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Published byTodd Allison Modified over 7 years ago

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Types of Forces

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What is a force? A push or a pull

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Push Pull

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How do we measure force? The unit used to measure force is the Newton (N)

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Direction of the force The direction of a force is the direction of the push or pull. In what direction is the push or pull below?

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Combining Forces When more than one force acts on an object, the forces combine. The combination of all the forces on an object is called the net force.

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How do forces in the same direction combine? ADD the forces together to form net force. What is the net force below? 10 N

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How do forces in opposite direction combine? SUBTRACT: larger force minus the smaller force What is the net force below? In what direction will the object move? Larger force - smaller force 6 N - 3 N = 3 N To the left 3 N

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What is inertia? The tendency of an object to resist a change in its motion. Mythbusters: Tablecloth Inertia

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The more mass an object has, the greater its inertia. Which is harder to push??

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Wear seat belts! Because of inertia, objects (including you) resist changes in their motion. When the car going 80 km/hour is stopped by the brick wall, your body keeps moving at 80 km/hour. Don’t let this be YOU!

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Contact Force A force exerted only when two objects are touching each other. Friction Air Resistance Buoyant force Tension Compression Non-contact Force A force exerted by one object on another object when the objects are not Touching Gravity Electrical force Magnetic force

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Friction A force that opposes the motion of two surfaces in contact. Smoother surfaces = less friction Rougher surface = more friction

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OR

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Air Resistance Force exerted by air on objects moving through the air.

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Buoyant Force The upward force that keeps things floating.

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Tension A pulling force

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Blast from school’s past! Tension is the force that pulls two tectonic plates apart!!

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Compression Force that pushes objects together

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Gravity A pull that every object exerts on another object due to its mass.

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Electrical Force Charged objects repelling or attracting each other. + + = repel + - = attract

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