Recent content by PhysicsPhil

I think my confusion came in because I thought there were 2 forces action on the body - as I saw it in my mind's eye - there was a force from 1 the 1kg object that impacted the second object and "pushed" (put a force on it) in the positive x-direction, while it deaccelerated from the Force of...

Homework Statement A 1 kg object is moving along at speed of 5 m/s right before colliding with a 4 kg stationary object, in a perfectly inelastic collision. Suppose that the objects are moving on a surface that has a coefficient of friction of mu=0.2. (Note you may still assume that the...

Yes... :)

I got this sucker. Conservation of Momentum. Conservation of KE. Solve system of equations! :)

Kinetic Energy is conserved in any elastic collision. I'll try to see if I can piece something together from that, but wouldn't KE depend on velocity as well?

[SOLVED] Elastic Collision - but no Final Velocities given! Homework Statement An object of mass 2.0kg is moving at 4.0 m/s to the right. It collides elastically with an object of mass 1.0kg moving at 12.0 m/s to the left. Calculate the velocities of the objects after the collision...

I found the three laws of Newton on a neat website (and am going to print them out and post it on my wall!). My guess is you are referencing the third law: III. For every action there is an equal and opposite reaction. But this doesn't seem to make conceptual sense to me. Yes by the...

Thanks. That makes sense and I feel silly for not realizing it. I think what threw me off was how the question worded "the initial speed of the ball is 136mph" - so I immediately went Vi = 136mph ... Now I realize that its final velocity (in regards to velocity post-impact) is 136mph (60.797...

I've thought about my question more and now I'm thinking maybe I misinterpreted one of the calculations. Perhaps change in momentum can't equate to m(Vf - Vi) ...

[SOLVED] Calculate Average Force by finding Impulse over Impact Time Homework Statement A movie depicting a 55-g golf ball hit with a club shows that the impulse time between the club and the ball is 0.2 ms, and the initial speed of the ball is 136 mph. a) What is the average force exerted...