Physics: Displacement & Distance AND Velocity & Speed Quiz #2

Scalar

A measured quantity that has NO direction

Vector

A measured quantity that INCLUDES direction

Scalar example

Distance, time, mass, volume speed

Vector example

Displacement, velocity

Distance

The complete length of a path traveled by a moving object

True or false: Distance is a vector.

FALSE!! It’s a scalar

Distance = “_____ covered”

ground

Displacement

The length of the straight-line path of a moving object from its origin to its final position

True or false: Displacement is a vector.

True

Positive sign conventions

• Up 

• North

• East

• Right

Negative sign conventions

• Down

• South

• West

• Left

Disp. of a bird flies 5m north, then 7m south

-2m

4² + 3² = what?

5² (it’s just a rule)

If an object is to the left of the origin, that means the disp. is _____.

negative

Velocity

Change is disp. occurring over time

Velocity includes ____ ______ = it’s a ______.

magnitude, direction, vector

Speed

Change in distance occurring over time

Speed includes ______ only, so is a _______.

magnitude, scalar

Speed equation

V = d/t

Avg. speed equation

Vavg = d-total/t-total

What does the first graph show?

• Constant zero slope

• Motionless object

What does the second graph show?

• Constant positive slope

• Moving with constant positive velocity

What does the third graph show?

• Increasing slope

• Moving with increasing velocity

Time formula

t = d/v

Distance formula

d = v(t)

Velocity graphs = finding the ______.

displcement

Finding distance on a graph is calculating the _____ of the graph line and subtracting the ______ minus ______ space.

space, positive, negative

Velocity/speed sometimes needs to ______ tag on the end of it.

direction (ex. 10 m/s northeast)

Use the _____ ______ to find distance sometimes.

pyth. theorem

A ball sits 3 m. motionless to the right of the origin. What does the distance graph look like?

A horizontal line at 3 m. (distance on y slope)

A ball sits 3 m. motionless to the right of the origin. What does the velocity graph look like?

A vertical line at 0 secs.

Average velocity

V = total disp./total time

Average speed

V = total dist./total time

If an object sits motionless, its velocity is automatically

0 m/s

Move _____ to the right or left if it makes sense.

decimal