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VICPhysicsQuick questions

Unit 3: How do fields explain motion and electricity?

Quick questions on Newton's laws, momentum and impulse: VCE Physics Unit 3

8short 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 are newton's three laws?
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First law (inertia). An object continues at rest or in uniform straight-line motion unless acted on by a net external force.
What is conservation of momentum?
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In an isolated system (no net external force), total momentum is conserved:
What is first law?
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An object continues at rest or in uniform straight-line motion unless acted on by a net external force.
What is second law?
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The net force on an object equals its mass times its acceleration: Fnet=maF_{net} = ma. In two dimensions, resolve forces along perpendicular axes and apply Fnet=maF_{net} = ma on each axis independently.
What is third law?
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When object A exerts a force on object B, object B exerts an equal and opposite force on A. The two forces act on different objects, so they never cancel on a single free-body diagram.
What is q1?
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State Newton's three laws of motion in one sentence each. [3 marks]
What is q2?
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A 0.40.4 kg ball moving east at 2525 m s−1^{-1} rebounds west at 2020 m s−1^{-1} after striking a bat. Calculate (a) the change in momentum, and (b) the average force if contact lasts 0.0050.005 s. [4 marks]
What is q3?
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Refer to the Spencer Street collision. (a) Calculate the post-collision velocity. (b) Determine the impulse on the truck.

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