Change in momentum after hitting a wall

AI Thread Summary
The discussion revolves around calculating the change in momentum when a 1.0 kg ball traveling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s. The correct answer for the change in momentum is determined to be 6 kg m/s, corresponding to option C. The user initially miscalculated the change in momentum as 2 kg m/s, not accounting for the direction of the velocities. The importance of considering the sign associated with velocity in momentum calculations is emphasized. This highlights a common error in physics problems involving momentum and direction.
gake
Messages
12
Reaction score
0

Homework Statement



32) The change in momentum, in kg m/s, that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a wall
and bounces back at 2.0 m/s is
A) 2.
B) 4.
C) 6.
D) 8.
Answer: C

Homework Equations



Momentum==Mass*Velocity

The Attempt at a Solution



I get A.

Momentum1==1*4
Momentum2==1*2

Momentum1-Momentum2==2
 
Physics news on Phys.org
Consider the "sign" associated with the two velocities.
 
What a dumb mistake! Thanks :)
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Struggling to make relation between elastic force and height'

Thread 'Struggling to make relation between elastic force and height'

Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
View full post »

Similar threads

Ambiguous question on momentum and how it works...
Replies
13
Views
1K
Work done during a collision -- Change in Kinetic Energy & change in Momentum
Replies
1
Views
2K
How Does Impulse Relate to Momentum Change in Physics Problems?
Replies
7
Views
2K
Conservation of momentum (wrecking ball hits a stationary object)
Replies
10
Views
3K
Golf club 🏌️and ball ⛳ impulse problem
Replies
19
Views
3K
Find Mass 2 with Momentum Conservation
Replies
9
Views
3K
Momentum in different referance frames
Replies
6
Views
2K
Change in momentum when given the speed (not the velocity).
Replies
2
Views
3K
Which Force is Represented by the Gradient of the Ball-Wall Collision Graph?
Replies
3
Views
4K
Change in momentum for a satellite in circular orbit
Replies
6
Views
3K

Hot Threads

Recent Insights

Back
Top