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# 10.2 Friction and Gravity

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## Mike Oz

on 13 March 2015

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#### Transcript of 10.2 Friction and Gravity

10.2 Friction and Gravity
The friction that acts on objects that are not moving is called static friction.
Static Friction
Sliding Friction
Rolling Friction
Fluid friction occurs when a solid object moves through a fluid
Fluid Friction
Gravity
Gravity and Motion
friction - the force that two surfaces exert on each other when they rub together. Works against the direction of motion.
The strength of friction depends on two factors:
Static friction is a result of the gravity on an object. A force greater than that of static friction must be exerted to put an object in motion.
Sliding friction occurs when two solid surfaces slide over each other
Oil is used in a car engine to reduce sliding friction and prevent damage to the engine.
Rolling friction occurs when an object rolls along another surface
Fluid friction is often intentionally created to prevent sliding friction. Examples include oil, water, or air.
gravity - a force that pulls objects toward each other
Law of universal gravitation states that gravity acts between all objects in the universe. The gravitational attraction between two objects is affected by two factors:
weight- the force of gravity on person at the surface of a planet.
free fall - when the only force acting on an object is gravity
Free fall on earth is 9.8 m/s per second.
air resistance - a fluid friction that falling objects encounter.
Projectile Motion
projectile - an object that is thrown
Homework
Observe any busy situation for 5 minutes and take note of all visible examples of the 4 types of friction.

Static:

Sliding:

Rolling:

Fluid:
Objects with greater surface area experience greater air resistance
1. How hard the surfaces are pushed together
2. The type of surface
1. If mass increases, so does force of gravity
2. If distance between objects increases, gravity decreases.
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