Posted by **clueless** on Wednesday, November 10, 2010 at 8:25pm.

Starting from rest, a 10.2 kg block slides 2.90 m down a frictionless ramp (inclined at 30.0° from the floor) to the bottom. The block then slides an additional 4.80 m along the floor before coming to a stop. Determine the coefficient of kinetic friction between block and floor.

- ap physics -
**bobpursley**, Wednesday, November 10, 2010 at 8:32pm
ap?

the block has mgh of PE when it starts, so at the bottom all that energy is kinetic.

Now, friction absorbs this energy, so

mu*mg*distance=mgh

solve for mu

Notice the distance is independent of mass. Neat experiment to show this.

- ap physics -
**Damon**, Wednesday, November 10, 2010 at 8:33pm
distance down = 2.9 sin 30 = 1.45 meter

Ke at bottom = U at top = m g h = m*g*1.45 Joules

Work done by friction = that KE

mu m g * 4.8

so

m*g*1.45 = mu m g *4.8

mu = 1.45/4.8

note m g cancels

- ap physics -
**Walter White**, Thursday, March 5, 2015 at 10:22am
I am the one who nocks just put that in

## Answer this Question

## Related Questions

- physics - Starting from rest, a 10.7 kg block slides 2.60 m down to the bottom ...
- physics - Starting from rest, a(n)9 kg block slides 9.7 m down a frictionless ...
- Physics - A block is placed on a frictionless ramp at a height of 14.5 m above ...
- physics - I am having great difficulty with this question. A block is placed on ...
- physics - Starting from rest, a 11.70 kg suitcase slides 3.14 m down a ...
- Physics - Starting from rest, a 11.50 kg suitcase slides 3.18 m down a ...
- Physics - block of mass 3.5 kg slides down frictionless incline that is 10 m ...
- physics - The 2 kg block in Figure 7-25 slides down a frictionless curved ramp, ...
- Physics - An 8.70 kg block slides with an initial speed of 1.56 m/s **down** a ...
- Physics - An 8.74-kg block slides with an initial speed of 1.52 m/s down a ramp ...

More Related Questions