science test

By k_witt86959, Mar 2007

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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	????????????????????????????

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