PHY 101: Chapter 2
19 Cards in this Set
| Front | Back |
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mechanics
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-branch of physics
- study of motion
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kinematics
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-description of motion without its cause
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dynamics
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study of cause of motion and the effects it has
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three concepts of motion
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1. displacement: x
2. velocity: v
3. acceleration: a
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distance
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(+) right direction, (-) left direction
-scalor - no vector needed on top
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speed
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- distance per time
-speed has no direction or unit associated with it
-SCALOR quanity
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Vectors
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-magnitude and direction
- shown by arrow on top
-ex: velocity, acceleration, displacement
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scalor
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magnitude without units
ex: speed, distance
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average velocity
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the rate at which displacement occurs
v= delta x = Xi - Xf
delta t ti- tf
-units: m/s
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average speed
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total distance traveled divided by the total time elapsed
-scalor unit
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instantaneous velocity
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- velocity at a given point in time
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constant velocity graph
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an object moving will have graph with a straight line
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When is the acceleration of a moving object zero?
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- when the object is cruising
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When is the velocity of an object zero?
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- in the instant the object starts to move
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What does it mean when v and a signs are the same?
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the speed is increasing
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what does it mean when v and a signs are different?
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the object is slowing down, speed is decreasing
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average acceleration graph
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the slope of the line connecting the initial and the final velocities on a velocity- time graph
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instantaneous acceleration graph
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-the slope of the tangent to the curve of the velocity- time graph
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When will velocity change uniformly with time?
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when the acceleration is constant
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PHY 101: Chapter 1