This discussion is closed.
nofronting
Badges: 1
Rep:
?
#1
Report Thread starter 15 years ago
#1
a toy car of mass 0.05kg collides with a brick. just before it hits the brick, its speed is 3ms^-1. it rebounds at two thirds of its speed. the contact time is 0.2 s.

a- calculate the change of momentum of the car in the impact.

b- calculate the average force on the brick during the impact.
0
rts
Badges: 7
Rep:
?
#2
Report 15 years ago
#2
(Original post by nofronting)
a toy car of mass 0.05kg collides with a brick. just before it hits the brick, its speed is 3ms^-1. it rebounds at two thirds of its speed. the contact time is 0.2 s.

a- calculate the change of momentum of the car in the impact.

b- calculate the average force on the brick during the impact.
a)
p before = mv = 0.15kg m/s
p after = mv = -0.10kg m/s

change in p = 0.25kg m/s

b)

f = dp/dt = 1.25N ->
0
nofronting
Badges: 1
Rep:
?
#3
Report Thread starter 15 years ago
#3
(Original post by rts)
a)
p before = mv = 0.15kg m/s
p after = mv = -0.10kg m/s

change in p = 0.25kg m/s

b)

f = dp/dt = 1.25N ->
Thanks
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Have you made your firm and insurance uni choices yet?

Yes (61)
51.69%
Yes, but I want to swap them (10)
8.47%
No, but I know who I want to choose (14)
11.86%
No, I still don't know who I want to choose (30)
25.42%
I have decided I don't want to go to uni anymore and will not be choosing (3)
2.54%

Watched Threads

View All