Module 2: Linear Motion

Question 1

Initial Position Variable

Answer 1

x1, x0, xi

Question 2

Final Position Variable

Answer 2

x2, xf, x without subscript

Question 3

Displacement Equation

Answer 3

△x = x2 - x1

change in x = final - initial

Question 4

Distance vs. Discplacement

Answer 4

Distance: physically how far you traveled. Always positive. Scalar quantity.

Displacement: care about direction traveled. Vector quantity.

Question 5

Scalar Quantity

Answer 5

Physical quantity this is completely described by its magnitude.

Question 6

Examples of scalar quantities

Answer 6

Volume, density, speed, energy, mass, and time.

Temperature

Question 7

Vector Quantity

Answer 7

Quantity that has both magnitude and direction.

Question 8

Examples of vector quantities

Answer 8

Displacement, velocity, and acceleration.

Question 9

Average/Constant Velocity

Answer 9

Moving at the same speed in the same direction.

V(average), x = (x2 - x1) / (t2 - t1) = △x/△t

Question 10

Speed vs Velocity

Answer 10

Speed: is the time rate at which an object is moving. Scalar; always positive.

Velocity: rate and direction of an object’s movement.

Question 11

Average Velocity (Graphical Analysis)

Answer 11

rise over run

Question 12

Instantaneous Velocity

Answer 12

How fast an object is moving at a specific time.

Question 13

Acceleration

Answer 13

Rate of change of velocity.
Will almost always be constant.
No deceleration, only neg and pos acceleration.
a = △v/△t

Question 14

Relationship of Velocity and Acceleration

Answer 14

If they are in the same direction, the object is speeding up.
If they are in different directions, the object is slowing down.
If instantaneous velocity is 0, there can still be an acceleration, the object is changing directions.

Question 15

Kinematic Equation: Velocity as a function of time

Answer 15

Vfx = Vix + (ax)t

Question 16

Kinematic Equation: Position as a function of time

Answer 16

xf = xi + Vix(t) + 1/2(ax)t^2

Question 17

Kinematic Equation: Velocity as a function of position

Answer 17

Vfx^2 = Vix^2 + 2(ax)(xf - xi)

Question 18

Free Fall Kinematic Equation: Velocity as a function of time

Answer 18

Vfy = Viy - gt

Question 19

Free Fall Kinematic Equation: Position as a function of time

Answer 19

yf = yi + Viy(t) - 1/2g(t^2)

Question 20

Free Fall Kinematic Equation: Velocity as a function of position

Answer 20

Vfy^2 = Viy^2 - 2g(yf - yi)

Question 21

Examples of motion in one dimension (linear motion)

Answer 21

An airliner accelerating down the runway before taking off.
A blood cell moving along a capillary.
A rocket climbing upward from the launch pad.
A car moving on a straight road.
Dropping a pencil.
Throwing a ball straight up.