Question 1: A 71 Newton toolbox is dragged horiztonally at constant speed by a r

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Question 1:

A 71 Newton toolbox is dragged horiztonally at constant speed by a rope making an angle of 20 degrees with the floor. The tension in the rope is 48 newtons. Determine the magnitude of the friction force and the normal force.

Friction Force = ____ [Num]_____ [Units]

Normal Force =  [Num] [Units]

Question 2:

Large boxes of pumpkins are set on a ramp to be unloaded out of a truck. The 80 pound boxes are set on the ramp which has an incline of 35 degrees. They must be pushed down the incline to reach the bottom. If the coefficient of static friction between the boxes and the ramp is 0.8, with what force down the incline must the box be pushed to move it to the bottom?

Applied Force = ____[Num]____ [Units]

Question 3:

Assume a flat surface where the coefficient of static friction is 0.75 and the coefficient of kinetic friction is 0.31. What horizontal force is needed to start the motion of a 50 Newton block moving along a wooden floor? What force will move it at constant speed?

Force to begin motion = ____ [Num] ____[Units]

Force to sustain motion = ____ [Num] ____[Units]

Question 4:

Calculate the normal force on a body if the force of kinetic friction is 9.6 lbs and the coefficient of kinetic friction friction is .400.

Question 5:

Calculate the Normal force on a body if the force of static friction is 8 N and the coefficient of static friction is .667

A 71 Newton toolbox is dragged horiztonally at constant speed by a rope making an angle of 20 degrees with the floor. The tension in the rope is 48 newtons. Determine the magnitude of the friction force and the normal force.

Friction Force = ____ [Num]_____ [Units]

Normal Force =  [Num] [Units]

Question 2:

Large boxes of pumpkins are set on a ramp to be unloaded out of a truck. The 80 pound boxes are set on the ramp which has an incline of 35 degrees. They must be pushed down the incline to reach the bottom. If the coefficient of static friction between the boxes and the ramp is 0.8, with what force down the incline must the box be pushed to move it to the bottom?

Applied Force = ____[Num]____ [Units]

Question 3:

Assume a flat surface where the coefficient of static friction is 0.75 and the coefficient of kinetic friction is 0.31. What horizontal force is needed to start the motion of a 50 Newton block moving along a wooden floor? What force will move it at constant speed?

Force to begin motion = ____ [Num] ____[Units]

Force to sustain motion = ____ [Num] ____[Units]

Question 4:

Calculate the normal force on a body if the force of kinetic friction is 9.6 lbs and the coefficient of kinetic friction friction is .400.

Number Units

Question 5:

Calculate the Normal force on a body if the force of static friction is 8 N and the coefficient of static friction is .667

Number Units

Explanation / Answer

1)71-48 sin 20=N=54.58N

48 cos 20= frictional force= 45.11

2)80 pounds=36.287kg

36.287 cos 35x 0.8 - 36.287 sin 35= Force applied

23.779- 20.813= 2.966N

3) Force to start it= 50x 0.75= 37.5N

Force to give it constant speed= 50 x 0.31= 15.5N

4)Friction=uN= 0.4N= 9.6=24lbs

5)Friction= uN=0.667N=8

N= 11.994N

where N is the normal reaction

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