1 — vectors and scalars

Question 1

Physical quantity

Answer 1

Is a quantity that can be measured. It consists of a numerical magnitude and a unit.

Question 2

Base quantities

Answer 2

Length, mass, time, electric current, luminous intensity, amount of substance, thermodynamic tempt

Question 3

Derived quantities

Answer 3

Speed, area, volume, density

Question 4

1 oscillation

Answer 4

1 oscillation is one complete to-and-fro movement of the pendulum

Question 5

Period

Answer 5

Time taken for 1 complete oscillation

• affected by
  1. Length of pendulum
  2. Acceleration due to gravity
• independent of mass or size of bob

Question 6

Scalar

Answer 6

physical quantities that have only magnitude

Question 7

Vector

Answer 7

physical quantities that possess both magnitude and direction

Question 8

Speed

Answer 8

Distance moved per unit time

Question 9

Velocity

Answer 9

Rate of change of displacement

Question 10

Why the angle of displacement needs to be small for pendulum

Answer 10

Oscillation occurs in a single plane

Question 11

Diameter of atom

Answer 11

10^-10m
0.1 nm

Question 12

Radius of earth

Answer 12

10^7m
10 Mm

Question 13

Displacement

Answer 13

Distance travelled in a specified direction

Question 14

average speed

Answer 14

Total distance travelled over total time

Question 15

Vector quantities

Answer 15

Displacement, velocity, acceleration, force, weight

Question 16

scalar quantities

Answer 16

Distance, mass, volume, time, speed, charge

Question 17

Diameter of human hair

Answer 17

10^-4 m