Physics Test Chapter 3

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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


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