A car of mass 800 kg is travelling at a speed of 25m/s along a straight, horizontal road.
(a) State how velocity differs from speed.
(b) The driver presses the accelerator and the speed of the car starts to increase from 25 m/s.
The car accelerates at 1.5m/s2
(i) Calculate the resultant force acting on the car as it accelerates.
(ii) Explain why the forward force acting on the car due to the engine is greater than the
value in (b)(i).
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Answer:
a) Velocity is a vector quantity and depends upon both the magnitude and direction. Speed is a scalar quantity only depending upon the magnitude.
b) Force = mass x acceleration
= 800 x 1.5
= 1200 N
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