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QLDPhysicsQuick questions
Unit 2: Linear motion and waves
Quick questions on Newton's laws and forces (QCE 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 first law?Show answer
An object continues in a state of rest or uniform motion in a straight line unless a net external force acts on it. A net force of zero means constant velocity (which includes being at rest).
What is second law?Show answer
The net force on an object equals its mass times acceleration:
What is third law?Show answer
For every action there is an equal and opposite reaction. If body A exerts a force on body B, then body B exerts a force of equal magnitude and opposite direction on body A. The forces act on different bodies and never on the same body, which is why a third-law pair does not "cancel out" the way two opposing forces on one body do.
What is q1?Show answer
State Newton's third law and give one example. [2 marks]
What is q2?Show answer
A block on a horizontal surface () is pulled with horizontal. Calculate the friction force, the net force and the acceleration. [4 marks]
What is q3?Show answer
A car ascends a incline at constant velocity. (a) Draw the free-body diagram. (b) Calculate the driving force and the normal reaction.
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