Chapter 5 Newton’s Second Law of Motion – Force and Acceleration
Acceleration = Change in __________ / Change in __________
______________ Causes Acceleration
Newton’s ______________ law States The acceleration produced by
a net _____________ on an object is directly proportional to the
magnitude of the net force, is in the ___________ direction as the net
force, and is inversely proportional to the ____________ of the
object.
Force = mass x acceleration
The acceleration produced depends on the __________ of the object
that the force is applied.
Acceleration = ________________ / mass
Friction acts on materials that are in ____________ with each other,
and it always acts in a direction that ______________ motion.
Friction
Push
A diagram showing all the forces acting on an object is called a
______________________________________.
_____________________________ is the friction acting on
something moving through the air, it is a very common form of “fluid”
friction.
Air Resistance
Weight
___________________ The amount of force per unit area.
Weight
The pressure that the above block exerts on the table can be
calculated using the following equation:
Pressure = Blocks Weight (N) / Contact area (L x W)
________________ is the unit for pressure and it is measured in
newtons per square meter.
Galileo showed that falling objects accelerate __________________,
regardless of their masses.
F
m
F
m
W = 98 N
W = 9.8 N
F weight 9.8N 9.8kg  m / s 2
Smaller: a  


 9.8m / s 2  g
m
m
1kg
1kg
F weight 98 N 98kg  m / s 2
Larger: a  


 9.8m / s 2  g
m
m
10kg
10kg
Notice both blocks accelerate at g. Therefore they would both hit the
ground _________________ if they were dropped from a tall building.
Terminal _____________________ is reached when air resistance
equals weight.