Newton's First and Second Laws
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inertia
tendency of object to resist change in motion more mass means more inertia
Newton’s First Law
An object at rest will remain at rest; and object in motion will continue to move in a straight line path with constant velocity as long as no forces act on object
contact forces
push or pull (touches object)
friction
opposes sliding motion
normal
surface on object
tension
pull of a rope or a cable
weight
force due to gravity
formula for weight
weight=mass x acceleration
Net Force
the total amount of force on an object
What unit must mass be in when calculating the net force?
kg
What unit must acceleration be in when calculating the net force?
m/s^2
Newton’s Second Law
The acceleration of an object is directly proportional to the net force and inversely proportional to the mass.
What is the formula to find acceleration?
a=Fnet/m
What is the formula to find the net force?
Fnet=mass x acceleration
What is the formula to find the force of gravity?
Fg=mass x 9.8
Steps for solving force problems
Draw free-body diagrams with forces Determine Fnet use Newton’s second law to solve for the variable you want use equations from unit 2
When Fnet=0 what does a=?
0 m/s^2