Chapter Test Friction and gravity
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22 terms
Terms | Definitions |
|---|---|
 force | a push or pull |
| newton | the SI unit in which the strength of a force is measured in |
| net force | the combination of all forces acting on an object |
| unbalanced forces | forces that can cause an object to stop moving, start moving or change direction |
| balanced forces | equal forces acting on an object in opposite directions |
| What do unbalanced forces acting on an object result in ? | Unbalanced forces acting on an object result in a net force and a change of direction to the direction of the larger force |
| What do balanced forces acting on an object result in ? | Balanced forces acting on an object do not change the object's motion. |
| friction | the force that two surfaces excert on each other when they rub against each other |
| static friction | friction that occurs on objects that are not moving |
| sliding friction | friction that occurs when two solid surfaces slide over each other |
| rolling friction | occurs when an object rolls across a surface |
| fluid friction | occurs when a solid object moves through a fluid |
| gravity | the force that pulls objects toward each other |
| What does the law of universal gravitation state ? | The law of universal gravitaion states that the force of gravity acts between all objects in the universe. |
| What affects the gravitational force between objects ? | mass and distance |
| mass | a measure of the amount of matter in an object |
| weight | the force of gravity on a person or object at the surface of a planet |
| free fall | when the only force acting on a falling object is gravity |
| Why do objects accelarate toward the center of the Earth? | gravity is unbalanced |
| air resistance | a type of fluid friction objects falling through air experience |
| terminal velocity | the highest velocity a falling object can achieve |
| projectile | an object that is thrown |
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