FORCES Types of Friction, Newton’s Laws of Motion, Gravity, and Types of Forces.
Friction Friction results from relative motion between objects. Frictional forces are forces that...
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Transcript of Friction Friction results from relative motion between objects. Frictional forces are forces that...
Friction Friction results from relative
motion between objects. Frictional forces are forces that
resist or oppose motion.
Coefficient of friction ()
—Feet on rocks = large
—Polar bear on ice = small
Friction(A Fun Formula)
Ff = Fnfun
get it?
Friction(A Fun Formula)
Ff = Fn
Normal force (N)
Coefficient of frictionNo units!
Friction force (N)
Friction
Ff = Fn=FfFnFn =
Ff /
To solve for frictional force
To solve for normal force
To solve for coefficient of friction
Calculate force of friction
A box weighs 100 N (Fn).
As the box is pushed horizontally, the coefficient of sliding friction is 0.25.
Determine the force of friction resisting the motion.
To solve for frictional force:
Ff = Fn
Fn = 100 N Ff = (0.25)(100 N) Ff = 25 N