# Physics

A 4 kg block slides down a rough inclined plane inclined at 30° with the horizontal. Determine the coefficient of kinetic friction between the block and the surface if the block has an acceleration of 1.2 m/s2.

1. 👍 0
2. 👎 0
3. 👁 177
1. Do you still need help?

1. 👍 0
2. 👎 0
2. M*g = 4 * 9.8 = 39.2 N.

Fp = 39.2*sin30 = 19.6 N. = Force parallel to the incline.

Fn = 39.2*Cos30 = 33.9 N. = Normal force.

Fk = u*Fn = u*33.9 = 33.9u.

Fp-Fk = M*a.
19.6 - 33.9u = 4 * 1.2
-33.9u = 4.8-19.6 = -14.8
u = 0.437.

1. 👍 0
2. 👎 0
posted by Henry

## Similar Questions

1. ### physics

An block of mass m , starting from rest, slides down an inclined plane of length L and angle θ with respect to the horizontal. The coefficient of kinetic friction between the block and the inclined surface is μ1 . At the bottom

asked by Anonymous on October 15, 2013
2. ### physics

An block of mass m , starting from rest, slides down an inclined plane of length L and angle θ with respect to the horizontal. The coefficient of kinetic friction between the block and the inclined surface is μ1 . At the bottom

asked by Anonymous on October 15, 2013
3. ### Physics

A 4 kg block slides down a rough inclined plane inclined at 30° with the horizontal. Determine the coefficient of kinetic friction between the block and the surface if the block has an acceleration of 1.2 m/s2.

asked by La La on September 30, 2012
4. ### Physics

An block of mass , starting from rest, slides down an inclined plane of length and angle with respect to the horizontal. The coefficient of kinetic friction between the block and the inclined surface is . At the bottom of the

asked by sied on October 10, 2013
5. ### Physics

A block of mass 0.5 kg rests on a smooth inclined plane. It is then pushed by a horizontal force of 16N. When the block has displaced 5m along the inclined plane. What would be the speed of the block if the plane is rough and a

asked by Alex on December 5, 2010
6. ### Physics-Conversion of Energy

Can someone help me solve this problem with all of the steps? This is from an online homework assignment but it doesnt have anything like it in the practice example. It asks to NOT use Newton's Law. An object is on Earth with a

asked by Light on November 29, 2018
7. ### Physics

A block P of mass 2.75 kg is lying on a rough inclined plane of angle è=0.87 radians. Block P is attached via a model string that passes over a model pulley to a second block Q of unknown mass M kg hanging vertically. The

asked by Anonymous on March 6, 2012
8. ### Physics - Mechanics

A small block of mass 1.2 kg is launched by a compressed spring with force constant k=600 N/m. The initial compression of the spring is 0.15 m. The block slides along a horizontal frictionless surface and then up an inclined plane

asked by Anonymous on March 13, 2015
9. ### Physics - Mechanics

A small block of mass 1.2 kg is launched by a compressed spring with force constant k=600 N/m. The initial compression of the spring is 0.15 m. The block slides along a horizontal frictionless surface and then up an inclined plane

asked by Anonymous on March 14, 2015
10. ### science

A steel block weighing 12N is pulled up an incline plane 20° above the horizontal by a constant force of 7.35 N which makes an angle of 10° above the inclined plane. The block stars from rest and is pulled 2.0m along the

asked by John on June 20, 2018

More Similar Questions