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Physics Chapter 3 Summary- Forces by
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Physics Chapter 3 Summary- Forces

Newton's 1st Law

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), http://www.youtube.com/watch?v=4NQbeZ0EXZQ

Free-fall

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

Resultant Force

A resultant force would cause...

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

Friction

Creates Heat, Causes wear and tear

Wastes energy

Prevents slip

Reducing friction

Materials with low friction resistance

Use lubricants

Use air cushion

Material type

Roughness

1kg = 10N