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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