Homework Help: Physics

Posted by Sammy on Saturday, October 27, 2012 at 5:50pm.

A 35 kg box rest in the bed of a truck. The coefficient of static friction between the box and the truck bed is 0.30 and the coefficient of friction of kinetic friction is 0.10.

A) Calculate the maximum acceleration the truck can have before the box slides backwards.

B) The truck just exceeds the maximum acceleration that prevents the box from sliding backwards. Calculate the acceleration of the box.

Physics - Henry, Sunday, October 28, 2012 at 8:42pm
Wb = m*g = 35kg * 9.8N/kg = 343 N. = Wt.
of box.

Fb = 343N @ 0o.
Fp=343*sin(0) = 0.=Force parallel to bed
Fv = 343*cos(0) = 343 N. = Force perpendicular to bed.

Fs = u*Fv = 0.3*343 = 102.9 N. = Force of static friction.

A. Fn = Fp - Fs = m*a.
0 - 102.9 = 35*a
qa = -2.94 m/s^2.

B. Fk = u*Fv = 0.1*343 = 34.3 N.
Fp - Fk = m*a.
0-34.3 = 35*a
a = -0.98 m/s^2.

Answer this Question

Related Questions

physics - A 22 kg box rests on the back of a truck. The coefficient of static ...
physics - A large box is loaded into the very back of a pickup truck and is not ...
Physics - A box rests on the back of a truck. The coefficient of static friction...
Physics - A box rests on the back of a truck. The coefficient of static friction...
physics - A person pulls with a force of 40 N on two boxes at rest. The top box ...
physics - A person pulls with a force of 40 N on two boxes at rest. The top box ...
physics - A crate of mass 96 kg is loaded onto the back of a flatbed truck. The ...
physics - A crate of mass 97 kg is loaded onto the back of a flatbed truck. The ...
physics - A wooden box with a mass of 10.0kg rests on a ramp that is inclined at...
Physics - A box with a mass of 7.00 kg is at rest on a ramp that is at an angle ...

For Further Reading

First Name:
School Subject:
Answer: