# physics

posted by .

9)Which has more momentum? A .1 kg toy truck moving at 1012 m/s or a real 2200 kg truck moving at .046 m/s?

The real truck since it has more mass

10)A 120 kg football player tries to dive into the endzone at 7.5 m/s to score a touchdown. A 150 kg player dives out of the endzone into the other player at 5 m/s to try and stop him. They collide at the goalline and the tackler holds on to the player diving into the endzone. Does the player score a touchdown or not?

I'm gonna go with yes

• physics -

Momentum is M*V. Are you aware of that? Have you done the numbers?

The toy truck's momentum is 101.2 kg m/s

The real truck's momentum is 101.2 kg m/s

They are the same.

As for the football question, explain why you chose "touchdown".

• physics -

b/c the 120 guy is going faster

• I don't understand -

yes I did the numbers how did you get:
The toy truck's momentum is 101.2 kg m/s

The real truck's momentum is 101.2 kg m/s

• I don't understand -

Momentum is M V. I multiplied M times V.

• I don't understand -

I did the wrong numbers. I changed it to Newtons

• physics -

The MOMENTUM of the runner, 120*7.5 = 900 kg m/s, exceeds the momentum of the tsacker in the opposite direction, 50*150 = 750 kg m/s
The net momentum will carry then forward when they are "stuck" together at the goal line.

• physics (typo) -

tsacker = tackler

• physics -

so they both stop exactly at the goalline or he scores? from what you said he scores

• physics -

I said "The net momentum will carry then forward when they are "stuck" together at the goal line."

Forward means across the goal line. Yes, it's a touchdown.