Determine the frictional force acting on the box

In summary, to determine the magnitude of the frictional force acting on the box on the plane, first draw a free body diagram and determine the forces in each direction. Then, use the equation f=ma to find the frictional force. The angle in this problem is 60 degrees, and the coefficients of kinetic and static friction are given as .15 and .30 respectively.
  • #1
physicsgurl12
184
0

Homework Statement




determine the magnitude of the frictional force acting on the box on the plane

Homework Equations


f=ma


The Attempt at a Solution


no clue. help ??
 

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  • #2
*imagines there is a support for the slanted green line*

Free Body Diagram, let's go. And we should do this question before you tackle on that tension problem
 
  • #3
the tension was part a. this is part b. the force diagram would be the same as the other but without the force of the rope.
 
  • #4
Since we are determining friction the equation for the force of friction is required, and in this case so is the angle...
 
  • #5
Zula110100100 said:
Since we are determining friction the equation for the force of friction is required, and in this case so is the angle...

well there isn't an angle?
 
  • #6
I am confused then, can you please give us all known variable? If it is the same as the other thread is the angle not also the same at 60degrees?
 
  • #7
the whole problem reads this. two 10 kilogram boxes are connected by a massless string that passes ocer a massless frictionless pulley as shown above( this would be the picture on the other problem) The boxes remaine at rest, with one on the right hanging vertically and the one on the left 2.0meters from the bottom of an inclined plane that makes an angle of 60 degrees with the horizontal. The coefficients of kinetic friction and static friction between the left hand box and the plane are .15 and .30 respectively. You may use g=10m/s^2, sin60=.87, and cos60=.50
a. what is the tension T in string
b. On the diagram below draw and label all forces acting on the box that is on the plane.
c. determine the magnitude of the frictional force acting on the box on the plane.
 
  • #8
So the angle is indeed 60, I would start by determining the forces on the box in each direction(i.e. parallel to the plane, normal to the plane)
 

1. What is frictional force?

Frictional force is a force that opposes the motion of an object when it comes into contact with another object or surface.

2. How is frictional force calculated?

Frictional force is calculated by multiplying the coefficient of friction, which is a measure of how rough the two surfaces are, by the normal force, which is the force exerted by the object on the surface it is in contact with.

3. What factors affect the amount of frictional force?

The amount of frictional force is affected by the type of surfaces in contact, the normal force, and the coefficient of friction.

4. How does frictional force impact motion?

Frictional force can decrease the speed of an object in motion and can also cause the object to come to a complete stop.

5. How can frictional force be reduced?

Frictional force can be reduced by using lubricants, using smoother surfaces, and reducing the normal force between the two surfaces.

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