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# 1st midquarter test

### Physics

QuestionAnswer
units used for force Newtons [n]
units used for pressure newtons/centimeters2 [n/cm2]
units used for area centimeters2 [cm2]
units used for distance meters [m]
units used for speed meters/second [m/s]
units used for reaction time seconds [s]
units used for velocity meters/second [m/s]
units used for length meters [m]
units used for width meters [m]
how are mass and weight different mass is a measurement of matter and weight is a measurement of how gravity affects mass
define force a push or a pull
whats the formula for pressure p=f/a
as a mass increases an objects inertia ... increases
define inertia an objects resistance to a change in state of motion
why is newtons first law also called "the law of inertia" because newtons first law is based on the property of inertia
what is newtons 1st law an object in motion stays in motion, an object at rest stays at rest unless acted on by an outside force
define constant speed a speed that doesnt change
define instantaneous speed a speed at a particular instant in time
define average speed total distance divided by total time
can average speed and instantaneous speed be the same? when? yes when traveling at a constant speed
what is the distance between speed and velocity velocity includes direction and speed does not
-whats the speed formula -re-write it, solved for time - re-write it, solved for distance -s=d/t -t=d/s -d=t*s
as a driver increases his/her speed the minimum safe following distance ... ( increases or decreases) increases
how does talking on a cell phone affect a drivers reaction time (increases it or decreases it) increases it
what is the minimum safe following distance measuring the distance traveled before a person reacts
when measuring a reaction time, what two events are we measuring the time between when an event occurs and when a person reacts
Created by: rachel111

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