ExpertEasy1 markMultiple Choice
AQA GCSE · Question 03.1 · Forces
A student investigated how changing the mass of a trolley affects the acceleration of the trolley. Figure 5 shows some of the equipment used. The trolley in Figure 5 is not moving. Which force prevents the trolley from moving?
A student investigated how changing the mass of a trolley affects the acceleration of the trolley. Figure 5 shows some of the equipment used. The trolley in Figure 5 is not moving. Which force prevents the trolley from moving?
Answer options:
A.
Friction
B.
Tension
C.
Weight
How to approach this question
Consider the forces acting on the trolley. The mass hanger provides a pulling force (tension). The trolley is not moving, so there must be a force acting in the opposite direction to balance the tension. Identify this opposing force.
Full Answer
A.Friction✓ Correct
Friction
The mass hanger pulls the trolley to the right via the tension in the string. Since the trolley is stationary, the net force on it is zero. This means there must be another horizontal force acting to the left that is equal in size to the tension. This opposing force is friction, which acts between the wheels and axles of the trolley and the surface of the bench.
Common mistakes
✗ Choosing tension, which is the force causing the potential motion, not preventing it.\n✗ Choosing weight, which is a vertical force, while the motion being prevented is horizontal.
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