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30 Cards in this Set
- Front
- Back
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The modern study of motion...
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mechanics 13A
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What is the proper way to begin the study of motion?
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by describing motion 13A
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The two parts of motion...
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kinematics (the description of how things move) dynamics (why things move) 13A
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A group of landmarks used to study motion.
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frame of reference
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Change in position of an object...
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displacement 13A
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Displacement over time...
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speed 13A
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Formula for velocity (or speed in a certain direction)
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v=d/t 13A
d=distance t=time units will be in m/s or km/hr |
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Formula for acceleration...
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a=vf-vi
_____ t vf=final velocity 13A vi=initial velocity |
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Newton's first law of motion...
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an object in motion will stay in motion and an object at rest will stay at rest unless it is acted on by a force 13B
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The resistance to change in motion...
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inertia 13B
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Newton's second law of motion...
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The value of an unbalanced force is equal to its mass times its acceleration
F=ma 13B |
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Unit of force...
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newton (N)
which are kg m/s2 13B |
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Newton's third law of motion...
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For every action, there is an opposite and equal reaction 13B
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Rockets take off by...
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action-reaction forces
(third law) |
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What motion law are these:
When you car stops, you are thrown forward and a rocket in space doesn't have to burn feul to keep going straight? |
First law
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What motion law are these: when air resistance balances gravity, raindrops stop accelerating and a light bike can accelerate faster?
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Second law
13B |
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What law are these: When you lean against a wall, it supports you and when you dive from a boat, it moves backward.
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third law
13B |
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Quantities that give only magnitude such as speed, distance, or force are...
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scalar 13A
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Quantities that give magnitude and direction such as velocity are...
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vectors 13A
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A triangle symbol means...
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change in 13A
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Forces (such as gravity) that act on objects without touching them...
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action-at-a-distance forces 13C
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Who was the scientist that first experimented with gravitational attraction...
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Galileo 13C
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If a book and a bowling ball are dropped out of a plane which would hit first?
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Both would hit at same time. 13C
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If you drop a book and a feather on Earth and on the Moon, what would be different?
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The book would hit first on Earth because the feather would have air resistance, but on the moon, they would hit together. 13C
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On Earth, the acceleration due to gravity is..
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9.8 m/s2
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The distance that an accelerating object travels...
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d=1/2 a t2
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The highest velocity at which an object can fall...
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its terminal velocity (when gravity is exactly balanced by resistance of the fluid its falling in)
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Universal law of gravitation...
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m1 time m2
F=G x __________ d squared |
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G in the universal gravitation formula is a fundamental...
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physical constant
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Satellites are...
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celestial bodies in orbit around another celestial body
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