Log in
Physics
1
answer
0
watching
372
views

A block is resting on a wooden plank. There is a hinge on one end of the plank which allows the other end to be lifted to create an angle,  , with respect to the horizontal as shown in the figure. The coefficient of static friction between the block and the plank is  

Part (a) Please select the correct Free Body Diagram, where Fg, is the force due to gravity, N is the normal force, and Fr, is the static friction force. 

Part (b) The angle A is slowly increased. Write an expression for the angle at which the block begins to move in terms of . 

Part (c) If a student measures that the block begins to move at an angle of = 22°, what is the numerical value of the coefficient of static friction, ?

Watch
1
answer
0
watching
372
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Tauseef Shaikh
Tauseef ShaikhLv10
23 Mar 2021

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A 2.0 kg box rests on a plank that is inclined at an angle of 65 degrees above the horizontal. The upper end of the box is attached to a spring with a force constant of 360 N/m, as shown in the figure .If the coefficient of static friction between the box and the plank is 0.26, what is the maximum amount the spring can be stretched and the box remain at rest?

A block of mass m lies on a horizontal table. The coefficient of static friction between the block and the table is μs. The coefficient of kinetic friction is μk, with μk<μs.

Part A

If the block is at rest (and the only forces acting on the block are the force due to gravity and the normal force from the table), what is the magnitude of the force due to friction?

Part B

Suppose you want to move the block, but you want to push it with the least force possible to get it moving. With what force F must you be pushing the block just before the block begins to move?

Express the magnitude of F in terms of some or all the variables μs,μk, and m, as well as the acceleration due to gravity g.

Part C

Suppose you push horizontally with half the force needed to just make the block move. What is the magnitude of the friction force?

Express your answer in terms of some or all of the variables μs, μk, and m, as well as the acceleration due to gravity g.

Part D

Suppose you push horizontally with precisely enough force to make the block start to move, and you continue to apply the same amount of force even after it starts moving. Find the acceleration a of the block after it begins to move.

Express your answer in terms of some or all of the variables μs, μk, and m, as well as the acceleration due to gravity g.

Learning Goal: To understand kinetic and static friction.

A block of mass M lies on a horizontal table. The coefficient ofstatic friction between the block and the table is us. Thecoefficient of kinetic friction is uk, with uk<us .
A.If the block is at rest (and the only forces acting on the blockare the force due to gravity and the normal force from the table),what is the magnitude of the force due to friction?

Part B
Suppose you want to move the block, but you want to push it withthe least force possible to get it moving. With what force F mustyou be pushing the block just before the block begins tomove?
Express the magnitude of in terms of some or all the variables f,us,uk, and m, as well as g the acceleration due to gravity .

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in