Science concepts

Question 1

Mass (kg) x Acceleration = ???

Answer 1

Force (newton)

Question 2

Mass (kg) x Gravitational Field Strength (N/kg) = ???

Answer 2

Weight (newton)

Question 3

FD = M means?

Answer 3

Force (N) x perpendicular distance from pivot (m) = Moment of force

Question 4

How is mass measured?

Answer 4

Using a beam balance of electronic balance

Question 5

How is weight measured?

Answer 5

Using a spring balance

Question 6

In order for work to be done, what are the conditions?

Answer 6

When a force acts on an object, the object must move in the same direction as the force.

Question 7

W = F x D ?

Answer 7

Work done = Force x Distance moved in the direction of the force

Question 8

Force (N) x Distance moved in the direction of the applied force = ?

Answer 8

Work done

Question 9

Force SI unit:

Answer 9

Newton (N)

Question 10

Mass SI unit

Answer 10

kilogram (kg)

Question 11

Weight SI unit

Answer 11

Newton (N)

Question 12

Distance SI unit

Answer 12

metre (m)

Question 13

Pressure SI unit

Answer 13

Pascal (Pa)

Question 14

Define pressure:

Answer 14

It is the amount of force acting perpendicularly on a unit area

Question 15

Force/Area = ??

Answer 15

Pressure

Question 16

What is the pressure exerted by the air in the earth’s atmosphere called?

Answer 16

Atmospheric pressure

Question 17

What is the moment of a force?

Answer 17

It is the turning effect of a force

Question 18

What is the definition of gravitational field strength

Answer 18

Gravitational force per unit mass

Question 19

The greater the mass of an object?

Answer 19

The greater its weight

Question 20

What energy does an object possess at its highest point?

Answer 20

Gravitational Potentail Energy

Question 21

Heat transfer stops when?

Answer 21

When the substances reaches thermal equilibrium

Question 22

Define energy

Answer 22

• It cannot be created nor destroyed.
• It can be converted from one to another.
• The total energy in an isolated system remains constant

Question 23

Define Gravitational field strength

Answer 23

It is defined as the gravitational force in newtons that acts on a mass of one kilogram.

Question 24

What are examples of renewable sources of energy?

Answer 24

• Biofuels
• Geothermal energy
• Hydroelectric energy
• Wind energy
• Solar energy

Question 25

Work done SI unit

Answer 25

Joule (J)

Question 26

To convert square centimeters to square meters, you need to?

Answer 26

divide by 10,000 (100x100)

Question 27

How does a bimetallic strip work?

Answer 27

• Expands more so the top strip of the bimetallic strip is put on the outside of the curve (bent back and force other strip to follow)
• Contracts more so the top strip of the bimetallic strip is put on the inside of the curve (pull in like reigns)

Question 28

To convert pascals (Pa) to kilopascals (kPa), you need to?

Answer 28

divide the pressure in pascals by 1,000

Question 29

What is the worst heat conductor?

Answer 29

A vaccum. It cannot conduct heat since there are no particles in a vaccum.

Question 30

Define conduction

Answer 30

It is the transfer of heat from a hotter to colder region through contact between the two sources.

Question 31

Define conduction (upper sec)

Answer 31

It is a process whereby thermal energy is transferred
through collision of particles.

Question 32

How is heat transfered by solids ONLY!

Answer 32

Molecular vibration

Question 33

How is heat transfered by solids, liquids and gases

Answer 33

Collision of particles

Question 34

Why are solids better conductors than liquids/ gases?

Answer 34

Since conduction of heat occurs when two sources are in contact

Question 35

What is thermal conductivity?

Answer 35

A measure of the ability of a matter to conduct heat