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# Year 8 - Unit 5

### Forces

What is a Force? A Force is a push or pull.
What does the term 'balanced forces' mean? The net force equals zero. Therefore the objects motion is not affected.
What does the term 'unbalanced forces' mean? The net force is not zero. Therefore the objects will accelerate (or decelerate).
Which of the following forces are 'contact forces'? Friction, Weight, Air Resistance, Magnetism, Applied force (push), Electrical , Spring force, Tension , Upthrust/Trust The contact forces are: Friction, Tension (Pull), Air Resistance , Applied Force (Push) , Spring Force (Twist), Upthrust/Thrust
What are the three effects forces can have on an object? Squash, Stretch and Move
What is the resultant force? 15N <--- O -> 5N 10N to the left
What is the resultant force? 150N <--- O -> 50N 100N to the left
What is the resultant force? 25N <- O ----> 100N 75N to the right
What is the resultant force? 30N <-- O ----> 80N 50N to the right
What happens if an object is stretched too far? It deforms inelestically (it breaks and can no longer return to it's original shape)
Weight = _________ x __________? Weight = mass x gravitational field strength
What is the SI unit for Force? Newtons, N
What is weight? Weight is a force due to gravity.
What is mass? Mass is the amount of matter ('stuff') which an object is made up from.
Created by: nashl