Recent content by siriux

@phinds Yes exactly! So I was asked to make assumptions.

I asked prof and he said I should make an assumption about the motion after collision. Thank you DaveC426913.

What does "slam into" mean? The prompt about impulse and momentum says "a large comet or asteroid slammed into the earth". Does the prompt means that the comet or asteroid combined with the Earth after collision and moved together at same speed after the collision?

Sorry I missed a full stop. So according to the textbook, "no contact" is the sufficient condition of "no normal force", which I think is wrong while I agree its conversion ("No contact" means "no normal force".) is right as you've just said.

I agree with you SammyS but the statement appears in Physics by Randall D. Knight pg225 paragraph 2 which precisely says Did I understand this quote correctly?

"If there's no normal force, there's no contact." Is the statement above correct? What is the relationship between contact and the existence of normal force? Are they necessary and sufficient conditions to each other? Thanks for your help :p