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1.5 Forces continued
1.5.2 Friction
1 Describe friction as a force that may impede motion and produce heating
2 Understand the motion of objects acted on by a constant weight or driving force, with and without drag (including air resistance or resistance in a liquid)
3 Explain how an object reaches terminal velocity
4 Define the thinking distance, braking distance and stopping distance of a moving vehicle
5 Explain the factors that affect thinking and braking distance including speed, tiredness, alcohol, drugs, load, tyre surface and road conditions
1.5.3 Elastic deformation
1 Know that forces may produce a change in size and shape of an object
2 Define the spring constant as force per unit extension; recall and use the equation
spring constant = force extension
k = Fx
3 Sketch, plot and interpret load–extension graphs for an elastic solid and describe the associated
