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March 29, 2017

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I was wondering if you can help me with these two questions. Thank you
Question # 1
A horse is pulling a heavy cart up a hill. The cart has 400 kg of mass inside it. The horse is pulling the cart with 10 N of force. What is the magnitude of the force on the horse due to the cart?

Question # 2





Question # 2
A car of mass 500 kg going 20 m/s collides with a car of 750 kg at rest. Which of the following statements are true? (Select all that are true.)

a) The car at rest feels the greater force.

b) the car that is moving feels the greater force


c) The two cars feel the same magnitude of force.

d) The two cars have the same acceleration due to the collision.

e)The car at rest has the greater acceleration due to the collision.



The car that is moving has the greater acceleration due to the collision.

  • @damon physics - ,

    Newton's third law is action is equal and opposite to reaction. Therefore 10 N
    (That is way too little to pull a cart though.)

  • @damon physics - ,

    The two cars see the same force (Third law again

    the lighter car will accelerate more
    Mbig A big = m small a small

  • @damon physics - ,

    some of the possible answers to question # 1 is
    4000n,10n,40n, not enough info or none of the above, would you recommend none of the above ?

  • @damon physics - ,

    for question # 2 you woud say the only answer would be that the lighter car has a greater acceertion due to the collison?

  • @damon physics - ,

    No, c alone. Both have the same force
    the light one has greater acceleration. That is not one of your choices.

  • @damon physics - ,

    10 N is correct for the first one. Of course there is no way 10N will pull the cart. You probably weigh about m g = 60*9.8 = 588 N

  • @damon econ - ,

    okay . and for question # 1 you woud recommonded choosing none of the above correct ?

  • @damon physics - ,

    for question 1, 10 N is correct.
    Unlikely but correct.

  • @damon physics - ,

    damon, does the car that weighs 500kg have more acceleration? if so, would e be correct then?

    here's the bottom three choices again:
    c. The two cars have the same acceleration due to the collision.
    d. car at rest has the greater acceleration due to the collision.
    e. The car that is moving has the greater acceleration due to the collision.

  • @damon physics - ,

    what you wrote was:

    " e)The car at rest has the greater acceleration due to the collision. "

    That is wrong.

    Now you have changed the wording of e so it is right.

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