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Force and Pressure 1

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What are Forces? A push or pull

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Examples of Forces Squeezing Stretching Twisting Folding

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**Effects of Forces Object’s shape changes Object’s size changes**

Stationary object moves

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**Effects of Forces Moving object stops**

Moving object speeds up or slows down Direction of an object’s motion changes

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Weighing scale

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Tsunami

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Weight lifting

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Ultimate frisbee

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Naruto vs Sasuke

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**Measuring Forces S.I unit of force is newton (N)**

Spring balance used to measure the amount of force applied

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**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

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**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

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Forces Around Us Gravity Friction Magnetism

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**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

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**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

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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

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**What is Pressure? Amount of force acting on a unit area**

A sharp object pierces a surface more easily than a blunt object

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Calculating Pressure Force Pressure = Area

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**Applications of Pressure in Everyday Life**

Bulldozer Can openers Knife Plane Suction cups

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A push or a pull on an object is called a force.

A push or a pull on an object is called a force.

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