Balanced and Unbalanced Balanced and Unbalanced ForcesForces

- Learning Objectives:Learning Objectives:- Explain how forces affect the motion of an Explain how forces affect the motion of an

objectobject

Starter: Find the forces

Learning outcomesLearning outcomesAll:All: List the four states of motionList the four states of motion

Most: Most: Describe the state of motion of an object Describe the state of motion of an object

considering the forces acting on inconsidering the forces acting on in

Some:Some: Explain, using Newton’s First Law, the state of Explain, using Newton’s First Law, the state of

motion of an objectmotion of an object

Representing forcesRepresenting forces Arrow size =Arrow size =

magnitudemagnitude Direction givenDirection given

Sunday 14 May 2023

Representing Forces A force is a vector quantity. It always has a size (magnitude) and

direction. We represent the force using an arrow

the length of the arrow represents the size of the force

the direction of the arrow represents the direction of the force.

Tug of War Objects can have more than one

force acting on them These forces can act in different

directions The forces can be balanced or

unbalanced

Newton’s First LawNewton’s First Law““An object remains at rest or at a An object remains at rest or at a constant velocity unless acted upon constant velocity unless acted upon

by unbalanced forces”by unbalanced forces”

1)1) Accelerating- unbalancedAccelerating- unbalanced2)2) Decelerating- unbalancedDecelerating- unbalanced3)3) Constant speed- balancedConstant speed- balanced4)4) Stationary- balancedStationary- balanced

What could the car be What could the car be doing?doing?

1)1) AcceleratingAccelerating2)2) DeceleratingDecelerating3)3) Constant speedConstant speed4)4) StationaryStationary

States of motion

Accelerating

Constant speed

Decelerating

In what other state of motion would the forces be balanced?

Balanced/UnbalancedBalanced/Unbalanced1)1) Just fallen out of planeJust fallen out of plane2)2) Just opened parachuteJust opened parachute3)3) Floating down nearly landedFloating down nearly landed

Resultant forces- Resultant forces- Which Which way will the box move?way will the box move?

55 4433 6 6 22

88 10 103 4 7 133 4 7 13

1 4 8 11 4 8 1