7K forces 5.0 / 5 based on 1 rating ? ScienceForcesYears 7-9 (KS3)None Created by: MaeGetsRevisingCreated on: 27-06-20 15:43 What can forces do? Change the shape or size of an object 1 of 9 What is friction caused by? Two things rubbing together 2 of 9 Upwards forces from water or air are called what? Upthrust 3 of 9 Contact forces only act when... two objects or materials are touching 4 of 9 The extension of a spring is ______ to the force on it proportional 5 of 9 The extension of a spring is proportional to the force on it. What is this called? Hooke's law 6 of 9 If the spring is stretched too far - the extension stops being proportional to the force. 7 of 9 When a spring goes past its elastic limit, what happens? the spring will no longer return to its original length when the force is removed. 8 of 9 What is the formula for working out pressure? pressure = force ÷ area 9 of 9
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