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# Chapter 10 Section 2

### Physics pages 340-348

friction the force that one surface exerts on another when the two surfaces run against each other
static friction friction that acts on objects that are not moving
sliding friction friction that occurs when one solid surface slides over another
rolling friction friction that occurs when an object rolls over a surface
fluid friction friction that occurs as an object moves through a fluid; drag
gravity the force that pulls objects toward each other
mass a measure of how much matter is in an object
weight a measure of the force of gravity on an obect
free fall the motion of a falling object when the only force acting on it is gravity
air resistance the fluid friction experienced by an object falling through the air
terminal velocity the greatest velocity a falling object can achieve
projectile n object that is thrown
What are the uses of static and sliding forces? Static friction allows an object to stay in place; sliding friction allows an object to come to a stop
What is the difference between weight and mass? Mass is the amount of matter in an object; weight is the force of gravity on an object
How does gravity affect objects that are moving horizontally? It pulls objects toward the center of the Earth in the same way it pulls a dropped object.
What are the four types of friction? sliding, rolling, fluid, and static friction
What factors affect the friction force between two surfaces? the strength of the friction force between two surfaces depends on the nature of the two surfaces and how hard they push together
What types of friction occur when you ride a bike through a puddle? rolling and fluid friction
What is the law of universal gravitational? the force of gravity acts between all objects in the universe
How do mass and distance affect the gravitational attraction between objects? the more mass an object has, the strength of its gravitational force; the greater the distance between two objects, the weaker the gravitational force between them
How would your weight change on the surface of an Earth sized planet with greater mass? Why? Your weight would be greater because the gravitational force would be greater.
Why does an object accelerate when it falls toward the Earth's surface? Gravitational force causes the object to accelerate towards the center of the Earth.
How does the mass of an object affect its acceleration during free fall? It has no effect on its acceleration during free fall.
What force changes when a sky diver's parachute opens? What force remains constant? Air resistance increases; but the force of gravity remains the same.

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