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# 7 k forces and their effects (whs)

## on Mar 29, 2014

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## 7 k forces and their effects (whs)Presentation Transcript

• 29/03/14 Forces and their effectsForces and their effects W Richards Worthing High School Please note – some of the animation effects used here only work in PP XP
• 29/03/14 What is a force?What is a force? A force is a “push” or a “pull”. Some common examples: ________ – pulls things downwards ___ ________ (drag) – acts against anything moving through air ______ – keeps things afloat _____ – acts against anything moving Words – upthrust, air resistance, friction, weight
• 29/03/14 Balanced and unbalanced forcesBalanced and unbalanced forces Consider a camel standing on a road. What forces are acting on it? Weight Reaction These two forces would be equal – we say that they are BALANCED. The camel doesn’t move anywhere.
• 29/03/14 Balanced and unbalanced forcesBalanced and unbalanced forces What would happen if we took the road away? Weight Reaction
• 29/03/14 Balanced and unbalanced forcesBalanced and unbalanced forces 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
• 29/03/14 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 forcesBalanced and unbalanced forces
• 29/03/14 Balanced and unbalanced forcesBalanced and unbalanced forces 1) This animal is either ________ or moving with _______ _____… 4) This animal is also either _______ or moving with ________ ______.. 2) This animal is getting ________… 3) This animal is getting _______…. Words - Stationary, faster, slower or constant speed?
• 29/03/14 Weight and MassWeight and Mass 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
• 29/03/14 FloatingFloating 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
• 29/03/14 FrictionFriction 1) What is friction? 2) Give 3 examples where it is annoying: 1) Give 3 examples where it is useful: 1) What effect does friction have on the surfaces?
• 29/03/14 Stopping a car…Stopping a car… Braking distance Too much alcohol Thinking distance Tiredness Too many drugs Wet roads Driving too fast Tyres/brakes worn out Icy roads Poor visibility
• 29/03/14 Distance-time graphsDistance-time graphs 40 30 20 10 0 20 40 60 80 100 4) Diagonal line downwards = 3) Steeper diagonal line =1) Diagonal line = 2) Horizontal line = Distance (metres) Time/s
• 29/03/14 40 30 20 10 0 20 40 60 80 100 1) How far had the object gone after 20 seconds? 2) How far had the object gone after 60 seconds? 3) When is the object standing still? 4) When was the object travelling the fastest? Distance (metres) Time/s