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26 Cards in this Set

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Calculate speed
s=d/t
usually expressed as meters per second (m/s)
Distance-time graphs
be able to understand & create a graph like on page 253 8-1
what is the slope equal to in a distance-time graph?
the speed fo the object
Momentum (know how to calculate momentum, mass & velocity)
momentum = mass*velocity
p=mv
Acceleration (know how to calculate an object's accceleration)
a=(VfVi)/t
a = acceleration
Vf = final velocity
Vi = initial velocity
t = time
Negative Acceleration
Deceleration
Velocity vs. Time Graphs
Be able to analyze & answer questions
Force
the NET force determines if the velocity of the object will change
F=m*a
F=force
m=mass
a=acceleration
Balance
Balance forces do not change motion because each motion cancels the other motion
Unbalanced Forces
Unbalanced forces do not cancel completely
Friction
Know example & relative strength of:
Sliding
Rolling
Fluid/Air Resistance
Gravity - what two factors determine the amount of gravitational attraction two objects have for one another?
the masses of the objects and their distance apart from one another
Newton's 1st Law of Motion (law of inertia)
An object at rest remains at rest and an object in motion maintains its velocity unless it experiences an unbalanced force
Newton's 1st Law - know examples
a) ride in a car, it stops but you feel like your body is still moving forward
b) slide a book across a rough surface and it comes to rest
c) slide something across a smooth surface like ice and it slides much further before it stops
Inertia
inertia is the tendencey of an object at rest to remain at rest or, if moving, to continue moving with a constant velocity
Newton's 2nd Law of Motion
the unbalanced force acting on an object equals the object's mass times its acceleration
Know examples
a) pushing an empty shopping cart vs. pushing a full shopping cart (empty has greater acceleration)
b) throwing a shot put vs. throwing a baseball
Mass
mass is a measure of the amount of matter in an object
Weight
weight is the gravitational force an object experiences due to gravity
Which would change & which would remain the same on moon?
a)the mass would stay the same because there is the same amount of matter in the object
b) the weight would change because the gravity would be different
how do you calculate mass?
measure on scale
how do you calculate weight?
object's mass * force of gravity on earth (9.8m/sec2)
Free fall
when the force of gravity is the only force acting on an object, the object is said to be in free fall
Terminal Velocity
when the force of air resistance becomes equal to the gravitational force on an object it stops accelerating and reaches its maximum velocity - the terminal velocity
Newton's 3rd Law of Motion
For every action force, there is an equal and opposite reaction force
know examples
a) soccer ball & foot hitting the ball exert equal force
b) hot gas push rockets forward and the rocket pushes gases backward which makes the rocket move forward