1.3Position, Time and displacement

Question 1

Negative numbers are not to be avoided as they simply:

Answer 1

Locate an event in space or time relative to an origin.

Question 2

Position vector with sled question *compare with coordinate system (2) with ex

Answer 2

an arrow from the origin to the point representing the sled.

Does not tell u anything different than the coordinates (x,y). It simply provides the info in an alternate form

• ex: (21m,45 degrees)

Question 3

Coordinates

Answer 3

(x3,y3)

Question 4

Scalar (2)

Answer 4

A single number that describes a physical quantity

Can be positive, negative or zero

Question 5

Vector (2)

Answer 5

A quantity that has both a size (how much/how fast) and a direction (which way).

Has a directional aspect and cannot be described by a single number

Question 6

Displacement

Answer 6

change in an object’s position

Question 7

Vector equation for sled finding r4 vector:

Answer 7

r4=r3+(Change in) “r”

r4 is the vector sum of the vectors r3 and (change in )”r”.

Question 8

Adding vectors (add B to A)

Answer 8

1. draw A
2. Place the tail of B at the tip of A
3. Draw an arrow from the tail of A to the tip of B.

Question 9

The displacement of (CIR)R of an object as it moves from one position ra to a different position rb is:

Answer 9

(CIR)r=rb-ra

Question 10

As time proceeds, an object is speeding up if the displacement vectors

Answer 10

are increasing I length

Question 11

As time proceeds, an object is slowing down if its displacement vectors are

Answer 11

decreasing in length