Cowen Physics - Everything to know

Question 1

What is pico in standard form

Answer 1

x10^-12

Question 2

What is nano in standard form

Answer 2

x10^-9

Question 3

What is micro in standard form

Answer 3

x10^-6

Question 4

what is milli in standard form

Answer 4

x10^-3

Question 5

what is centi in standard form

Answer 5

x10^-2

Question 6

what is kilo in standard form

Answer 6

x10^3

Question 7

what is mega in standard form

Answer 7

x10^6

Question 8

what is giga in standard form

Answer 8

x10^9

Question 9

what is tera in standard form x10^12

Question 10

what is a newton

Answer 10

the force which gives a mass of 1kg an acceleration of 1ms^-2

Question 11

what is a joule

Answer 11

the work done by a force of 1n moving an object 1m in the direction of the force

Question 12

what is a watt

Answer 12

the power transferred by one joule per second

Question 13

what is displacement

Answer 13

the distance moved by an object in a particular direction

Question 14

what is instantaneous speed

Answer 14

the speed at the precise instant that is measured ( cars speedometer )

Question 15

average speed

Answer 15

the speed calculated during a period of time

Question 16

what is speed

Answer 16

rate of change of distance

Question 17

what is velocity

Answer 17

rate of change of displacement

Question 18

what is acceleration

Answer 18

rate of change of velocity

Question 19

what is density

Answer 19

mass/volume

Question 20

equation for torque of a couple

Answer 20

one of the forces x perpendicular distance between the forces

Question 21

moment of a force

Answer 21

force x perpendicular distance from pivot

Question 22

what is the work done by a force

Answer 22

force x distnace moved in the direction of the force

Question 23

what is power

Answer 23

rate of work done

Question 24

force constant of a spring

Answer 24

force per unit extension

Question 25

what is a scalar

Answer 25

a quantity with magnitude only

Question 26

what is a vector

Answer 26

a quantity with both magnitude and direction

Question 27

what is terminal velocity

Answer 27

the velocity of a falling object when weight = drag

Question 28

what is the centre of gravity

Answer 28

a point where the entire weight of an object appears to act

Question 29

what is thinking distance

Answer 29

the distance travelled by the car in the time taken by the driver to react

Question 30

what is the braking distance

Answer 30

the distance travelled by the car after the brakes are applied until the car stops

Question 31

what is the stopping distance

Answer 31

thinking distance + braking distance

Question 32

what is the principle of conservation of energy

Answer 32

enery cannot be created or destroyed; it can only be transferred into other forms

Question 33

principle of moments

Answer 33

for an object in equilibrium, the sum of the clockwise moments about a point = the sum of the anticlockwise moments about the same point

Question 34

what is hooke’s law

Answer 34

extension of a spring is proportional to the force applied (as long as the elastic limit is not exceeded)

Question 35

stress =

Answer 35

force / area

Question 36

strain =

Answer 36

extension/original length

Question 37

Young modulus

Answer 37

stress / strain as long as the elastic limit is not exceeded

Question 38

ultimate tensile strength

Answer 38

breaking stress of a material

Question 39

elastic deformation

Answer 39

material returns to original shape when the force is removed

Question 40

plastic deformation

Answer 40

material does not return to original shape when the force is removed