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### 14 Cards in this Set

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 what is the first law of motion an object at rest will remain at rest an object in motion will continue moving in a straight line at a constant speed until an outside force acts on it what is the 2nd law of motion an object's acceleration depends on the size and dirction of the force acting on it and on the mass of the object. what is the 3rd law of motion forevery action force there is an equal and oppsite reaction force what do the laws of motion explain the movement of objects on earth and in space. when you look at a train,how do you know its moving its postion changes when youare reading a magzine in a car trraveling 55mph,why does the magzine appear to be not moving because of your frame of referance for 2 cars to have the same velocity,what 2 things must they have in common speed direction when is the only time you arent accerating when you are traveling in a straight line at a constant speed y is it harder to stopa car rather than a bicycle the greater mass, the greater momentum what cause you to move forward in a car seat when the car stops interia when u hit a marble y does the other one stops conseravition ofmomentum whenyou goup an escalator, how do you know younare in motion ???????????????????????? ifyou are jogging in place, why cant we measure your speed ?????????????????????? if the earth pulls on a child with a forceof 20n, what amout does the child exert on the earth ????????????????????????????