Choice
Which pair of forces is a couple?
F1 and F4
F2 and F3
F3 and F6
F5 and F6
- 10. Multiple Choice
What is the torque exerted by the couple of 10 N forces to the square?
0.8 Nm, clockwise
0.8 Nm, anti-clockwise
8.0 Nm, anti-clockwise
80 Nm, clockwise
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