5.2 Friction

Friction is a force that may slow down an object 😑

Force of friction is always perpendicular to the _____

What are the factors that friction depends on? [Tick all the correct answers]! 😎

Okaaay. Can you tell me when is friction more? 😜

What are the two types of friction? [Tick all the correct answers]!

____________is the force exerted on one surface by another when they are rubbed and one of the surfaces or both are moving.

____________ is the force exerted on one surface by another when there is no motion.

Frictional force (F_f) is ____________ to normal force (F_N).

Examine the graph and mention which surface has the maximum coefficient of kinetic friction?

Equation for coefficient of kinetic friction can be given as:

________________

Equation for coefficient of static friction can be given as:

________________

The SI unit of coefficient of kinetic and static friction is ________

You need to move a 105 kg sofa to a different location in the room. It takes a force of 102 N to start it moving. What is the coefficient of static friction between the sofa and the carpet? 😊

A girl exerts a 36 N horizontal force as she pulls a 52 N sled across a cement sidewalk at constant speed. What is the coefficient of kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance. 😝