Question

A 52.1-kg crate rests on a level floor at a shipping dock. The coefficients of static...

A 52.1-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.649 and 0.386, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Coefficient of static friction is defined as   

Coefficient of kinetic friction is defined as

Where N is the force due to gravity, which is directed upward.

and are the force due to static and kinetic friction.

(a) The horizontal pushing force is required to just start the crate moving is

a) The horizontal pushing force is required to slide the crate across the dock at a constant speed

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 large crate with mass m rests on a horizontal floor. The static and kinetic coefficients...
A large crate with mass m rests on a horizontal floor. The static and kinetic coefficients of friction between the crate and the floor are μs and μk, respectively. A woman pushes downward on the crate at an angle θ below the horizontal with a force F⃗ . What is the magnitude of the force vector F⃗  required to keep the crate moving at constant velocity? If μs is greater than some critical value, the woman cannot start the crate moving...
A 12-kg crate rests on a horizontal surface and a boy pulls on it with a...
A 12-kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30o below the horizontal. If the coefficient of static friction is 0.40, the minimum magnitude of the force the boy needs to start the crate moving is:
A crate of 31.6-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal...
A crate of 31.6-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 309 N . After that you must reduce your push to 248 N to keep it moving at a steady 22.0 cm/s What is the coefficient of static friction between the crate and the floor? What is the coefficient of kinetic friction between the crate and the floor?...
A crate of 41.3-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal...
A crate of 41.3-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 337 N . After that you must reduce your push to 202 N to keep it moving at a steady 20.0 cm/s . Part A.) What is the coefficient of static friction between the crate and the floor? (static fraction=???) Part B.) What is the coefficient of kinetic...
Static and Kinetic Friction A 25 kg crate is placed on a concrete surface. If the...
Static and Kinetic Friction A 25 kg crate is placed on a concrete surface. If the coefficient of static friction is 0.60, how much horizontal force is needed to push the crate from rest? If it takes a horizontal force of 78 N to keep the crate moving at constant velocity, what is the coefficient of kinetic friction?
A 69 kg crate is dragged across a floor by pulling on a rope attached to...
A 69 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 12° above the horizontal. (a) If the coefficient of static friction is 0.46, what minimum force magnitude is required from the rope to start the crate moving? (b) If μk = 0.36, what is the magnitude of the initial acceleration (m/s^2) of the crate?
A 25 kg crate is placed on a concrete surface. If the coefficient of static friction...
A 25 kg crate is placed on a concrete surface. If the coefficient of static friction is 0.60, how much horizontal force is needed to push the crate from rest? If it takes a horizontal force of 78 N to keep the crate moving at constant velocity, what is the coefficient of kinetic friction?
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...
In this example we will calculate the coefficients of static and kinetic friction using two equations...
In this example we will calculate the coefficients of static and kinetic friction using two equations along with Newton’s second law of motion. Suppose that a delivery company has just unloaded a 500 N crate full of home exercise equipment in your level driveway. You find that to get it started moving toward your garage, you have to pull with a horizontal force of magnitude 230 N. Once the crate “breaks loose” and starts to move, you can keep it...
A 43.4-kg crate rests on a horizontal floor, and a 72.9-kg person is standing on the...
A 43.4-kg crate rests on a horizontal floor, and a 72.9-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT