- #1
Tasdel
Hi there, I am doing a physics assignment. I had to use a program called tracker to simulate the movement of a puck.
So I just need some help to see if anyone can figure out what I've done wrong as something isn't making much sense. Let's jump right into it.
When the puck moves down and hits the "fence" it bounces back with the same constant velocity in the opposite direction. I calculated (when its going down towards the fence) it is going -0.7m/s. The puck had a mass off 0.025kg.
So I calculated my initial velocity or pi = mi * -vi = 0.025 * 0.7 = -0.0175
Final velocity, its going back up away from the fence. so: pi = mi * vi = 0.0175
NOW I had to calculate the change in momentum. Δp=pf - pi = 0.0175 - (-0.0175) = 0.035 kg *m/s
Is this ok so far?
The force of the puck bouncing (according to my graph and it was almost the exact same as the examples graph for my project which was around 0.37N)
The puck literally touched the fence for 0.046 seconds. (I found the initial time and final time of contact)
I had to find the Favg of the puck. so they give me the equation Fave*Δt =Δp
so I did F = Δp/Δt.
F=0.037/0.046
=0.80.
So my main questions are
1)did I calculate the Δp right?
2)why is the force I am calculating a little more than double the force? did I do the force wrong?
3)when does it matter using p=mv and p=mΔv?
Thanks so much for your time. Sorry for the silly questions.
So I just need some help to see if anyone can figure out what I've done wrong as something isn't making much sense. Let's jump right into it.
When the puck moves down and hits the "fence" it bounces back with the same constant velocity in the opposite direction. I calculated (when its going down towards the fence) it is going -0.7m/s. The puck had a mass off 0.025kg.
So I calculated my initial velocity or pi = mi * -vi = 0.025 * 0.7 = -0.0175
Final velocity, its going back up away from the fence. so: pi = mi * vi = 0.0175
NOW I had to calculate the change in momentum. Δp=pf - pi = 0.0175 - (-0.0175) = 0.035 kg *m/s
Is this ok so far?
The force of the puck bouncing (according to my graph and it was almost the exact same as the examples graph for my project which was around 0.37N)
The puck literally touched the fence for 0.046 seconds. (I found the initial time and final time of contact)
I had to find the Favg of the puck. so they give me the equation Fave*Δt =Δp
so I did F = Δp/Δt.
F=0.037/0.046
=0.80.
So my main questions are
1)did I calculate the Δp right?
2)why is the force I am calculating a little more than double the force? did I do the force wrong?
3)when does it matter using p=mv and p=mΔv?
Thanks so much for your time. Sorry for the silly questions.