Balanced And Unbalanced Forces

Balanced and Unbalanced Forces If forces are balanced then an object is either stationary (not moving) or moving at a constant (unchanging) speed. If forces are unbalanced then an acceleration (getting faster) or deceleration (getting slower) occurs. Balanced or unbalanced? Take a look at the following situations. Are the forces balanced or unbalanced?

Example 1 air resistance & friction

driving force from engine

The forces are ______________

Example 2

air resistance & friction

The forces are ______________ driving force from engine

Example 3

air resistance

The forces are ______________

& friction

What is happening to the speed of the car in each example? Example 1:__________________________________________________________ ___________________________________________________________________ Example 2:__________________________________________________________ ___________________________________________________________________ Example 3:__________________________________________________________ ___________________________________________________________________

A

There are 2 forces acting on Garry the Goat. One force is his weight, and the other force is the rock pushing against his feet. What is force A? ______________________________ ____________________________________________

B

What is force B?_______________________________

____________________________________________ Are these forces balanced or unbalanced?_________________________________ What would happen if force A was bigger than force B?_______________________ ___________________________________________________________________ What would happen if force B was bigger than force A?_______________________ ___________________________________________________________________

Add all force arrows (including weight) to Bart for the following situations:

Bart is stationary (not moving)

Bart is accelerating to the right (getting faster)

Bart is moving at a constant speed to the right

The ball has just been kicked and is moving away from the footballers. Can you draw arrows for the forces on the ball? HINT: Be careful to draw arrows for the forces, and not the ball’s movement!

Balanced and Unbalanced Forces If forces are balanced then an object is either stationary (not moving) or moving at a constant (unchanging) speed. If forces are unbalanced then an acceleration (getting faster) or deceleration (getting slower) occurs. Balanced or unbalanced? Take a look at the following situations. Are the forces balanced or unbalanced?

Example 1 air resistance & friction

driving force from engine

The forces are ______________

Example 2

air resistance & friction

The forces are ______________ driving force from engine

Example 3

air resistance

The forces are ______________

& friction

What is happening to the speed of the car in each example? Example 1: The car is either _______________ or moving at a ______________ speed.

Example 2:The driving force is bigger than the air resistance and friction, so the car must be _______________

Example 3: The only force is the air resistance/friction, so the car must be ______________________