Ch 4 Linear Motion

Question 1

How can you tell if an object is moving?

Answer 1

An object is moving if its position relative to a fixed point is changing

Question 2

Definition of speed?

Answer 2

How fast an object is moving

Question 3

How can you calculate speed?

Answer 3

Speed= distance➗time

Question 4

The speed at any instant is called the _______________

Answer 4

Instantaneous speed

Question 5

Formula for average speed?

Answer 5

Average speed= total distance➗time interval

Question 6

How to find total distance traveled?

Answer 6

Total distance= average speed ✖️ travel time

Question 7

What is velocity?

Answer 7

Speed in given direction

Question 8

How is velocity different from speed?

Answer 8

Speed- description of how fast an object moves

Velocity- how fast and in what directions it moves

Question 9

Acceleration is?

Answer 9

Rate at which velocity is changing

Question 10

How to calculate acceleration?

Answer 10

Acceleration= change of velocity➗time interval

Question 11

Definition of a free fall?

Answer 11

An object moving under the influence of the gravitational force only

Question 12

What is the elapsed time?

Answer 12

Time that has passed since beginning of any motion

Question 13

Acceleration of a free fall?

Answer 13

During each second of fall the instantaneous speed of the object increases by an additional 10 m/s

Question 14

How to find instantaneous speed?

Answer 14

Instantaneous speed=acceleration✖️elapsed time

V=gt

Question 15

Explain an objects instantaneous speed when it is thrown straight up in the air

Answer 15

Starts @ certain speed and declines by 10 m/s until it reaches its highest point (0 m/s). Then it regains speed 10 m/s at a time until it lands

Question 16

For a falling object how does the distance per second change?

Answer 16

For each second of freefall an object falls a greater distance than it did in the previous second

Question 17

Describe Speed (vertical axis) vs. time (horizontal axis) graph

Answer 17

The line is straight (linearity). For every increase of one second there’s the same 10 m/s increase in speed. Time and speed are direct proportions (double t, double v). It represents acceleration.

Question 18

Describe distance (vertical axis) vs. time (horizontal axis)

Answer 18

Result is curved line. Relationship between distance and time is nonlinear. It is quadratic and the curve is parabolic. Double t, quadruple d. Distance depends on time squared. Speed increases as time passes.

Question 19

How does air resistance affect falling objects

Answer 19

Air resistance noticeably slows the motion of things with large surface areas like falling feathers or pieces of paper. But air resistance less noticeably affects the motion of more compact objects like stones and baseballs

Question 20

What is the relationship between the velocity and Acceleration

Answer 20

Acceleration is the rate at which velocity itself changes

Question 21

When you describe the motion of one object with respect to another, we say that the object is moving _____ to the other object

Answer 21

Relative