This is terrific. Gonna try the online version. We have a chipmunk that does this funny mosh-pit jump. I think the jump is 4 to 6 feet (1.22 m to 1.83 m). I can get pretty solid info about the actual length of the jump, and then the mass, time-of-flight, velocity and so on. Anything I can figure out. Should be fun! 🐿 🥳
I think your acceleration is a bit off because the ball is several centimeters (maybe 10? more?) in front of the ruler/blackboard, so it looks a bit larger than it would if it were at that distance etc.
Hi, what if the visual is not perfectly static, like if i use a drone with the camera pointed to the ground? I have some groun control points, can I in some way measure the real movement of, for example, some pebbles? Is it possible?
Thanks for the bid. Question… imagine that the ball has spin. I assume the ball would need to have one marker/dot to allow analysis. But is it possible to analyse rotation (number of revolutions per minute for ex), rotation axis angle? Thanks
there are a couple of ways to do this -normally, I would just use two points to mark the ball. Then I could calculate the rotation using the vector from one point to the other. If you just want rotation, you can set the coordinate origin to the center of the ball and track one point on the ball. Tracker will then give you a plot of theta and omega
Thanks so much for your reply. Much appreciated. It is not so clear. Do you know any documentation/tutorial that can support me in this process? I need rotation, speed (but speed is simple in tracker), and axis angle. Thx again 🙏
I've tried using this to determine g from Galileo's experiment by rolling a ball on a ramp and then plotting acceleration vs sinA to get g (=9.81). However, my g value comes up short only at 2.7. Was wondering if you had similar experience. I did try free fall, and it did produce g=10 m/s^2, but rolling on a slope did not for unknown reasons to me.
Did you use a plumb line to determine the vertical direction and then use that to measure the ramp angle? That could be one problem. Also, a rolling ball does not have the same acceleration as a frictionless block because of the rotational kinetic energy. Maybe I will try this sometime and see what I get.
@@DotPhysics you mean to include moment of inertia for a solid sphere? g=(1+k)a/sinA, k=2/5 for solid sphere? The plumb line and protractor is a good idea to measure the angle directly rather than calculating it. The examples I've seen on youtube were all done with a cart not a ball, I guess that might be the reason why. I'll have to try again with a cart.
This is terrific. Gonna try the online version. We have a chipmunk that does this funny mosh-pit jump. I think the jump is 4 to 6 feet (1.22 m to 1.83 m). I can get pretty solid info about the actual length of the jump, and then the mass, time-of-flight, velocity and so on. Anything I can figure out. Should be fun! 🐿 🥳
Thank you for the useful video! Appreciate it!
I think your acceleration is a bit off because the ball is several centimeters (maybe 10? more?) in front of the ruler/blackboard, so it looks a bit larger than it would if it were at that distance etc.
Can you measure the longest distance of the ball when it land the ground with this app too ?
Hi, what if the visual is not perfectly static, like if i use a drone with the camera pointed to the ground? I have some groun control points, can I in some way measure the real movement of, for example, some pebbles? Is it possible?
can i use displacement vs time in this instead of coordinates ?
Thanks for the bid. Question… imagine that the ball has spin. I assume the ball would need to have one marker/dot to allow analysis. But is it possible to analyse rotation (number of revolutions per minute for ex), rotation axis angle? Thanks
there are a couple of ways to do this -normally, I would just use two points to mark the ball. Then I could calculate the rotation using the vector from one point to the other.
If you just want rotation, you can set the coordinate origin to the center of the ball and track one point on the ball. Tracker will then give you a plot of theta and omega
Thanks so much for your reply. Much appreciated. It is not so clear. Do you know any documentation/tutorial that can support me in this process? I need rotation, speed (but speed is simple in tracker), and axis angle. Thx again 🙏
I've tried using this to determine g from Galileo's experiment by rolling a ball on a ramp and then plotting acceleration vs sinA to get g (=9.81). However, my g value comes up short only at 2.7. Was wondering if you had similar experience. I did try free fall, and it did produce g=10 m/s^2, but rolling on a slope did not for unknown reasons to me.
Did you use a plumb line to determine the vertical direction and then use that to measure the ramp angle? That could be one problem. Also, a rolling ball does not have the same acceleration as a frictionless block because of the rotational kinetic energy.
Maybe I will try this sometime and see what I get.
@@DotPhysics you mean to include moment of inertia for a solid sphere? g=(1+k)a/sinA, k=2/5 for solid sphere? The plumb line and protractor is a good idea to measure the angle directly rather than calculating it. The examples I've seen on youtube were all done with a cart not a ball, I guess that might be the reason why. I'll have to try again with a cart.