# Physics

posted by .

A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2.

1. Find the friction force impeding its notion?

2. What is the coefficient of kinetic friction?

*Are we dealing with Kinetic or Static Friction...this will effect coefficient correct?
*The equation coefficient*m*g*cos angle DOES NOT give you the friction force

• Physics -

Wb = m*g = 13kg * 9.8N/kg = 127.4 N. =
Wt. of box.

Fb = 127.4N @ 33 Deg. = Foce of box.
Fp = 127.4*sin33 = 69.4 N. = Force parallel to incline.
Fv = 127.4*cos33 = 106.8 N. = Force perpendicular to incline.

1. Fn = Fp - Fk = ma
69.4 - Fk = 13 * 0.20 = 2.6
-Fk = 2.6 -69.4 = -72
Fk = 72 N = Force of kinetic friction.

2. u*Fv = Fk
127.4u = 72
u = 72 / 127.4 = 0.565 = Coefficient of
kinetic friction.

• Physics -

Correction:

-Fk = 2.6 - 69.4 = -66.8Fk = 66.8 N.

2. u*Fv = Fk
127.4u = 66.8
u = 66.8 / 127.4 = 0.524 = uk.

• Physics -

OOPs!
2. u*Fv = Fk
1o6.8u = 66.8
u = 66.8 / 106.8 = 0.625.

NOTE: Fv = 106.8 N.

## Similar Questions

1. ### Physics

A 24 kg box is released on a 21 degree incline and accelerates down the incline at 0.27 m/s^2. a) Find the friction force impeding its motion. b) What is the coefficient of kinetic friction?
2. ### physics

A 11.0 box is released on a 37 incline and accelerates down the incline at 0.25 .What is the coefficient of kinetic friction in units uk?
3. ### AP Physics

An 18.0 kg box is released on a 35.0° incline and accelerates down the incline at 0.269 m/s2. Find the friction force impeding its motion. How large is the coefficient of friction?
4. ### Accelerated Physics

An 18.0 kg box is released on a 35.0° incline and accelerates down the incline at 0.269 m/s2. Find the friction force impeding its motion. How large is the coefficient of friction?
5. ### Physics

A 15.0 kg box is released on a 32 degree incline and accelerates down the incline at 0.30m/s sqaured ?
6. ### physics

A 23.0 kg box is released on a 39.0° incline and accelerates down the incline at 0.268 m/s2. Find the friction force impeding its motion.
7. ### Physics

A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at o.20 m/s^2. A. Find the friction force impeding it's motion B. What is the coefficient of kinetic friction
8. ### Physics

A 13.0 -kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2 What is the coefficient of kinetic friction?
9. ### physics

A 5-kg box is released on a 30 degree incline and accelerates down the incline at 2.79 m/s^2. To the nearest tenth of a Newton, what is the friction force impeding its motion?
10. ### Physics

An 17.2 kg box is released on a 35.7° incline and accelerates down the incline at 0.274 m/s2. Find the friction force impeding its motion. (in N) How large is the coefficient of friction?

More Similar Questions