# (Find time it takes a block to travel) Dynamics

1. Jun 4, 2012

### wildleaf

1. The problem statement, all variables and given/known data
How long would it take for the block to travel 10m starting from zero velocity? (i.e. T =?)
(Look the the attached picture for the block and the position of it on the plane at 45 degree and 10 m from ground with the same slope)

Theta = 45 degrees
m = 1.0 kg
f = 0.3 (Friction Factor)
L = 10 m

2. Relevant equations

3. The attempt at a solution

I know we have to use the Newton's law and we have to assume that v = 0 @ T = 0. But I do not how to do it.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. Jun 5, 2012

### Staff: Mentor

Draw a large diagram. Find the component of weight which acts perpendicularly to the slope. When you multiply this by 0.3 you have the friction force that acts along the slope.

That should get you started.

3. Jun 5, 2012

### wildleaf

Is this what you mean (look at the attached picture).

4. Jun 5, 2012

5. Jun 5, 2012

### Staff: Mentor

You haven't drawn the triangle that resolves the weight into two components: one perpendicular to the slope, the other parallel to it.