Homework Help: physics

Posted by Jon on Tuesday, April 1, 2008 at 10:01pm.

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 - drwls, Tuesday, April 1, 2008 at 10:08pm
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 - Jon, Tuesday, April 1, 2008 at 10:12pm
b/c the 120 guy is going faster
I don't understand - Jon, Tuesday, April 1, 2008 at 10:17pm
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 - drwls, Tuesday, April 1, 2008 at 10:20pm
  Momentum is M V. I multiplied M times V.
- I don't understand - Jon, Tuesday, April 1, 2008 at 10:29pm
  I did the wrong numbers. I changed it to Newtons
physics - drwls, Tuesday, April 1, 2008 at 10:18pm
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) - drwls, Tuesday, April 1, 2008 at 10:21pm
  tsacker = tackler
physics - Jon, Tuesday, April 1, 2008 at 10:24pm
so they both stop exactly at the goalline or he scores? from what you said he scores
- physics - drwls, Wednesday, April 2, 2008 at 6:30am
  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.

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