Chapter 2

Question 1

What is dynamics?

What is kinematics?

Answer 1

The study of motion and of physical concepts such as force and mass

Kinematics is the part of dynamics that describes motion without regard to its causes

Question 2

What is the difference between speed and velocity (average and instantaneous)

Answer 2

Speed- the path length over a given time
d/t
Average velocity- can be positive or negative (direction) and is change in X over change in time
Δx/Δt
Slope of the straight line connection two points on a position versus time graph
Page 35
Instantaneous velocity- limit if the average velocity as the time interval becomes infinitely small
The tangent line at a single point of a curve on a position versus time graph

Question 3

What is acceleration?

Answer 3

The change in velocity over time
When an objects velocity and acceleration are in the same direction, the speed of the object increases with time
When the objects velocity and acceleration are in opposite directions, the speed of the objects decreases with time

Question 4

Constant velocity means what for acceleration?

Answer 4

0 acceleration

Question 5

What are the 4 equations we can use with constant acceleration?

Answer 5

V=Vo +at
Δx=1/2(Vo+V)t
Δx= Vot + 1/2at^2
V^2=Vo^2+2aΔx

Question 6

What is the area under the graph of a velocity vs time graph?

Answer 6

It is the displacement of the object

Question 7

Do acceleration examples on pages 44-47

Do free fall examples on pages 50-54

Answer 7

Okay

Question 8

What is always the acceleration of a free falling object?

Answer 8

a=-g=-9.80m/s^2

WHEN AIR RESISTANCE IS NEGLIGIBLE