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1 1 Force and Pressure. 2 What are Forces? A push or pull.

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Presentation on theme: "1 1 Force and Pressure. 2 What are Forces? A push or pull."— Presentation transcript:

1 1 1 Force and Pressure

2 2 What are Forces? A push or pull

3 3 Examples of Forces Squeezing Stretching Twisting Folding

4 4 Objects shape changes Objects size changes Stationary object moves Effects of Forces

5 5 Moving object stops Moving object speeds up or slows down Direction of an objects motion changes Effects of Forces

6 6 Weighing scale

7 7 Tsunami

8 8 Weight lifting

9 9 Ultimate frisbee

10 10 Naruto vs Sasuke

11 11 Measuring Forces S.I unit of force is newton (N) Spring balance used to measure the amount of force applied

12 12 Types of Spring Balance Extension spring balance Spring stretches when a pulling force acts on it Greater force, greater extension Spring attached to a pointer which indicates the amount of force exerted on the spring

13 13 Types of Spring Balance Compression spring balance Spring compressed when a pushing force acts on it Greater force, greater compression Spring attached to a pointer which indicates the amount of force exerted on the spring

14 14 Forces Around Us Gravity Friction Magnetism

15 15 Gravity Gravity is the force that attracts objects to the Earth Mass is a measure of the amount of matter in a body Weight is a measure of the gravitational force exerted on the object

16 16 Friction Frictional force acts when one materials rubs against another Friction is useful in walking and when applying brakes to stop a car Constant friction leads to wear and tear Friction produces heat

17 17 Magnetism Magnetism is the force exerted by a magnet on magnetic materials such as iron and steel Every magnet has a North pole and a South pole Like poles repel Unlike poles attract

18 18 What is Pressure? Amount of force acting on a unit area A sharp object pierces a surface more easily than a blunt object

19 19 Calculating Pressure Pressure = Force Area

20 20 Applications of Pressure in Everyday Life Bulldozer Can openers Knife Plane Suction cups


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