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Physics Chapter 3 Summary- Forces by Mind Map: Physics Chapter 3 Summary- Forces
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Physics Chapter 3 Summary- Forces

Forces work in pairs

1st and 3rd

2nd and 3rd

NEVER 1st and 2nd

Newton's 1st Law

1) An object at rest would remain at rest

2) An object in motion will continue to be in motion at a constant speed in a straight line

3) In the absence of a resulting force acting on it

In this law, the forces are balanced

For example..., A rock on a table, The rock's weight is pushing down on the table, The table's reaction force pushes it back (3rd law),


A falling object would reach a point where Air resistance = Weight, This is called terminal velocity, Resultant Force = 0N, No resultant force ≠ No force, All force are balanced

Newton's 2nd Law

The resultant forces acting upon an object is equal to the product of the mass and the acceleration of the object.

New node

Basically, F=ma, SI unit for force: newton (N), 1N = 1kg m s^-2

The direction of the force is the same as the object's acceleration

The direction of the free body is dependent on the resultant force

Newton's 3rd Law

For every action there is an equal and opposite reaction

Action and reaction act on different objects

Resultant Force

A resultant force would cause...

A moving object to..., A stationary object to move, Stop, Increase speed, Decrease speed, Change direction, Deform

For parallel forces, it can be calculated by addition or subtraction


Bad effects

Creates Heat, Causes wear and tear

Wastes energy

Good effects

Prevents slip

Reducing friction

Moving parts made smooth

Materials with low friction resistance

Use lubricants

Use air cushion

Depends on

Material type


is proportional to the force pressing surfaces together

1kg = 10N