True or flase?
1) If the net external force acting on a system is zero, then the total momentum of the system is also zero.
2) Impulses are smaller when bouncing takes place.
3) After a firecracker falling through the air explodes, the net momentum of its fragments decreases.
4) The padding on a car dashboards lengthens the time of a passenger's impact during a collision.
5)If a net force acts on a system's momentum will change.
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1) False (a system in space can have no force acting on it, but still be moving. If it moves and has mass, then it has momentum)
2) False (boucing makes no difference, the degree of energy lost in each bounce, depends on the energy in the system before the bounce. Bouncing causes an impulse, which means some of that energy could be lost, so each bounce might be less than the last, but only in a real system, not an ideal one).