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# 90940mechanics2012

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### 90940mechanics2012

1. 1. You may find the following formulae usefulv = Δd Δt a = Δv Δt F net = ma P= F A 1 WΔE p = mgΔh E k = 2 mv2 W = Fd P= tRead the Questions and enter your answers withworking on the answer scheduleQuestion 1 a,b and c The TractorA woman drives her tractor down a sandy beach to pick up her friend’s boat. Thedistance-time graph below shows part of the journey.Go to the answer schedule andtackle the questions about this graph (1a,b and c)
2. 2. Question 1d The tractorWhile on the sandy beach the woman sees a car (m = 1100 kg) that is stuck in thesand.The photos below show the tread patterns of the tractor’s rear tyre and the car’s reartyre. Use these pictures to help you answer the questions on the answer schedule.
3. 3. QUESTION TWO: 100 METRE RACEOn athletics day, two friends compete in the same 100 metre race. The speed-timegraphs for 12 seconds of their race are shown below. The questions on the answerschedule are based on this graph
4. 4. Question 3:CratersSome students wanted to investigate how craters form.They dropped two different balls – a golf ball (m = 0.046 kg) and a table-tennis ball (m= 0.003 kg), from a height of 2 m into a container filled with flour.Use this information to answer the questions on the answer schedule