Forces

Question 1

What is conduction?

Answer 1

Conduction is the transfer of heat energy in a solid by vibration and collision of particles

Question 2

What is convection?

Answer 2

Convection is the transfer of heat energy when particles in a fluid rise

Question 3

Radiation

Answer 3

Radiation is the method of transferring energy as a wave

Question 4

Name 3 simple machines

Answer 4

Lever pulley wheel and axel wedge screw inclined plane

Question 5

What is diffusion

Answer 5

Diffusion is when particles spread out from an area of high concentration to low concentration

Question 6

What is a thermal insulator?

Answer 6

A material that reduces how fast energy is transferred between a hot a cold object

Question 7

What is a thermal conductor?

Answer 7

A material that increases how fast energy is transferred between objects

Question 8

What is the input force?

Answer 8

The force applied to the machine

Question 9

What is the output force?

Answer 9

The force applied to the object being moved by the machine

Question 10

What is a lever?

Answer 10

A simple machine that consists of a rigid object that will rotate around the pivot

Question 11

What is a pivot?

Answer 11

A fixed point

Question 12

What is a moment?

Answer 12

A moment is the turning effect of a force

Question 13

What is the calculation to find the moment

Answer 13

Moment (nm) =force (n) x perpendicular distance (m)

Question 14

How to convert cm into m

Answer 14

/100

Question 15

How to convert meters into cm

Answer 15

X100

Question 16

What is work done

Answer 16

Work done is the amount of energy transferred when a force causes something to be displaced. When a force moves an object energy is transferred and work is done

Question 17

Calculation for work done

Answer 17

Work done (j)=force (n) x distance (m)

Question 18

Km into m

Answer 18

Km x 1000 =m

Question 19

What is displacement

Answer 19

The distance of an object moves from its starting point as measured in a straight line from that point

Question 20

Arrangement of particles in solids

Answer 20

Ordered lines all touching and vibrating. Strong force of attraction high density

Question 21

Arrangement of liquids

Answer 21

Random touching particles are moving around eachother weaker than solid attraction weaker than solid density

Question 22

Arrangement of gas

Answer 22

No touching particles are moving very quickly weak attraction very low density

Question 23

Particles …… energy as they get …..

Answer 23

Gain. Hotter

Question 24

As particles …….. energy they move ……

Answer 24

Gain. Faster

Question 25

Calculation for density

Answer 25

Density = mass/volume

Question 26

What is the difference between thermal energy and temperature

Answer 26

Temperature is a measure of how hot or cold a substance is . Thermal energy is a measure of the total movement energy in particles

Question 27

Give an example of an insulator

Answer 27

Wood plastic , polystyrene

Question 28

Give an example of a material that can conduct thermal energy

Answer 28

Metal

Question 29

What is infrared radiation

Answer 29

Infrared radiation is a electromagnetic wave That ha da wavelength slightly longer to red light. All hot objects give out infrared radiation