- #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?
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.
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.
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.
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.
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.