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# Physics test 1

### Test Date: 9/29/2015

TermDefinition
Gravity The force that attracts one object towards the center of the earth, or any other object of mass
Acceleration Acceleration is the rate at which velocity is changing with respect to time
Acceleration FORMULA speed/time or distance/time/time or ΔV/time
Velocity Velocity is speed together with time Velocity is only constant when speed and direction are BOTH constant
Velocity FORMULA Distance/time in a direction
Speed Speed is a measure of how fast something is moving.
Speed FORMULA Distance/time
What did we learn from the 1st car ramp experiment? The steeper the angle of the car's ramp, the faster the car travels because gravity is helping more as the ramp gets steeper
What did we learn from the 1st marble drop experiment? As the measured distance of the fall increases, the speed at PB increases, showing proof of acceleration
What did we learn from the 2nd marble drop experiment? TBD
What did we do in the 1st car ramp experiment? Each group was assigned a height to place one end of the ramp at, and then we found the average speed at each height, and then shared with the class
What did we do in the 1st marble drop experiment? We found the times from PA to PB, at PA and at PB as well as the speed at PA and PB with a measured fall distance of 5-75 cm in 5 cm increments. We then graphed and analyzed the data. Also, we learned how to predict speed based on time
What did we do in the 2nd marble drop experiment? TBD
Displacement Displacement is how much an object has moved from its original position "How far out of place an object is"
Distance Distance is how much ground an object has covered, or how far it moved (mm, cm, m, km) (in, ft, yrd, mi)
Time How long something took to happen. (multiples/divisions of sec, minute, hour)
Variables A variable is any trait, factor, or condition that can exist in differing amounts or types
Define: - Mean - Median - Mode - Range - Add up all numbers, and divide by the number of numbers - The number in the middle of the organized list lowest to highest - The number that appears most often - The smallest value subtracted by the largest value
Hypothesis A supposed explanation or answer to a question that prompts further investigation or experimentation, and is the start of a lab
The two types of graphs; name SPEED VS TIME DISTANCE VS TIME
Percent difference/ percent change Percent increase and percent decrease are measures of percent change, which is the extent to which a variable gains or loses intensity, magnitude, extent, or value.
How to find percent difference % = (difference of the values) / (average of the values) x 100
Instantaneous speed Instantaneous speed is the speed of an object at any instant
Average speed Average speed is the total distance covered, divided by the time interval
Independent Variable The variable that changes or is changed in the experiment There can only be one per experiment
Dependent Variable The variable that is affected by the independent variable Your data
Constant Variable The variable(s) that stays the same throughout the experiment
what did we learn in the 2nd car ramp experiment? The more weights put on the car, the faster the car's time from PA to PB
what did we do in the 2nd car ramp experiment? Our group tested the car's travel time from PA to PB with 0, 1, 2, or 3 200g weights on the car
Created by: egbednar