Forces and their effects

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GCSE Forces and Motion W Richards Worthing High School

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Presentation transcript:

Forces and their effects 06/11/2017 Forces and their effects

Words – upthrust, air resistance, friction, weight What is a force? 06/11/2017 A force is a “push” or a “pull”. Some common examples: ___ ________ (drag) – acts against anything moving through air ________ – pulls things downwards _____ – acts against anything moving ______ – keeps things afloat Words – upthrust, air resistance, friction, weight

Balanced and unbalanced forces 06/11/2017 Reaction Consider a camel standing on a road. What forces are acting on it? These two forces would be equal – we say that they are BALANCED. The camel doesn’t move anywhere. Weight

Balanced and unbalanced forces 06/11/2017 Reaction What would happen if we took the road away? Weight

Balanced and unbalanced forces 06/11/2017 What would happen if we took the road away? The camel’s weight is no longer balanced by anything, so the camel falls downwards… Weight

Balanced and unbalanced forces 06/11/2017 What would happen if we took the road away? The camel’s weight is no longer balanced by anything, so the camel falls downwards…

Balanced and unbalanced forces 06/11/2017 1) This animal is either ________ or moving with _______ _____… 2) This animal is getting ________… 3) This animal is getting _______…. 4) This animal is also either _______ or moving with ________ ______.. Words - Stationary, faster, slower or constant speed?

Weight and Mass 06/11/2017 The MASS of an object is a measure of how much “stuff” it contains”. The WEIGHT of an object is the amount of force that pulls it downwards due to gravity. 1 Kg This object has a MASS of 1Kg… …and a WEIGHT of 10N

Floating 06/11/2017 Whether or not an object will float depends on its DENSITY. For example: The metal block will ____ because it is ______ dense than water The wooden block will ____ because it is ______ dense than water

Friction What is friction? Give 3 examples where it is annoying: 06/11/2017 What is friction? Give 3 examples where it is annoying: Give 3 examples where it is useful: What effect does friction have on the surfaces?

Stopping a car… Tiredness Too much alcohol Thinking distance 06/11/2017 Tiredness Too much alcohol Thinking distance Too many drugs Poor visibility Wet roads Icy roads Braking distance Tyres/brakes worn out Driving too fast

Distance-time graphs 2) Horizontal line = 40 30 20 10 06/11/2017 2) Horizontal line = 40 30 20 10 4) Diagonal line downwards = Distance (metres) 3) Steeper diagonal line = Time/s Diagonal line = 20 40 60 80 100

40 30 20 10 20 40 60 80 100 Distance (metres) Time/s 06/11/2017 Distance (metres) Time/s 20 40 60 80 100 How far had the object gone after 20 seconds? How far had the object gone after 60 seconds? When is the object standing still? When was the object travelling the fastest?