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Horizontal Pulley Question [Forces]

  • Thread starter harujina
  • Start date
  • #1
77
1

Homework Statement



An object is hanging by a [mass-less] string on a [mass-less] pulley from a cart on a desk with a mass of 1.8 kg. The cart has an acceleration of 2.5 m/s^2. Calculate the mass of the hanging object given that:

a) There is no friction.
b) There is a frictional force of 0.4 N on the wheels of the cart.

Homework Equations



Fnet = ma

The Attempt at a Solution



m1 = 1.8 kg
a = 2.5 m/s^2
m2 = ?

I don't know where to start with this question...
Maybe Fnet = (1.8 kg)(2.5 m/s^2) = 4.5 N ? But what would I do with this.
... I don't know.
 

Answers and Replies

  • #2
56
2
What do you think the acceleration of the falling object is?
 
  • #3
77
1
Isn't it the same?
 
  • #4
56
2
Perhaps, think about a force diagram. You have one force going downward and one upward. Draw it out, then solve for your unknown.
 

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