Forces 1

Sifat Symum
Mind Map by Sifat Symum, updated more than 1 year ago
Sifat Symum
Created by Sifat Symum over 3 years ago
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Following GCSE AQA syllabus: 4.5 - 4.5.4

Resource summary

Forces 1
1 Quantities
1.1 Scalar
1.1.1 Scalar quantities only have magnitude (size)
1.2 Vector
1.2.1 Vector quantities have both magnitude and direction
1.2.2 These can be represented by arrows
1.2.2.1 Length of arrow determines magnitude
1.2.2.2 Direction of arrow represents direction
2 Contact and Non-contact forces
2.1 A force is a push or pull that acts on an object due to the interaction with another object
2.2 contact forces – the objects are physically touching
2.2.1 Friction
2.2.2 Air resistance
2.3 non-contact forces – the objects are physically separated
2.3.1 Gravitational force
2.3.2 Magnetic Force
3 Weight and Gravity
3.1 Weight = mass x Gravity
3.1.1 W = mg
3.1.1.1 Weight, W, in Newtons, N
3.1.1.2 mass, m, in kilograms, kg
3.1.1.3 gravitational field strength, g, in N/kg
3.2 The weight of an object is directly proportional to mass
3.2.1 Mass is how much matter is contained within a body.
3.2.1.1 Mass remains constant regardless of gravity
3.2.2 Weight is the force of gravity acting upon a mass
3.2.2.1 The weight changes according to the gravitational field strength
3.3 Weight is measured using a Newtonmeter
4 Work done and Energy Transfer
4.1 A resultant force is the overall representation of all of the forces acting upon a body
4.1.1 It is a single force that has the same effect of multiple forces combined
4.2 Work done = Force x distance
4.2.1 W = F x s
4.2.1.1 Work done, W, in joules, J
4.2.1.2 distance, s, in metres
4.2.1.3 Force, F, in newtons, N
4.3 One joule of work is done when a force of one newton causes a displacement of one metre
4.3.1 1 joule = 1 newton-metre
5 Forces and Elasticity
5.1 Deformation
5.1.1 This means to change an object's shape
5.2 force = spring constant x extension
5.2.1 F = k x e
5.2.1.1 Force, F, in newtons, N
5.2.1.2 spring constant, k, in newtons per metre, N/m
5.2.1.3 extension, e, in metres, m
5.2.2 This relationship also applies to the compression of an elastic object, where ‘e’ would be the compression of the object
5.3 When a force stretches or compresses a spring work is done
5.3.1 Elastic potential energy is then stored
5.3.1.1 Provided the spring is not deformed...
5.3.1.1.1 The work done on the spring and stored elastic potential energy will be equal
6 Moments
6.1 Moment = Force × distance
6.1.1 M = F x d
6.1.1.1 moment of a force, M, in newton-metres, Nm
6.1.1.2 force, F, in newtons, N
6.1.1.3 distance, d, in metres, m
6.1.1.3.1 This is is the perpendicular distance from the pivot to the line of action of the force
6.2 If an object is balanced, the total clockwise moment about a pivot equals the total anticlockwise moment about that pivot
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