Question

Contrast and compare elastic and inelastic collisions.

Question 4 options:

	Both elastic and inelastic collisions have conservation of momentum if there are no outside forces. They are different in that elastic collisions bounce and inelastic collisions stick, and kinetic energy is conserved in inelastic collisions.
	They are basically the same thing, except the units are different.
	Elastic collisions do not have conservation of momentum and inelastic collisions have conservation of momentum if there are no outside forces. They are different in that elastic collisions bounce and inelastic collisions stick, and kinetic energy is not conserved in inelastic collisions.
	Both elastic and inelastic collisions have conservation of momentum if there are no outside forces. They are different in that elastic collisions bounce and inelastic collisions stick, and kinetic energy is not conserved in inelastic collisions.

Question 5 (1 point)

In order to decrease the force in a collision, you should increase the ____.

Question 5 options:

	velocity
	mass
	time
	speed

View hint for Question 5

Question 6 (1 point)

Which imparts more impulse to a wall?

Question 6 options:

	a 1 kg ball moving at 5 m/s that bounces off the wall
	a 1 kg glob of mud moving at 5 m/s speed that sticks to the wall
	both are the same

Question 7 (1 point)

Which is correct?

Question 7 options:

	In an inelastic collision p is conserved but KE is not.
	In an elastic collision p is conserved but KE is not.
	In an elastic collision neither KE nor p is conserved.
	In an inelastic collision both KE and p are conserved.

Answer 1

Use the properties of elastic and inelastic collision to find the correct options for the given problems as shown below

inelastic collision don't have conservation of kinetic energy. So, the 4th (last) option is correct so increasing time would decreas force. 6) Let initial direction toward the ball be positive then when lkg ball bounces off, impulse - AP = mav = (114) (4-Vi) = (119) (-5m) -5m25) = -10kg. mis In and case, impulse - Ap = mav = (119) (vt-Vi) = (119) (0 -5m25) = -5kg. m/s impulse on ball is larger in magnitude in 1st case So, impulso on wall will also be larger in 1st case Hence correct option is the 1st option 7) In elastic collision, both P and KE are conserved. In inelastic " only p is conserved So, correct option is 1st option /

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This concludes the answers. If there is any mistake or omission, let me know in the comments immediately and I will fix it....