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33 Cards in this Set
- Front
- Back
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When is something in motion?
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When it is changing postition
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How do you calculate the SPEED of an object? ex:
she ran 200m in 60 seconds, how fast did she run? (average speed and instantaneous the same formula) |
s=d/t
3.33m/s |
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what is the speed of an object at one moment in time?
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instantaneous speed
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How is a distance time graph plotted?
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distance going LEFT
time on bottom |
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what is the velocity?
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speed of the object and its motion
ex: if a car is moving west at 50km the objects velocity is 50km W |
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measure of how quickly velocity changes -- includes direction
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Acceleration
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when is an object accelerating?
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speeds up. slows down. or turns
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how do you calculate acceleration?
ex: initial speed 6m/s final speed 12 m/s time: 3 s |
a= (Final speed-Initial speed) /
time PS when you slow down it is NEGATIVE speed, when you speed up it is positive! |
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What is Mass?
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amount of matter in an object,
the more matter, the harder to stop |
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tendency of an object to cahnge motion?
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inertia
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momentum - how do you calculate?
mass= 14 jk velocity= 2m/s north |
measure of how hard it is to stop an object:
m=mass * velocity 28 m/s north |
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what is the law of conservation of momentum?
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total momentum of a group of objects remains constant unless outside forces act on a group.
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force is
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a push or a pull
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Newtons first law
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states that the object in motion stays in motion and objects at rest stay at rest unless acted on by a nonzero force
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friction- what is it?
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force that brings nearly everything to as stop
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static friction is....
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type of friction that prevents an object from moving when a force is applied
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Sliding friction is....
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sliding friction slows down an object that slides, the bonds b/t the objects must be broken
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Rolling friction is ...
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occurs when an object rolls across a surface
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Newtons second law of motion
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object acted upon by a net force will accelerate in the direction of this force
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acceleration equation is :
net force= 4500N mass= 1500kg |
a= net force/mass
3.0 m/s2 |
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force of gravity b/t two objects depends on ____ and the ____ b/t thems.
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masses --- distence
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In ________ force pointing toward the center of the circle acts on the object
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circular motion
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newtons third law
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forces on two objects exert on each other are always qual but oposite directions
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___ and ____ forces dont cancel becausethey act on different objects
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Action and Reaction
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pressure equation is?
4N = force .003/2 = area |
P= F/A
1,333 pa |
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___ and ___ are gasses that flow
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Liquid and gasses
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bouyant force is...
it depends on ____ |
upward force exerted on all objects placed in the fluid
shape |
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archimedes principle =
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bouyant force on an object is = to the weight of fluid desplaced by the object
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and object floats when ____ on the fluid is equal to the objects weight
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Bouyant Force
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_____ states that the pressure applied at any point to a confined fluid is transmitted unchanged throughout the fluid.
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Pascals Principle
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___ sates that when the velocityof a fluid increases the pressure exerted by the fluid decreases
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Bernoulli's Principle
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a wing provides lift by...
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forcing an air downward
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density = ?
mass = 10g volume= 5cm2 |
mass/volume
2g/cm2 |
