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26 Cards in this Set
- Front
- Back
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Calculate speed
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s=d/t
usually expressed as meters per second (m/s) |
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Distance-time graphs
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be able to understand & create a graph like on page 253 8-1
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what is the slope equal to in a distance-time graph?
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the speed fo the object
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Momentum (know how to calculate momentum, mass & velocity)
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momentum = mass*velocity
p=mv |
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Acceleration (know how to calculate an object's accceleration)
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a=(VfVi)/t
a = acceleration Vf = final velocity Vi = initial velocity t = time |
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Negative Acceleration
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Deceleration
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Velocity vs. Time Graphs
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Be able to analyze & answer questions
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Force
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the NET force determines if the velocity of the object will change
F=m*a F=force m=mass a=acceleration |
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Balance
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Balance forces do not change motion because each motion cancels the other motion
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Unbalanced Forces
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Unbalanced forces do not cancel completely
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Friction
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Know example & relative strength of:
Sliding Rolling Fluid/Air Resistance |
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Gravity - what two factors determine the amount of gravitational attraction two objects have for one another?
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the masses of the objects and their distance apart from one another
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Newton's 1st Law of Motion (law of inertia)
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An object at rest remains at rest and an object in motion maintains its velocity unless it experiences an unbalanced force
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Newton's 1st Law - know examples
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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 |
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Inertia
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inertia is the tendencey of an object at rest to remain at rest or, if moving, to continue moving with a constant velocity
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Newton's 2nd Law of Motion
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the unbalanced force acting on an object equals the object's mass times its acceleration
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Know examples
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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 |
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Mass
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mass is a measure of the amount of matter in an object
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Weight
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weight is the gravitational force an object experiences due to gravity
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Which would change & which would remain the same on moon?
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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 |
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how do you calculate mass?
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measure on scale
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how do you calculate weight?
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object's mass * force of gravity on earth (9.8m/sec2)
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Free fall
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when the force of gravity is the only force acting on an object, the object is said to be in free fall
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Terminal Velocity
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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
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Newton's 3rd Law of Motion
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For every action force, there is an equal and opposite reaction force
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know examples
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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 |
