# Forces and Motion

FORCES AND MOTION
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Slide 1: Tekstslide
ScienceSecondary Education

In deze les zitten 20 slides, met interactieve quiz en tekstslides.

Lesduur is: 40 min

## Onderdelen in deze les

FORCES AND MOTION

#### Slide 1 -Tekstslide

Prior Knowledge/SS questions

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Have you thought about ........
Why is a bowling ball harder to move than a golf
ball?

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Sir Issac Newton
• One of the most brilliant scientists in history
• Made many important
discoveries in physics
• Newton’s three laws of motion
• Explain  relationships between the forces acting on an object, the object’s mass, and its motion.

#### Slide 4 -Tekstslide

Tell us all you know about force and motion?

Overview

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Recap on Forces
1. A force is a push or pull, or any action that is able to change motion.
2. Forces can be used to increase or decrease the speed of an object .
3. Change the direction an object is moving.
4. Change in velocity requires force.
5. Velocity is speed with direction

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Newton First Law
An object at
rest will stay at rest and an object
in motion will stay in motion with
the same velocity unless acted on
by an unbalanced force

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Inertia
The property of an object
that resists changes in its motion.

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Newton Second Law
The amount of acceleration depends
on both the force and the mass

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Newton Second Law
A change in motion occurs only if a net force is exerted on an object.
A net force changes the velocity of the object, and causes it to accelerate.
If an object is acted upon by a net force, the change in velocity will be in the direction of the net force.
The acceleration of an object depends on its mass.
The more mass an object has or the more inertia it has, the harder it is to accelerate.
More mass means less acceleration if the force acting on the object is the same.

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Newton Third Law
Every action force creates a reaction force
that is equal in strength and opposite in
direction.

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Acceleration
Acceleration is the rate at which your
velocity (speed with direction) changes.

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Acceleration
• If an object’s acceleration is zero, the object must be moving at a constant speed in a straight line (or stopped).
• Acceleration occurs whenever there is a change in speed, direction, or both.

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Acceleration
To calculate
acceleration, you divide the change in speed by the amount of time it  takes for the change to happen.

Acceleration = Change in speed
/Change in time

Units of m/s2

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F=ma
Force causes acceleration, and mass resists
acceleration.
The stronger the force on an object, the greater its acceleration.
The greater the mass, the smaller the acceleration for a given force

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Content on each Law

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Newton Law 2
Simulation experiment