chap 4 test Flashcards
(16 cards)
What is the total momentum at the end of a collision
the same as at the beginning
what is the formula of momentum
mass times velocity
what is the law of conservation of momentum
momentum can be transferred but not lost
what is newtons third law
for every action force there is an equal and opposite reaction force
What are the two factors that contribute to an objects momentum
mass and velocity
What is the formula for determine the momentum of an object
p=m x v = momentum equals mass x velocity
when two or more objects collide what is the total momentum at the end of the collision
the same as in the beginning because according to the law of conservation of momentum momentum can be transferred but not lost
what happens when a cue ball strikes a rack of 15 stationary balls and comes to complete stop
the balls scatter in all different directions because due to the law of conservation of momentum momentum can be transferred but not lost
if the total momentum of a rocketed its fuel remains at zero after being launched why does the rocket still move upward
because as fuel is burned the rocket will lose mass and gain velocity
what is newtons third law
the concept that for every action force there is an equal and opposite reaction force there is an opposite reaction force
What can’t you jump as high on a sandy shore than on a a basket ball court
because the sand absorbs your force
When you blow air into a ballon and let it go what happens
the air in the ballon has the same pressure as outside the ballon when this happens the air escaping from the ballon results in a force the opposite direction sending the ballon in the opposite direction
if youre standing in the back of a rowboat and you are trying to jump to a dock 1 yard away why do you find yourself in the water
because the robot reacts to your force by moving backward
when and where was the wheel invented
5500 years ago in the fertile crescent
why did invention of the wheel made life easier
because the wheel has less friction
name four simple machines
wheel, lever, inclined plane, wedge
