8.0 - Forces and simple machines

Force

a push, pull or twist on an object

when it interacts with another object

Direct force

a force that acts on an

object when in contact with another

object

Friction

when two objects slide past

each other

Tension

a pulling force applied by

each end of an object such as a string

or rope

Newton (N)

the unit for measuring

force

Indirect forces

force that acts

on an object without the need for

physical contact

Three main types of indirect forces

gravitational, magnetic and electrostatic

Direction

The direction of the force affects the direction that an object

moves in

Magnitude (size)

the size or power

of an object, energy or force

Mass

the amount of matter an object contains

Higher mass = Requires more force to move or stop it compared to a lighter one

Net force

the sum of all forces

acting on an object