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 Form 3 Physics Newton's laws of motion questions and answers

(a) State newton’s first law of motion.
(b) A wooden block resting on a horizontal bench is given an initial velocity, u, so that it slides on the bench surface for a distance, n, before
coming to stop. The values of d were measured and recorded for various values of initial velocity.
Figure 10 shows the graph of u2 against d.
fignewton5620201523.JPG
(i) Determine the slope, s, of the graph.
(ii) Given that u2= 20kd, where k is constant for the bench surface, determine the value of k from the graph.
(iii) State how the value k would be affected by a change in the roughness of the bench surface.
(c) A car of mass 800kg starts from rest and accelerates at 1.2 ms-2. Determine its momentum after it has moved 400m from the starting point.

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