Grade 12 Physical Sciences · Mechanics
Explain using impulse and momentum
Explain how a longer contact time lowers the force for the same change in momentum, for example how airbags protect drivers.
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Question 4.4 · May/June 2025 · Paper 1 · National (DBE) · 2 marks
Trolley A of mass kg is at rest on a frictionless horizontal surface. A second trolley B, of mass kg, travelling horizontally at a constant speed v, collides with trolley A. The trolleys stick together and move at a constant velocity to the right, covering a distance of m in s. See the diagram below.
Ignore ALL frictional and rotational effects.
Ignore ALL frictional and rotational effects.
4.4 During another collision, trolley B exerts a greater force on trolley A and the change in momentum of trolley A is the same as before. How is the time for the collision affected?
Choose from INCREASES, DECREASES or REMAINS THE SAME.
Write down a relevant equation that supports the answer.(2)
Choose from INCREASES, DECREASES or REMAINS THE SAME.
Write down a relevant equation that supports the answer.(2)
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