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16 Cards in this Set
- Front
- Back
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Force
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Push or pull on an object
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Newton's First Law
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- "If at rest, stay at rest", "if moving, stay moving at constant velocity"
- Fnet = 0 = no acceleration - Things don't start moving randomly, a force is required |
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Inertia
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- An object's natural resistance to changes in motion
- Quantitatively measured by the object's mass |
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Newton's Second Law
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F = ma
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Newton (N) units
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kg*m/s²
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Newton's Third Law
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- Action-reaction pair = two different objects
- If object 1 acts on object 2 with a force, object 2 exerts a force on 1 equal but opposite in magnitude - Effects of these forces do NOT have to be the same |
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Weight
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w = mg
Changes with gravity Units: N |
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Mass
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Intrinsic property of an object that does not change
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Newton's Law of Gravitation
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F = G(Mm)/r²
Note: be careful about the distance (r). This can be an MCAT trap. |
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Friction
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Electrical interaction between an object's atoms upon contact and movement. Two types:
- Static - Kinetic |
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Normal Force
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Parallel to surface by definition (Fn)
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Coefficent of Friction
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Experimentally found, different for different surfaces
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Static Friction
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MAX Ff = us * Fn
Must overcome the force of static friction to get the object moving. Static friction is always greater than kinetic (takes more to get moving than to keep moving) |
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Kinetic Friction
(Equation) |
F = uk * Fn
Friction is always parallel to surface and opposite from the direction of velocity. |
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Inclined Plane
(Force due to Gravity) |
mgcosϴ
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Inclined Plane
(Force due to Friction) |
mgsinϴ
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