Question

You are using a rope to pull a box across a hardwood floor at constant speed....

You are using a rope to pull a box across a hardwood floor at constant speed.

a) Is the box in mechanical equilibrium? Explain.

b) Is the box accelerating? How do you know?

c) The mass of the box is 14 kg. The normal force exerted on the box by the ground is 120 N, and the friction force between the box and the floor is 20 N. What is the tension in the rope?

d) Sketch a force diagram for the box with all the forces labeled. Be careful about the relative sizes and directions of the force vectors in your diagram.

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

(a) Yes, the box is in mechanical equilibrium. In classical mechanics a body is said to be in mechanical equilibrium if the net force acting on it is zero. Since the body is moving with constant speed, the net force acting on it is 0, therefore it is in mechanical equilibrium.

(b) No, the box is not accelerating. Acceleration is chang in velocity per unit time. Since the box is being pulled at a constant speed, there is no change in velocity, therefore it is not accelerating.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 5.00 kg block sits on the floor at rest. You pull on a rope upwards...
A 5.00 kg block sits on the floor at rest. You pull on a rope upwards at an angle. The coefficient of static friction is 0.400 and the coefficient of kinetic friction is 0.300. When you pull upwards with a force of 20.0 N at an angle of 35.0°, what is the force of friction on the box? What is the acceleration of the box?
A 27 kg box is being dragged across a smooth floor by a rope for a...
A 27 kg box is being dragged across a smooth floor by a rope for a distance of 7 m. The rope is pulling with a tension of 35 N, directed 22 above the horizontal. What is the change in kinetic energy of the box?
A box, initially at rest, is pulled by a rope as it slides along a horizontal...
A box, initially at rest, is pulled by a rope as it slides along a horizontal (level) carpeted floor in the positive direction; there is friction. The mass of the box is 8 kg and the tension in the rope has a magnitude of 40 N. After 4 seconds of pulling, the box has a speed of 12 m/s. 1. While the box is being pulled: a. what is the magnitude of acceleration of the box? Answer: _________ b. what...
A rope is used to pull a box which has a mass of 2.03 kg above...
A rope is used to pull a box which has a mass of 2.03 kg above the floor as far as 4.56 m. The force of the rope F is 6 N in a direction that has an angle of 33.1 degrees above the floor surface. a. How much work does F do? b. What is the increase in thermal energy in a box-floor system? c. What is the kinetic friction coefficient between the box and the floor?
A box of mass 730 kg is being pulled at a constant speed across a rough...
A box of mass 730 kg is being pulled at a constant speed across a rough horizontal floor by a constant force, F. The angle of this force above the horizontal is such that the force you apply is a minimum (that is, the amount of force you need to move the box at a constant speed across the floor depends on the angle at which you pull - find the angle which the force is a minimum). Calculate the...
1) Two movers use ropes to pull a heavy box horizontally across a level floor. One...
1) Two movers use ropes to pull a heavy box horizontally across a level floor. One pulls with a force of 175.0 N at 20.0 degrees North of East, while the other pulls with 200.0 N at 10.0 degrees West of North. The box has a mass of 125.0 kg, and has coefficients of friction (with the floor) static= 0.350 kinetic= 0.220. a) In what direction is the friction force acting? b) The box is initially stationary. What is its...
At the airport, you pull a 20 kg suitcase across the floor with a strap that...
At the airport, you pull a 20 kg suitcase across the floor with a strap that is at an angle of 50 ∘ above the horizontal. A) Find the normal force, given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.34. B) Find the tension (in Newtons) in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the...
For each of the following situations, draw the forces exerted on the moving object and identify...
For each of the following situations, draw the forces exerted on the moving object and identify the other object causing each force. Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded. A.)You pull a wagon along a level floor to the right using a rope oriented 45∘ above the horizontal. Draw a force diagram for the wagon. B.)A bus moving on a...
An initially stationary box of sand is to be pulled across a floor by means of...
An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 883 N. The coefficient of static friction between the box and the floor is 0.360. (a) What should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand, and (b) what is the weight of the sand and box in that situation?
A 55-kg packing crate is pulled with constant speed across a rough floor with a rope...
A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 41.0 ∘ above the horizontal. If the tension in the rope is 175 N , how much work is done on the crate by the rope to move it 9.0 m ?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT