Newton Laws of Motion

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

Edited at 2020-10-08 08:28:11

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Newton Laws of Motion

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Outline

Concept-Map-of-Newton-Laws-of-Motion

Friction

Force that opposes motion

Advantages and Disadvantagesof Frictions

Ways to Reduce Friction

Scale Diagram to solve for forces

Use to solve

Resultant Forces

Use Parallelogram/Triangle Method

Resultant force must have double arrow head

Forces in Equilibrium ( No balanced forces)

Use closed triangle method

Things to include in diagram:

1. Scale (1 cm rep 100N)

2. Parallelogram/ Triangle Method

3. Answer must include: Magnitude of Force and direction (means angle to which force)

Newton 1st Law

an object at rest will remain at rest

E.g: Book Resting on a table

an object in motion will continue in motion atconstant speed in a straight line in the absenceof a resultant force acting on it.

Terminal Velocity

For Falling Object,

when Weight = Air Resistance,

No Resultant Force --> No Acceleration

Falling at a constant velocity (Terminal Velocity)

Factors Affecting Terminal Velocity

Mass

The greater the mass, the greater the terminal velocity

Surface Area

The greater the surface area, the smaller the terminal velocity

Newton 2nd Law

Newton’s second law of motion states that theresultant force acting upon an object is equal to theproduct of the mass and the acceleration of theobject.

Fr = ma

Resultant of Parallel Forces

Resultant of NonParallel Forces

Newton 3rd Law

Newton’s third law of motion states that for every action there is an equal and opposite reaction

If object A exerts a force on object B, then B exerts an equal but opposite force on A

Newton’s third laws tells us 4 characteristics of forces:

1. Forces always occur in pair. Each pair is made of an action and reaction.

2. Action and reaction forces are equal in magnitude.

3. Action and reaction forces are opposite in direction.

4. Action and reaction forces act on different bodies.