Dynamics-Vectors And Scalars

Question 1

Vector quantity

Answer 1

A quantity with magnitude and direction

Question 2

Scalar quantity

Answer 2

A quantity with magnitude only

Question 3

Examples of vector quantities

Answer 3

Displacement, velocity, acceleration, force and weight

Question 4

Examples of scalar quantities

Answer 4

Distance, speed, time, mass and energy

Question 5

Difference between a vector and a scalar

Answer 5

Vectors have magnitude and direction; scalars have magnitude only

Question 6

Speed

Answer 6

Distance travelled per second

Question 7

Velocity

Answer 7

Displacement travelled per second

Question 8

Distance

Answer 8

Total path length travelled by an object

Question 9

Displacement

Answer 9

The straight-line distance and direction from where you started to where you finished.

Question 10

How to find resultant of two vectors in one dimension.

Answer 10

Add if in same direction; subtract if in opposite directions.

Question 11

How to find resultant of two vectors at right angles

Answer 11

Use Pythagoras: resultant = √a²b²

Question 12

Relationship between speed, distance and time

Answer 12

distance = speed x time
d = vt

Question 13

Relationship between velocity, displacement and time

Answer 13

displacement = velocity x time
s = vt

Question 14

How is average speed or velocity shown in a relationship?

Answer 14

v̄

Question 15

Calculating average speed

Answer 15

average speed = distance/time
v̄ = d/t

Question 16

Measuring average speed

Answer 16

Measure total distance travelled and total time taken.

Question 17

Calculating average velocity

Answer 17

average velocity = displacement/time
v̄ = s/t

Question 18

Measuring instantaneous speed with a light gate

Answer 18

Instantaneous speed = length of card ÷ time through light gate