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Unit 2 test
Unit 2 Test Study Guide (Friction,Gravity and Newton's 1)
| Question | Answer |
|---|---|
| why is it easy to slip when there is water on the floor | there is less friction |
| what factors impact the amount of friction between objects | the amount of force between the objects and the roughness of the surfaces |
| a box being pushed across the floor (type of friction) | sliding |
| a bird flying through the air air (type of friction) | sliding |
| a book sitting on a table (type of friction) | static |
| riding a skateboard (type of friction) | rolling |
| which of following examples has the greatest amount of friction between the object | a box being pushed across the floor |
| why must you exert a force to pick up an object ? what must you overcome | an object at rest tends to stay at rest you must overcome gravity |
| Law of Universal Gravitation | Gravitational force increases as mass increases Gravitational force decreases as distance increases |
| weight | measurement of how hard gravity is pulling on that object |
| mass | amount of matter in an object does not change based on location |
| if earths mass doubled without changing its size, what would happen to your weight | your weight will double because of the increase in gravitational force |
| how would the gravitational force between 1kg of lead and earth compare to the gravitational force between 1kg of marshall and Earth | the gravitational force would be equal because the masses are equal |
| a penny is dropped from the top of a tall stairwell. what is the penny's velocity after it has fallen for 4s | 39.2 |
| terminal velocity | is the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity |
| what is not projectile motion | swimming in a pool of water |
| the acceleration of an object depends on the mass of the object and the amount of force applied | newton's 2 |
| whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first | newton's 3 |
| according to newton's 2 law how can you increase the acceleration of an object that is pushed by a force | reduce the mass or increase the force applied |
| when you ride the bus, why do you fall forward if you are standing and the bus moving | when the bus stops your inertia hasn't been changed and you will continue in motion |
| when a soccer ball is kicked, why don't the action and reaction forces cancel each other out | the forces act on opposite objects |
| what would have to have to happen to the force applied if you wanted to accelerate two objects with different at the same rate | you would have to use a greater force with the larger object |
Created by:
smileyk
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