(1)A collision of a system is inelastic if the system loses potential energy. Tr

Question

(1)A collision of a system is inelastic if the system loses potential energy.

True

False

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(2) A woman and a child (the woman has a greater body mass than the child) sit on a frictionless surface and push each other in opposite directions. Which one moves at a higher speed?

a-The woman

b- the child

c-The woman and the child have the same speed because they have the same momentum.

d- Not enough info.

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(3) Kinetic energy is conserved in inelastic collisions.

True

false

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(4) Kinetic energy is conserved in elastic collisions.

true

false

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(5) The momentum of a system is conserved if the sum of external forces on the system is zero.

true

false

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(6) A bike has a momentum magnitude of 30 N.s. What would the bike's momentum be if its mass was doubled and moved with the same velocity?

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true

false

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(8) For the motion sensor to work properly, the cart has to be at least 0.3 meters away from it.

true

false

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i would realy appreciate IT if you solve them ALL

Explanation / Answer

2) F = ma

from newton 3rd law force will be equal .

a = F/ m

so child will have greater acc. so child will attain greater speed.

(b)

3. No , energy is lost in inelastic collision.

ANs. False

4. Yes. energy is conserved in elastic.

True.

5. if Fnet = 0

then from 2nd law, Fnet = ma = 0

a = 0

so system will move with same momentum.

True

6. momentum. p = mv = 30 N.s

now m' = 2m

so p' = 2p = 60 N.s

7.direction of velocity change,

and velocity and momentum are vector equantity.

hecne momentum changes.

False

8.

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