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Phys. Sci. C7
Physical Science Chapter 7
| Question | Answer |
|---|---|
| ( ) is when an object chanfes place or position compared to a different object. | motion |
| there is ( )-( ) motion, ( ) motion of spinning, and ( ) motion when an object moves around another object. | straight-line, rotational, orbital |
| motion must be ( ) to other ( ) | related, objects |
| we need ( ) points | reference |
| a ( ) of ( ) is a set of objects that are still. | frame of reference |
| we compare an object to them to see that there is ( ) | motion |
| Ex. push a chair down the hall, what is part of the fram of reference? | lockers, doors, fountains, etc. |
| how do you know that these things are not moving? | our experience tells us that buildings do not normally move. |
| can it be difficult to tell if there is motion? | yes, if there is no good frame of reference. |
| how do we measure motion? | by speed or rate |
| speed or rate is.... | how fast something is moving |
| speed is always ( ) as ( ) traveled by ( ). | measured as distance traveled by time |
| units will vary in ( ) ( ) | different situations |
| average speed equals... | the total distance traveld divided by that total time it took |
| velocity equals... | speed with direction |
| ( ) is a quantity of the mass of an object multiplied by its verlocity. | momentum |
| a train moving at 80 km/h is harder to stop than a car traveling at the same speed. why? | the train has more mass and therefore has more momentum. |
| momentum=( )x ( ) | mass x velocity |
| p = ( ) x ( ) | m x v |
| a change in velocity divided by the time it took to change | acceleration |
| the symbol delta looks like what shape, and what does it mean? | triangle, change |
| the cause of acceleration or changes in an object's velocity. | force |
| the combination of all forces acting on an object | net force |
| an object will accelerate in the direction of the ( ) ( ) | net force |
| if net force is zero then an object does not ( ) | accelerate |
| it keeps doing whatever it was doing ( ) | before |
| ( ) ( ) | dont change motion |
| since ( ) forces do not cancel eachother,( ) ( ) cause objects to ( ) | unbalanced, unbalanced forces, accelerate |
| a force of nature that acts on materials that are in contact with each other | friction |
| this force always acts in a direction ( ) to motion between the objects | opposite |
| ( ) force is needed to keep a car moving just to overcome friction | constant force |
| ( ) and ( ) experience friction. it is just not ( ) | liquids and gases, solids |
| ( ) can help keep things from moving | friction |
| a shoe on ice has | low friction |
| a shoe on concrete has | higher friction |
| the ( ) of ( ) depends on the kinds of material in contact and how much the surfaces are pressed together | force of friction |
| a force of attraction in nature that exists between 2 pieces of matter due to their mass | gravity |
| as ( ) pulls objects down, only friction of ( ) can stop them from accelerating | gravity, air |
| air ( ) is friction of air against the surface of a falling object | resistance |
| think about ( ) area and air resistance | surface |
| what does newtons first law do? | predicts how objects behave as they experience balanced as they experience balanced forces |
| an objects at rest remains at ( ) | rest |
| an object in motion remains in ( ) | motion |
| these 2 conditions ( ) only when ( ) forces cause a change | change, unbalanced |
| newtons 1 law is also called | law of inertia |
| the tendancy of an object to remain at rest or remain in motion | inertia |
| predicts how objects behave as they experience unbalanced forces | newtons second law |
| the unbalanced force equals the mass of object multiplied by its acceleration | newtons 2nd law |
| f is ( ) in n | force |
| m is ( ) in kg | mass |
| a is ( ) in m/s^2 | acceleration |
| force is measured in | newtons |
| motion due to the acceleration caused by gravity | free-fall |
| when a falling object quits accelerating because air resistance opposes gravity | terminal velocity |
| forces occur in pairs | newtons 3rd law |
| for every ( ) force ther is an equal and ( ) reaction force | action, opposite |
Created by:
darrl
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