Force

Types of ForcesGravity, Mass and Weight

Effects of Forces

What is force?

Push

Pull

What is force?

An interaction between two massesCommon symbol: F

Unit: Newton, N

May the Force be with you.

Types of Forces: Contact Force

PullNormal Force

Friction

Tension

UpthrustDrag

Types of Forces: Contact Force

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Thrust

Types of Forces: Contact Force

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Thrust

Lift

Types of Forces: Contact Force

Weight

Gravitational Force

Types of Forces: Non-Contact Force

Region of space around a body

How can gravitational force act without contact?

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Thrust

Gravitational force acts within the gravitational field

Mass versus Weight

• Mass– Amount of matter in an

object– unit: kilogram, kg– Does not change with

location

Mass versus Weight

•Weight•Gravitational force on the object•Unit: Newton, N• Equal to mass x acceleration due to gravity

W = m x gWhere g = 9.81 ms-2

• Changes with location

Types of Forces: Non-Contact Force

Electrical Force

Types of Forces: Non-Contact Force

Magnetic Force

Weight

Normal force

Weight

Air resistance

Weight

Normal Force

Drag

Friction

Thrust

Weight

Upthrust

Drag Thrust