Question

A factory worker moves a 21.0 kg crate a distance of 4.80 m along a level...

A factory worker moves a 21.0 kg crate a distance of 4.80 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.300.

What magnitude of force must the worker apply? (N)

How much work is done on the crate by the worker's push? (J)

How much work is done on the crate by friction? (J)

How much work is done by the normal force? (J)

How much work is done by gravity? (J)

What is the net work done on the crate? (J)

Homework Answers

Answer #1

Part A

Using force balance

Fnet = Fw + Ff = 0

Fw = -Ff

Fw = -(-uk*m*g)

Fw = force applied by worker = 0.30*21*9.8 = 61.74 N

Part B

Workdone by worker

W = F.d = F*d*cos theta

theta = angle between force and distance = 0 deg

Ww = 61.74*4.80*cos 0 deg = 296.36 J

Part C.

Wf = Ff*d*cos theta

for friction force, theta = 180 deg

Wf = 61.74*4.80*cos 180 deg = -296.35 J

Part D

theta = angle between normal force and distance = 90 deg

Cos 90 deg = 0

Wn = Fn*cos 90 deg = 0 J

Part E

theta = angle between gravity and distance = 90 deg

Cos 90 deg = 0

Wn = Fg*cos 90 deg = 0 J

Part F

Wnet = Ww + Wf + Wn + Wg

Wnet = 296.35 + (-296.35) + 0 + 0 = 0 J

Please Upvote.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A factory worker moves a 29.0 kg crate a distance of 5.30 m along a level...
A factory worker moves a 29.0 kg crate a distance of 5.30 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.300. a) What magnitude of force must the worker apply? b) How much work is done on the crate by the worker's push? c) How much work is done on the crate by friction? d) How much work is done by the normal...
A factory worker pushes a 30.0-kg crate a distance of 4.50 m along a level floor...
A factory worker pushes a 30.0-kg crate a distance of 4.50 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.250. 17 (a) What magnitude of force must the worker apply? (b) How much work is done on the crate by this force? (c) How much work is done on the crate by friction? (d) How much work is done by the normal force?...
A factory worker pushes a 29.8 kg crate a distance of 5.0 m along a level...
A factory worker pushes a 29.8 kg crate a distance of 5.0 m along a level floor at constant velocity by pushing downward at an angle of 30 ∘ below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26. 1.What magnitude of force must the worker apply to move the crate at constant velocity? 2.How much work is done on the crate by this force when the crate is pushed a distance of 5.0 m...
A factory worker pushes a 29.8 kg crate a distance of 5.0 m along a level...
A factory worker pushes a 29.8 kg crate a distance of 5.0 m along a level floor at constant velocity by pushing downward at an angle of 30 ∘ below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26. 1.What magnitude of force must the worker apply to move the crate at constant velocity? 2.How much work is done on the crate by this force when the crate is pushed a distance of 5.0 m...
A factory worker pushes a crate of mass 30.9 kg a distance of 4.10 m along...
A factory worker pushes a crate of mass 30.9 kg a distance of 4.10 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.26. Part A) What magnitude of force must the worker apply? Express your answer using two significant figures. Part B) How much work is done on the crate by this force? Express your answer using two significant figures. Part C) How much...
a factory worker pushes a crate of mass 28.2kg a distance of 4.70m aong a level...
a factory worker pushes a crate of mass 28.2kg a distance of 4.70m aong a level floor at constant velocity by pushing horizontally on it. the coefficient of kinetic friction between the crate and the floor is .24. A) what magnitude of the force must the wprker apply? B) how much work is done on the crate by this force? c)how much work is done on the crate by friction?? d)how much work is done by the normal force? e)...
A worker pushes a 27.0kg crate a distance 9.50m along a level floor at constant speed...
A worker pushes a 27.0kg crate a distance 9.50m along a level floor at constant speed by exerting a pushing force on the crate which is directed 35.0◦ below the horizontal. The coefficient of kinetic friction is 0.230. (a) How much work did the worker do on the crate? Now the worker pushes the same crate up a 35.0◦ incline at constant speed, with the same kinetic friction coefficient. This time the worker pushes horizontally on the crate. Over the...
A worker pushes horizontally on a 600-N shipping container. The container moves across a warehouse floor...
A worker pushes horizontally on a 600-N shipping container. The container moves across a warehouse floor at a constant velocity of 0.8m/s. The coefficient of kinetic friction between the crate and floor is 0.3. What is the magnitude of the worker's force in N? PLEASE SHOW STEP BY STEP I AM SO CONFUSED
A worker pushed a 36.0 kg block 6.60 m along a level floor at constant speed...
A worker pushed a 36.0 kg block 6.60 m along a level floor at constant speed with a force directed 23.0° below the horizontal. If the coefficient of kinetic friction between block and floor was 0.400, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system?
To pull a 36 kg crate across a horizontal frictionless floor, a worker applies a force...
To pull a 36 kg crate across a horizontal frictionless floor, a worker applies a force of 230 N, directed 18° above the horizontal. As the crate moves 1.6 m, what work is done on the crate by (a) the worker's force, (b) the gravitational force on the crate, and (c) the normal force on the crate from the floor? (d) What is the total work done on the crate?