Term
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Definition
| -how closely the measurement agrees with the accepted value |
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Term
| -Which digits are significant? |
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Definition
-any nonzero digits in a number
-any zeros between non-zero digits
-zeros appearing at the end of a number and to the right of the decimal point |
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Term
| -Adding or subtracting with significant digits |
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Definition
| -the result cannot be more precise than the least precise number being added or subtracted |
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Term
| -Multiplying or dividing with significant digits |
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Definition
| -the result should have the same number of significant digits as the “input” number with the fewest |
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Term
| The Difference between speed and velocity |
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Definition
-Velocity is a vector- it has magnitude and direction
-Speed is a scaler- it has magnitude but no direction |
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Term
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Definition
-Acceleration = change in velocity (Δv) / change in time (Δt)
-Can be a change in speed or direction or both
-Acceleration = slope of a velocity time graph |
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Term
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Definition
-Has magnitude and direction (vector)
-Use arrows to represent velocity (-------)
-Velocity = change in displacement (Δd) / change in time (Δt)
-Velocity = Slope of a displacement-time graph
-Instantaneous velocity: average velocity over an infinitesimally small period of time
-Unit: meters per second (m/s) |
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Term
| How do you find displacement from a velocity/time graph? |
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Definition
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Term
| How do you find the velocity on a displacement/time graph? |
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Definition
| Find the slope (slope=velocity) |
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Term
| How do you find the acceleration on a velocity/time graph? |
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Definition
| Find the slope (change in velocity/change in time) |
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Term
| Steps to solving a projectile motion problem |
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Definition
-Draw a picture
-Split into x and y components
-Find time to max height (v = at+v0)
-Find max height (d = ½ at2 + v0t + d0)
-Find time from max height to ground (Δd = ½ at2 + v0t)
-Find total time (total time = time to max height + time to ground)
-Find range (Δd = v0t – the ½ at2 cancels out) |
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Term
| What angle gets you maximum projectile rang |
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Definition
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Term
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Definition
-A push or a pull
-Has a direction |
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Term
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Definition
| -The sum of all individual forces acting on an object |
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Term
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Definition
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Term
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Definition
-1. “Law of Inertia”
-An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by a nonzero outside force |
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Term
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Definition
-“Fnet = ma”
-The net force acting on an object is equal to the object’s mass times it’s acceleration |
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Term
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Definition
-“action-reaction”
-For every force that one object exerts on another, the second object exerts a force back on the first that is equal in magnitude but opposite in direction |
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Term
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Definition
Weight
-Is a force
-unit: Newtons
-force of gravity on an object
-has direction
-w = mg
Mass
-not a force
-unit: kg
-how hard it is to change an object’s motion
-no direction
-constant |
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Term
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Definition
| How closely the measurement agrees with the accepted value. |
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Term
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Definition
The opposing force air has on a moving object.
When it’s equal to gravity, you have equilibrium. |
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Term
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Definition
| Standard ways of measuring. |
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Term
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Definition
| Tells you where the zero point of the variable you are studying is located. |
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Term
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Definition
| Location. Defines the distance and direction between two points. |
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Term
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Definition
| An object is in equilibrium when all the forces acting on it cancel out and the net force is zero. |
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Term
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Definition
| When something is subject only to the force of gravity and nothing else. |
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Term
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Definition
| The average velocity over an infinitesimally small period of time. |
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Term
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Definition
| When objects exert forces on each other. |
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Term
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Definition
Something’s size;
-the amount of space it takes up
-not a force
-unit: kilograms
-how hard it is to change an object’s motion
-no direction
-constant |
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Term
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Definition
-The highest point an object reaches
-At the max height velocity = 0 |
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Term
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Definition
| The point at which the variables have the value of zero. |
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Term
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Definition
-The exactness of a measurement
-For a measuring device, precision is equal to ½ the smallest division. |
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Term
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Definition
-The distance something travels horizontally
-Range = v2sin(2θ)/g (**when launched and lands at same height) |
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Term
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Definition
| -The “valid” digits in a measurement. |
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