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Gravity and Friction (Types of forces:, Contact force: Push or pull that…
Gravity and Friction
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- Contact force: Push or pull that an object receives from other object touching it.
- Non- Contact force: A push or pull an object receives from other object that is not touching it.
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- All forces have strength and direction
- Arrows are used to show forces
- The direction that the arrow shows is the direction of the force
- If the arrow is big, there is many force but if the arrow is small, there is less force
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- Gravity is an attractive force that exists between all the objects that have mass
- The law of universal gravitation states that all objects are attracted to each other by a gravitational force. The strength of the force depends on the mass of each object and the distance between them.
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- When the mass of one or more objects increases, the gravitational force also increases.
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- The attraction between objects decreases as the distance between objects increases.
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- The gravitational force that the Earth exerts on you is greater than the force exerted by any other object.
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- It is a force that resists the motion of two surfaces that are touching.
- Static friction: Acts between objects that are not moving.
- Sliding friction: Occurs when one solid surface slides over another
- Fluid friction: Occurs when one object moves through a fluid.
- Friction is caused when there is an attraction between the particles of the two objects that are touching.
- Friction decreases with less contact.