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s-ch3
chapter 3
| Question | Answer |
|---|---|
| acceleration of an object is in the same direction as the net force of an object | newton's second law of motion |
| the force that opposes the sliding motion of two surfaces that are touching each other | friction |
| the frictional force that prevents two surfaces from sliding past each other | static friction |
| the force that opposes the motion of two surfaces sliding past each other | sliding friction |
| opposes the motion of objects that move through the air | air resistance |
| an attractive force between any two objects and depends on distance and mass | gravity |
| the gravitational force exerted on an object | weight |
| acceleration toward the center of a curved or circular path | centripetal force |
| when one object exerts a force on a second object, the second on exerts a force on the first that is equal in strength and direction | newton's third law of motion |
| the product of its mass and velocity | momentum |
| what affects gravity | distance and mass of object |
| what are the four basic forces? | gravity, electromagnetic force, strong nuclear force, weak nuclear force |
| what does the law of universal gravitation state? | as distance increases, the gravitational force decreases |
| what is earth's gravitational acceleration? | 9.8 m/s^2 |
| formula for force of gravity | force= mass x acceleration |
| what is weight? | gravitational force exerted on an object, measured in newtons |
| what is mass? | the amount of matter in an object |
| free fall | gives a feeling of weightlessness |
| what is projectile motion? | forces pushes an object forward until friction slows down enough that gravity takes over. |
| what is centripetal force? | the force exerted toward the center of a curved path; |
| what is centripetal acceleration? | the acceleration toward the center of a curved or circular path |
| who was newton? | (1642-1727)- described the effects of forces on the motion of objects |
| what does newton's first law state? | an object at motion -> motion object at rest -> rest |
| what is inertia | tendency for an object to resist change |
| what does newton's second law of motion state? | the acceleration of an object is in the same direction as the net force on the object |
| new formula for acceleration | acceleration= net force/ mass |
| what does newton's third law of motion state? | for every action there is an equal and opposite reaction |
| formula for momentum | mass x velocity= momentum |
| what does law of conservation of momentum state? | the momentum of an object doesn't unless the mass, velocity, or both change. |
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missyprissi96
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