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VICPhysicsQuick questions

Unit 2: How does physics help us to understand the world?

Quick questions on Friction and inclined planes (VCE Physics Unit 2)

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is static friction?
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Opposes motion that would otherwise begin. fs≤μsNf_s \le \mu_s N. The inequality reflects that static friction takes whatever value is needed to keep the object stationary, up to the threshold.
What is kinetic friction?
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Acts on a moving object opposing motion. fk=μkNf_k = \mu_k N. Constant magnitude (independent of speed, to a good approximation).
What is frictionless ramp?
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Net force along slope = mgsin⁡θmg \sin\theta. Acceleration a=gsin⁡θa = g \sin\theta.
What is q1?
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State the difference between static and kinetic friction. [2 marks]
What is q2?
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A 1010 kg box rests on a 30∘30^\circ ramp with μs=0.4\mu_s = 0.4. Determine (a) whether the box slides, and (b) if not, the friction force required to hold it. [4 marks]
What is q3?
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Refer to the West Gate truck descent. (a) Calculate the slope-parallel weight component. (b) Determine the maximum kinetic-friction force on the tyres.

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