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science t 4 > everything > Flashcards

everything Flashcards

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1
Q

what is inertia?

A

the tendency of an object to oppose any change in its original state

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2
Q

what is newton’s first law of motion?

A

An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a external net force

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3
Q

mass?

A

it’s the total amount of matter, or “stuff,” in an object while weight is the force of gravity on an object

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4
Q

what is inertia of rest?

A

when no direct force is applied on an object

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5
Q

what is inertia of motion?

A

the tendency of an object in motion to stay in motion in a straight line at a constant speed unless acted upon by an unbalanced force

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6
Q

when does friction occur?

A

when irregular surfaces interlock

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7
Q

opposing forces that stop an object are…

A

frictional forces

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8
Q

smoother surfaces have…

A

less frictional force

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9
Q

friction also depends on…

A

how hard the surfaces of two objects are pushed against each other

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10
Q

higher the pressure…

A

the higher the frictional force

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11
Q

mass is:

A

a physical body’s resistance to acceleration when a net force is applied

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12
Q

acceleration =

A

how quickly a physical body changes its motion

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13
Q

physical body =

A

collection of mass

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14
Q

net force =

A

the force that is affecting the collection of mas/physical body

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15
Q

weight:

A

the force exerted on a body of gravity

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16
Q

1 pound is…

A

2.2 kg

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17
Q

Fnet =

A

net force

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18
Q

Fg =

A

force gravity

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19
Q

Fn =

A

force normal

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20
Q

Ft =

A

force thrust

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21
Q

downwash is…

A

the change in direction of air deflected by the aerodynamic action of an airfoil, wing, or helicopter rotor blade in motion

22
Q

which is greater: thrust or drag

A

thrust

23
Q

like poles will repel and opposites will…

A

attract

24
Q

do magnetic field lines cross?

A

no

25
Q

a compass always points in the direction fo the magnetic field it is close too, this is why…

A

compasses point north

26
Q

permanent magnets are…

A

always magnetic, like an actual magnet

27
Q

induced magnet…

A

acts normal, but if it goes inside another magnet’s field it becomes magnetic

28
Q

what is static electricity

A

still electricity/doesn’t move

29
Q

where is the south side of the magnet that is inside earth?

A

north pole, and visa versa

30
Q

what are three magnetic materials on the periodic table?

A

iron, nickel and cobalt

31
Q

how do you make steel?

A

you combine carbon and iron

32
Q

what is gravity?

A

the force that brings you back to the ground

33
Q

who first came up with the concept of gravity?

A

isaac newton in his book Principia (~1680)

34
Q

IF YOU DOUBLE THE MASS…

A

YOU DOUBLE THE FORCE OF GRAVITY!

35
Q

if you are closer to something…

A

you are closer to its gravitational field

36
Q

what keeps celestial objects in orbit?

A

gravitational force

37
Q

what is an example of opposing gravity?

A

holding something in your hand

38
Q

when we freefall, we are…

A

weightless, but gravity is still acting on us

39
Q

what is the theory of general relativity?

A

the mass of objects cause a disturbance in space time, which is felt as gravity

40
Q

weight is…

A

mass x gravity, therefore gravity is mass divided by weight

41
Q

grams and kg are units of…

A

mass

42
Q

to measure weight you can use a…

A

spring balance or force meter

43
Q

what is the gravitational force on earth?

A

9.83 meters per second squared

44
Q

on the moon, gravity is 1.6 m/s² which is about a quarter the size it is on earth…

A

…and coincidentally, the moon is roughly a quarter of the size of earth!

45
Q

the strength of a gravitational force depends on the…

A

mass of the object/celestial object/celestial being/size

46
Q

is gravity a contact or non-contact force?

A

non-contact

47
Q

is magnetic energy contact or non-contact force?

A

non-contact

48
Q

is friction contact or non-contact

A

contact

49
Q

when the size and direction of the forces acting on an object are exactly balanced…

A

…there is no net force, this is called an EQUILBRIUM

50
Q

are you going to fail your science test?

A

idk just study man

science t 4 (2 decks)

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