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N5 Physics > Dynamics > Flashcards

Dynamics Flashcards

1
Q

what is friction

A

a resitive force that opposes motion, acts between 2 surfaces

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2
Q

what formula is used to calculate the resultant force

A

Fun=ma

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3
Q

unit and symbol for force

A

newton, F

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4
Q

unit and symbol for mass

A

kilogram, m

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5
Q

unit and symbol for weight

A

newton, w

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6
Q

unit and symbol for gravitational force

A

newtons per kg (Nkg-1), g

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7
Q

equation for weight

A

w=mg

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8
Q

what does a speed time graph with the line increasing from the 0 show

A

constant positive acceleration

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9
Q

what does a speed time graph with a horizontal line show

A

constant velocity, acceleration of 0ms-1

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10
Q

what does a speed time graph with a diagonal line crossing the x axis mean

A

constant negative acceleration, when the line crosses the x axis, the motion stops and accelerates in the opposite direction

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11
Q

what is distance

A

the route that is taken

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12
Q

what is displacement

A

durect straight line from start to finish

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13
Q

what is a scalar

A

fully described by size/magnitude and unit e.g 200s

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14
Q

what is a vector

A

fully described by magnitude, unit and direction e.g 800N(012)

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15
Q

what is a balanced force

A

object stationary or moving at a constant speed

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16
Q

what is an unbalanced force

A

object accelerating or decelerating

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17
Q

what is newtons 2nd law

A

if an overall resultant (or unbalanced) force is applied to an object, then the object will accelerate in the direction of the unbalanced force

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18
Q

what is newtons 3rd law

A

for every action, there is an equal and opposite reaction

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19
Q

what is newtons 1st law

A

an object will remain at rest or move at a constant velocity in a straight line unless acted on by an unbalanced force

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20
Q

how to calculate distance using a velocity time graph

A

add all areas under the graph and axis, above axis is positive, below axis is negative

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21
Q

how to calculate acceleration using a speed time graph

A

gradient of the graph

22
Q

what is work done

A

when an unbalanced force moves through a distance, energy is converted form one form to another

23
Q

is work a scalar or a vector

A

scalar

24
Q

what is the relationship between work, force and distance

A

Ew= Fd

25
Q

when is one joule of work done

A

when 1N moves through a distance of 1m

26
Q

what is power

A

rate at which work is done

27
Q

what are the units of power

A

watt (w)

28
Q

relationship between power, work and time

A

P=Ew/t

29
Q

what is one watt equal to

A

1 joule per second, Js-1

30
Q

is power a vector or a scalar

A

scalar

31
Q

what is gravitational potential energy

A

energy gained or lost by an objct moving vertically

32
Q

is gravitational potential energy a scalar or a vector

A

scalar

33
Q

what is the unit of gravitational potential energy

A

Joules

34
Q

relationship between potential energy, mass, height and gravitational field strength

A

Ep=mgh

35
Q

what is kinetic energy

A

energy an object has because of mass and motion

36
Q

is kinetic energy a vector or scalar

A

scalar

37
Q

unit of kinetic energy

A

Joules

38
Q

relationship between kinetic energy, mass and velocity

A

Ek=1/2 m v2

39
Q

symbol and unit for time

A

t, seconds

40
Q

symbol and unit for speed

A

v, ms-1

41
Q

symbol and unit for velocity

A

v, ms-1

42
Q

when are speed and velocity numerically equal

A

when an object travels in a straight line without changing direction

43
Q

symbol and unit for average speed

A

v’bar’ ms-1

44
Q

symbol and unit for avergae velocity

A

v’bar’ ms-1

45
Q

what is the sum of 2 or more vectors called

A

resultant

46
Q

how do you add vectors

A

nose to tail!

47
Q

what formula is used to calculate vertical motion

A

a=v-u
t

48
Q

what is the vertical acceleration on earth

A

9.8ms-2

49
Q

what is the formula used to calculate horizontal motion

A

v=d/t

50
Q

what are the 2 steps in analysing forces on an object

A

name the forces and identify direction
consider the size of the forces

51
Q

how do you add force in a straight lline

A

choose one direction to be positive and one to be negative

52
Q

how do you add a force at right angles

A

nose to tail!!!

N5 Physics (6 decks)

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