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- Thread starter TyErd
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- #2

rl.bhat

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You can find the acceleration of the object by using

vf^2 = vi^2 + 2*a*s. vi and s is given. Find a.

This acceleration has two components. One the component of g which acts in the downward direction. And the other due to braking force, which acts in the opposite direction of the motion. In the diagram sinθ is given. (10/100).

Write down the expression for the acceleration and solve the problem..

- #3

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um to find acceleration cant you use a=gsinθ, but if you use that its 10xsin(5.740) which equaks 1.001 because if sinθ=10/100 then θ=5.74. However if I use your equation i get a=4.5m/s/s

- #4

rl.bhat

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The acceleration a is correct.

Now a = af - g*sinθ, where af is the acceleration due to frictional force.

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how do i calculate af?

- #6

rl.bhat

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In the problem they have askedhow do i calculate af?

So you have find af, then the braking force = m*af.

You have found a and g*sinθ. Using the above equation find af.

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so is af = 4.500 - 1.001?, then the braking force is 1000*3.499=3499???????????????

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so then what is the driving force?

- #9

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is it just 1000N?

- #10

rl.bhat

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This step is wrong.so isaf = 4.500 - 1.001?, then the braking force is 1000*3.499=3499???????????????

af = a + g*sinθ.

Αnd what do you mean by driving force?

Sledge moves down due to gravitational force. The frictional force stops it.

- #11

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whats the difference between a and gsinθ?

- #12

rl.bhat

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mg*sinθ ......> Force acting on the sledge due to gravity in the downward directionwhats the difference between a and gsinθ?

μ*mg*cosθ.......>Frictional force in the upward direction = m*af

Net retarding force acting on the sledge is

mg*sinθ - m*af = - m*a.

- #13

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ok we calculated before that gsinθ = 1.001. so thats the acceleration downwards direction. then we calculated a to be 4.500 using that equation. why are they different when there both acceleration?

- #14

rl.bhat

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When you are using the equation vf^2 = vi^2 + 2*a*s. to find a, you are getting the acceleration -4.5 ms^-2. whereas g*sinθ +1. There directions are different.

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