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Force and Pressure
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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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Object’s shape changes Object’s size changes Stationary object moves
Effects of Forces
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Moving object stops Moving object speeds up or slows down Direction of an object’s motion changes
Effects of Forces
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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
Pressure = ForceArea
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Applications of Pressure in Everyday Life
Bulldozer Can openers Knife Plane Suction cups