Find the kinetic friction of an object at an angle

In summary, the conversation discusses the calculation of kinetic friction in a scenario where a 87 lb box is being pulled by a rope with a force of 60 lb at a 15 degree angle to the horizontal. The coefficient of kinetic friction is given as .35 and the calculation involves finding the force of friction using the weight and angle of the box. The conversation also mentions the components of weight along and perpendicular to the plane, as well as the resultant force that gives rise to friction.
  • #1
Samantha Durrey
1
0
A box weighing 87 lb is being pulled with a rope that exerts a force of 60. lb at an angle of 15 degrees with the horizontal. If the coefficient of kinetic friction is .35, what is the kinetic friction?
 
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  • #2
This is a homework or coursework type problem. Please post it in the appropriate Homework forum and use the Homework Template.
 
  • #3
Hello,

you see in this case weight mg have two componets along the plane and prependicular to plane. component along the plane tries to bring weight down the slide and the other component pushes the plane. As this component push plane, plane would also push it with same force unless plain would have deprssed. This resultant gives rise to friction.
F = mgCos(alpha)
Rest you can calculate. Hope this one helps.
 

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1. What is kinetic friction?

Kinetic friction is the force that opposes the movement of an object in contact with a surface. It is caused by the microscopic roughness of surfaces and is always in the direction opposite to the movement of the object.

2. How is kinetic friction different from static friction?

Kinetic friction occurs when an object is already in motion, while static friction occurs when an object is at rest and trying to be set into motion. The force of static friction is generally greater than kinetic friction.

3. How can I calculate the kinetic friction of an object at an angle?

The formula for calculating kinetic friction at an angle is Fk = μkNcosθ, where μk is the coefficient of kinetic friction, N is the normal force, and θ is the angle between the surface and the object's direction of motion. Make sure to use consistent units for all variables.

4. What factors affect the kinetic friction of an object at an angle?

The coefficient of kinetic friction, the normal force, and the angle between the surface and the object's direction of motion all affect the kinetic friction of an object. The roughness of the surfaces and the weight of the object also play a role.

5. How can I reduce the kinetic friction of an object at an angle?

To reduce the kinetic friction of an object at an angle, you can try using a lubricant between the surfaces or making the surfaces smoother. You can also decrease the weight of the object or change the angle at which it is moving.

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