# 1.2 Balanced forces

1.2 Balanced and unbalanced
forces
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Slide 1: Tekstslide
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1.2 Balanced and unbalanced
forces

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Learning goals
• Recognise balanced and unbalanced forces.
• Name two things balanced forces can do.
• Name two things unbalanced forces can do.
• Calculate resultant force.

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How do you show forces
You show forces with an arrow.
The length of a force shows the magnetitude.
And the direction of the arrow shows the direction of the force.

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Balanced and unbalanced forces

• Balanced forces
• Unbalanced forces
• Resultant force

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Balanced or unbalanced?

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Balanced or unbalanced?

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Resultant force
A resultant force, also called a net force, is a force equal to the sum of all forces applied to an object.  For example, a 3N force to the left and 10N force to the right gives a resultant force of 7N to the right.

Fingerspell

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• Forces in the same direction add up.

• Forces in opposite direction cancel out.

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The effects of:

Balanced and unbalanced forces

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Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

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Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

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Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

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Stationary: When an object is not moving, standing still

Constant velocity: When an object is moving at a constant speed

Acceleration: When the speed of an object is increasing (or decreasing)

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The forces on an object are
balanced.
How does this effect its motion when...

• It is stationary?

• it is moving at a constant speed?

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Balanced Forces
When an object is...
• stationary –> It stays stationary

• Moving –> travels at a constant speed.

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The forces on an object are unbalanced.
How does this effect its motion when...

• it is stationary?

• it is moving at a constant speed?

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Unbalanced forces
When an object is...
• stationary –> It starts moving

• Moving –> accelerates or decelerates

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balanced forces
Unbalanced forces
stationary objects
Moving objects

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balanced forces
Unbalanced forces
stationary objects
stays stationary
starts moving
Moving objects
keeps the same speed
accelerates/ decelerates

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Working on exercises
Homework:
Do: textbook 1.2 - the yellow block exercises
Do: workbook exercises 1.2 inclusive E