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p5 Flashcards

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Physics 101 flashcards AP® Physics flashcards
1
Q

what is a force

A

a push or pull that acts on an object due to its interaction with another object

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2
Q

what do u measure force in

A

newtons

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3
Q

what do u need to know about forces

A

direction

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4
Q

what categories can force be devided to

A

contact and no contact forces

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5
Q

what is contact forces

A

when the two objects are physically touching
for example friction and air resistance tension reaction force

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6
Q

what is non contact forces

A

that don’t require touching

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7
Q

explain reaction force

A

for example a rock on a table the rock has mass resting a force downwards which is it weight from keep it from falling the table should be exerting a equal opposite force upwards contact force

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8
Q

what are the 3 types of no contact forces

A

magenetic electrostatic force gravitational force

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9
Q

what is gravity forces of attraction

A

its between any two objects that have mass like the earth and a person

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10
Q

can magnetic force be attractive and repulsive

A

yes they can be both

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11
Q

what will the strength of the objects do if they get further apart

A

they will decrease

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12
Q

what do other scalars quantity consider include

A

distance mass temperature and time

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13
Q

what do vectors have but not scalars

A

direction

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14
Q

what are the 5 types of vectors

A

velocity displacement acceleration momentum force

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15
Q

scalars quantity doesn’t give us any direction on going

A

only magnitude

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16
Q

give a example of a vector

A

displacement and direction for example I walked 3km east

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17
Q

can vectors go negative number of direction and displace meant

A

yes

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18
Q

what dose it mean by free body diagrams

A

they mean simple diagrams that show all the forces that are acting in a particular object we do this using force arrows

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19
Q

what are the free body diagrams of a plane

A

one will be going forwards as thrust backwards drag down weight up lift all the classed as vectors ( direction arrows as mag)

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20
Q

because the forces of the plane are acting in different directions

A

some of them will cancel each other out what we will have lest is the resulting force which is the overall force on an object

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21
Q

what do we call it when there’s no resulting force on an object

A

we call it equlilbrium

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22
Q

what happens if an object changes shape we say its

A

beging deformed

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23
Q

what are the two kind of deformed

A

elastic and inelastic

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24
Q

what is extension

A

the increase in length of spring when its streached

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25
Q

for example of extension

A

if we hang a spring from its support wed can measure how the spring length changes as we add downwards force to the bottom of the spring for example weight pulls on the spring then we can measure spring doesn’t fall its begging equally balanced

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26
Q

the higher the spring Constance

A

the weaker the force

27
Q

can u have more than one object acting in one

A

yes you can seasowr

28
Q
A

in between the pivot of the force

29
Q

what does a lower spring constant mean

A

its easier to stretch

30
Q

is speed classes as a scalar

A

yes

30
Q

what is a velocity calssed as a vector or a scalar

A

vector

31
Q

what is a distance calssed as a scalar or vector

A

is a scalar as it only give magnitude like 10m and 4miles

32
Q

what is displacement calssed as a vecter or a sacalor

A

is a vector as it has direction as well like a person running 40 m east

33
Q

was is acceleration

A

the rate of change in a velocity

34
Q

acceleration example

A

if it took a car to accelerate from15m/s to 35m/s to find out acceleration ww will take the change in velocity with is 35-15 + 20m/s then divide it by the time of 5 seconds + 4m/s squared

35
Q

what dose the flat line tells js in a distance time graph

A

that the person is stationary moving

36
Q

how do u calculate the speed with a tangent

A

that has the exact the same graditant bY picking the bottom of the target and the middle

37
Q

how do u fine the gradient of a line

A

change in distance divided by the change in time

38
Q

how do u work out the gradient in the velocity time graph

A

change in velocity divided by the change in time

39
Q

what dose the steeper line in the velocity time graph mean

A

the gradient is increasing

40
Q

how do u work out the distance travelled in the velocity time graph

A

calucclat the area of triangle 1(2 times the number the line stops times by were it reaches ten draw a rectangle and do the are of that then plus the answer

41
Q

termal velocity some steps out of a plane

A

the person has at stationary standing still has a mass gravity pull them downwards called weight they will feel the weight will stay the same as the resultant force id the combination of all the force acting on a object the resulting force will cause them to accelerate downwards as soon as the persons starts falling the person is in act to air resistant the sir restart and drag is due to the tiny air particles that make up the Air Force of air restart will be low

42
Q

what will react the air particles when a person is falling

A

the surface area of the person and the velocity in which the prowl is moving collide

43
Q

what will the result in force do when a person is falling by the same amount of air resistance if increase in velocity

A

the result in force will decrease as the air resistance will increase

44
Q

what happens to acceleration if we increase the velocity

A

the rate of acceleration will fall

45
Q

how dose thermal velocity happen when person if falling

A

the velocity will get so high will increase the same size as the weight which now the two opposing forces will now balance each other out weight as air resistance which means they will be zero result in force then the person will stop accelerating mean velocity won’t change which is the thermal velocity

46
Q

what happens if the person decides to open up they parachute

A

they surface area will increase massively and the air resistance the result in air will now be upwards and accelerate upwards = slow down fall slowly more they slow down slower air resistance will be samller and smaller until air resistance will be equal to the weight again result in force will be zero person will reach new thermal velocity new thermal velocity will be lower then without the parachute

47
Q

what is newtons first law

A

that a result in force I required to change the motion of an object works for stationary and moving objects

48
Q

what is newtons second law

A

if a non zero result in force acts on an object then it will cause the object to accelerate

49
Q

what are the 5 different things happening on newtons second law

A

if we took a particle and draw some unbalanced forces it will be result in force to the right bigger then left arrow the particle will accelerate to the right for example
if it started stationary the acceleration would cause it to start moving to the right
then if its already moving to the right it will cause it to speed up
if the object was travelling tenth left then the right words acceleration will cause it to slow down
if it was trawling to the left more slowly it can cause to stop moving entirely
it can just result in a change in direction

50
Q

what is the equation for newtons second law

A

realist in force = mass of the object times acceleration

51
Q

what is newton third law

A

is when two object interact the forces that exert on each other our equal and opposite the opposite means the direction and equal means the magnitude

52
Q

for example of newtons third law

A

if we were to push a box of 100newtons the back will push back 100newtons we call this force that the box is exerting the normal contact force

53
Q

what is the thinking distance

A

how dar the car travels during the divers reaction time how long itvtakes for the person to see the hazard and apply the brake

54
Q

what types of thinks detract thinks distance

A

tried
drug
ditractions

55
Q

what is braking distance

A

how long it takes to the car to stop once the brake has been applied

56
Q

what affects the braking distance

A

faulty brake
weathers of the today icy snow condition a tyres

57
Q

what happen if we are travels at hight speed would it take longer to stop orb shorter

A

longer

58
Q

Is air resistance a contact or non-contact force? Explain why.

A

air resistance is a contact force this is because due to the physical contact colliosn between the object and air particles

59
Q

A moving object that has no resultant force acting upon it will:

A

continue moving at the same velocity

60
Q

A 20 m displacement North is the same as:

A
  • 20 displacement south
61
Q

what is result in force

A

equal to the sum of the forces acting on an object

62
Q

when the forces of the plane act in different directions some are going to cancel each other out what force do we have left

A

the result in force

63
Q

what piece of equipment can be used to measure an objects weight

A

newton meter

physics (6 decks)

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