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Forces are vectors.
Fnet is the total of all forces which means to find Fnet you must add the forces together, the resultant is Fnet.
Fg = force of gravity
Fg = mg where m is mass in kg, g is accel due to gravity = 9.8 m/s2 on Earth
normal force (Fn) which exerted BY A SURFACE to support an object and is ALWAYS 90o TO THE SURFACE.
Ff = Fn
Ff = Fn where is the coefficient of friction, a unitless measure which describes how much adhesion there is between surfaces (how sticky they are). Large values of
are close to 1 small values close to zero.
Find the normal force andThe force down slope acting on a car on an 8o
slope if the car has mass 2000kg
also find Ff if = 0.10.
Force Vectors
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acting on a car on an 8o
slope if the car has mass 2000kg
also find Ff if = 0.10.
Ff always opposes motion! Ff will be in the opposite direction of Fdown
Find the car's acceleration
ACCELERATION ON RAMPS
A
A cat of mass 5.0 kg is on a ramp inclined at 30o, if the coefficient of friction of 0.25 exists whatIs the force down the ramp, Ff and the cat's acceleration?
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Coefficients of friction have high values approaching 1, (over 1 means its easier to
lift the object than to slide it) low values of approach zero.
Suspended objects: will use 2 cables (ropes) to offset the force of gravity
so that The net force (Fnet) = 0 N
RAMPS:
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RAMPS:
Equilibrant: a force which creates 'equilibrium' Fnet= 0N
Find the Fdown a 45o ramp on a 10 kg mass. Then find the mass's acceleration if the ramp is frictionless.
The Force of Tension in Suspended Objects
Force of Tension: a force pulling on ropes or cablesSuspended objects: the force of gravity is balanced by other forces
Static objects: these are objects at rest, all static objects have Fnet = 0 N
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Free Body Diagram: this is a diagram showing all forces on an object
After drawing a diagram,Draw a new diagram with The forces in TIP to TAIL Fashion.
Find the force of tension in each cable in the diagram below:
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