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26 Cards in this Set
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 Back
Calculate speed

s=d/t
usually expressed as meters per second (m/s) 

Distancetime graphs

be able to understand & create a graph like on page 253 81


what is the slope equal to in a distancetime 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 