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Chapter 10 Section 2
Physics pages 340-348
| Question | Answer |
|---|---|
| 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. |
Created by:
Tom Radeke
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