Chapter 4: Vectors and Kinematics

Question 1

Distinguish between vector and scalar quantities

Answer 1

Vector:
- magnitude
- units
- DIRECTION

Scalar:
- magnitude
- units

Question 2

List some scalar quantities

Answer 2

Time / s
Distance / m
Speed / m s-1
mass / kg
temp / K
pressure / Pa
energy /J
work done/J

Question 3

List some vector quantities

Answer 3

Displ. / m
velocity / m s-1
accel / m s-2
force / N

Question 4

Addition of vectors

Answer 4

arrow pointing right (–>) = positive

arrow pointing left (<–) = negative

Simple addition/ subtraction but the direction must be taken into account for resultant force (direction must be stated)

Question 5

Grad and area of graphs give?

Answer 5

grad. area
s-t velocity. ///////

v-t accel. ∆displ.

a-t ////////. ∆Vel

Question 6

what does the + or - sign represent for vectors?

Answer 6

Direction

Question 7

Describe free fall

Answer 7

Falling under the influence of gravity in the absence of any resistive forces

Question 8

State magnitude and direction of acceleration due to gravity

Answer 8

g = 9.81 m s-2 downwards

or in mcq:

g = 10 m s -2 downwards

Question 9

State the force that prevents free fall from occurring over long periods of time

Answer 9

Air resistancr

Question 10

State the quantity with which air resistance increases with

Answer 10

speed or surface area

Question 11

Explain what is mean by terminal velocity

Answer 11

The constant speed at which an object falls. This occurs when air resistant equals the weight of the falling object.