Physics 1-2

Question 1

Define speed

Answer 1

Distance travelled per unit time

Question 2

Recall the equation of speed

Answer 2

V = S / T

Question 3

Recall the equation of average speed

Answer 3

Average speed = Total distance travelled / Total time taken

Question 4

Define mass

Answer 4

A measure of the quantity of matter in an object

Question 5

Define weight

Answer 5

The gravitational force on an object that has mass

Question 6

Define gravitational field strength

Answer 6

The gravitational force per unit mass

Question 7

Recall the equation of gravitational field strength

Answer 7

g = W / m

Question 8

State the the surface of the Earth, g

Answer 8

g = 9.8 N/kg

Question 9

Define density

Answer 9

Mass per unit volume

Question 10

Recall the equation of density

Answer 10

p = m / v

p= density
m= mass
v= volume

Question 11

If the object is denser than the fluid, it will …

Answer 11

Sink

Question 12

If the object is less dense than the fluid, it will …

Answer 12

Float

Question 13

Describe friction

Answer 13

The force between two surfaces that may impede relative motion and produce heating

Question 14

State how energy may be stored (7)

Answer 14

Kinetic
Gravitational potential
Chemical
Elastic (strain)
Nuclear
Electrostatic
Internal (thermal)

Question 15

How energy can be transfered (4)

Answer 15

Forces
Electrical currents
Heating
Waves

Question 16

State the melting point for water

Answer 16

0° C

Question 17

State the boiling point for water

Answer 17

100° C

Question 18

Define conduction

Answer 18

The transfer of thermal energy by the vibration of molecules

Question 19

Define convection

Answer 19

The trasfer of thermal energy through a fluid by the movement of the material itsel. Only with liquids and gases

Question 20

Cooler water is more dense so it

Answer 20

Sinks

Question 21

Hotter water is less dense so it

Answer 21

Rises

Question 22

Warm air is less dense so it

Answer 22

Rises

Question 23

Cold air is more dense so it

Answer 23

Sinks

Question 24

Define radiation

Answer 24

The transfer of thermal energy through empty space by electromagnetic waves

Question 25

Black and dull surfaces:

Answer 25

Absorb and emit thermal radiation efficiently

Question 26

White and shiny surfaces:

Answer 26

Reflect most thermal radiation and are poor at absorbing and emitting heat

Question 27

Shiny and smooth surfaces:

Answer 27

Reflect radiation, making them poor absorbers and emitters of thermal radiation

Question 28

Consequences of thermal energy transfer, conduction

Answer 28

Burns or heat loss if not managed

Question 29

Consequences of thermal energy transfer, convection

Answer 29

Can lead to uneven heating or cooling

Question 30

Consequences of thermal energy transfer, radiation

Answer 30

Burns or contributes to climate change