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Posted by 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 - , 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 - , Tuesday, April 1, 2008 at 10:12pm

    b/c the 120 guy is going faster

  • I don't understand - , 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 - , Tuesday, April 1, 2008 at 10:20pm

    Momentum is M V. I multiplied M times V.

  • I don't understand - , Tuesday, April 1, 2008 at 10:29pm

    I did the wrong numbers. I changed it to Newtons

  • physics - , 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) - , Tuesday, April 1, 2008 at 10:21pm

    tsacker = tackler

  • physics - , 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 - , 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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