Physics Test Chapter 3
a change in speed, direction, or both
A change in velocity includes?
Scalar
A physical quantity that has magnitude only.
displacement and average speed
A position-time graph allows the calculation of?
Vector
A quantity that has magnitude and direction
Origin
A reference point?
an ordered pair
An object's position at a given time can be represented by?
negative
Deacceleration would be?
d = average velocity x change in time
Displacement formula
it has a straight line and constant acceleration
Equations of motion can only be used when?
v2 = v1 + at
First equation of motion
replace all acceleration terms with gravity
How do you change the equations of motion when freefalling?
draw a tangent line (has to touch one point/cannot be on inside of curve)
If the slope of the position-time graph is not linear what do you do?
scaler
Is change in time a vector or scaler?
d= v1 x t + 1/2a (t)2
Second equation of motion
displacement of the moving object
The area underneath the curve of a velocity-time graph is the?
instantaneous speed
The speed of an object at any one moment (could get you a speeding ticket)
d= (v2)2 - (v1)2 / 2(a)
Third equation of motion
velocity change
Uniform acceleration motion involves a constant rate of?
bold
Vectors are represented in what?
Kinematics and Dynamics
What are the two branches of Mechanics?
Kinematics
What describes how objects move?
Dynamics
What describes why objects move?
Velocity
What includes speed and direction? (vector)
-9.81 m/s2
What is the gravity constant?
Displacement
What is the net change of position?
Mechanics
What is the study of motion/change in position?
Equations of motion
What is used to solve most problems involving straight line, constant acceleration motion? (sometimes there will be more than one possible method)
want to know the final velocity when you know the initial velocity and acceleration
When do you use the first equation of motion?
when freefalling
When would you change the equations of motion?
velocity-time graph
allows the calculation of acceleration
change in velocity/change in time
average acceleration formula
change in position/change in time
average speed formula
displacement/change in time
average velocity formula
Acceleration
change in velocity with respect to time (vector)
math and graph examples
look over math and graph examples
speed = distance/time
speed formula
they are stopped/not moving
what does a velocity of 0 mean?
Free fall
when an object falls under the influence of gravity alone with negligible air resistance