Basic Physics (Unit 1)

Question 1

What are the 6 SI base units?

Answer 1

• m
• kg
• s
• A
• K
• mol

Question 2

What is the SI base unit for length?

Answer 2

• metre (M)

Question 3

What is the SI base unit for mass?

Answer 3

kg

Question 4

What is the SI base unit for time?

Answer 4

seconds (s)

Question 5

What is the SI base unit for electrical current?

Answer 5

Ampere (A)

Question 6

What is the SI base unit for thermodynamic temperature?

Answer 6

degree Kelvin (K)

Question 7

What is the SI base unit for amount of substance?

Answer 7

mole (mol)

Question 8

What is a Scalar?

Answer 8

a quantity that has magnitude only.

Question 9

What is a Vector?

Answer 9

a quantity which has both magnitude and direction

Question 10

Examples of Scalar?

Answer 10

-distance
-speed
-density
-pressure
-time

Question 11

Examples of Vectors?

Answer 11

-displacement
-velocity
-acceleration
-force

Question 12

What is density?

Answer 12

a substances mass per unit volume

Question 13

What is the conversion for 1 g/cm^3 into kg/m^3

Answer 13

1g/cm^3 = 1000 kg/m^3

Question 14

What is meant by the turning effect of a force

Answer 14

A moment

Question 15

Principle of moments?

Answer 15

For a system to be in equilibrium (1)
Sum of anticlockwise moments [about a point] = Sum of clockwise moments
[about the same point]

Question 16

How do you work out density?

Answer 16

P = M/V

Question 17

What is Density?

Answer 17

mass per unit volume

Question 18

What is centre of gravity?

Answer 18

-single point within a body at which the entire weight of the body may be considered to act

Question 19

How to work out moment?

Answer 19

Force (N) x perpendicular distance from pivot (m)

Question 20

Why is the velocity constant horizontally and changing vertically in projectiles?

Answer 20

• no forces horizontally
  -gravity acts vertically

Question 21

Experiment to measure the density of solids? equipment list?

Answer 21

• weighing scale
• 30 cm ruler
• vernier callipers
  -various regularly shaped solids both rectangular and circular

Question 22

Experiment to measure the density of solids? Cube or cuboid

Answer 22

-For rectangular objects create table with mass , width, length , height calculated volume and density stating their units
- Measure the mass using the weighing scale
-measure the length height and width using the ruler and calculate volume
- use the equation density = mass/volume

Question 23

Experiment to measure the density of solids? sphere

Answer 23

-measure diameter using vernier callipers and half for radius
- on table keep measurements on left stating the appropriate units and calculate density to an appropriate amount of significant figures
- use equation 4/3 pi r^3 to calculate density of the sphere