What is the coefficient of friction between the block and the incline?
The coefficient of static friction between the block and the incline is μs = 0.
What is the coefficient of kinetic friction ΜK between the block and the surface?
The co-efficient of kinetic friction, μk , between the floor and the block is 0.2.
How does ΜK compare to μs?
The coefficient of static friction μs characterizes friction when no movement exists between the two surfaces in question, and the kinetic coefficient μk characterizes friction where motion occurs. The static friction force must be overcome by an applied force before an object can move.
Which is greater μs or ΜK?
Since the objects are at rest with one another, more molecular bonds are able to form making the object harder to move and so greater force is needed to start motion when compared to the kinetic friction case. Therefore µs is generally greater than µk.
Does surface area affect friction?
The force due to friction is generally independent of the contact area between the two surfaces. Note that this relationship breaks down when the surface area gets too small, since then the coefficient of friction increases because the object may begin to dig into the surface.
Why does surface area affect friction?
The more atoms that are interacting in the two surfaces, the greater the total frictional force. Greater contact area means greater frictional force. If the contact area is proportional to the normal force, then this looks just like Amontons’ Law with the frictional force proportional to the normal force.
When two surfaces are coated with a lubricant then they?
If two surfaces are coated with lubricant then friction will be reduced so they can slide over each other if one is pushed on the other. It is friction which prevents relative motion between two surfaces.
When a body moves on a surface the force which tries to stop it from moving is the?
ANS: Friction is that force which opposes the relative motion between the two surfaces that are in contact with each other.
How can we reduce friction list any two ways?
Methods for decreasing friction:
- Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
- Lubrication is another way to make a surface smoother.
- Make the object more streamlined.
- Reduce the forces acting on the surfaces.
- Reduce the contact between the surfaces.