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science 6 > chapter 1 gravity and motion > Flashcards

chapter 1 gravity and motion Flashcards

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1
Q

why do objects fall to the ground at the same rate

A

the acceleration due to gravity

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2
Q

what does a acceleration depend on

A

force and mass

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3
Q

does a heavier objects experience a greater gravitational force then lighter object

A

yes

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4
Q

it’s a heavier object harder to accelerate because it has more mass

A

yes

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5
Q

does the extra mass of the heavy object exactly balance the additional gravitational force

A

yes

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6
Q

what is the rate at which velocity changes over time

A

acceleration

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7
Q

what is the objects change in velocity divided by the amount of time during which the change occurred

A

A acceleration of an object

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8
Q

what rate towards the Earth accelerates all objects

A

9.8 m/s squared

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9
Q

what is the force that opposes the motion of objects through the air

A

Air resistance

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10
Q

what does the amount of air resistance acting on the object depend on

A

size shape and speed of an object

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11
Q

as the speed of a falling object increases air resistance_______

A

increases

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12
Q

what is an object that falls at a constant velocity

A

terminal velocity

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13
Q

is terminal velocity a good thing

A

yes

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14
Q

what happens when only gravity is pulling something down and no other forces are acting on it

A

free fall

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15
Q

can freefall occur where there is no air

A

yes

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16
Q

what is the measure of gravitational force

A

weight

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17
Q

what does the size of the force depend on

A

The masses of an object in the distance between them

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18
Q

why do astronauts float

A

because they’re orbiting

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19
Q

in free fall are astronauts in freefall or are they orbiting

A

both

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20
Q

what is the Unbalanced force that causes objects to move in a circular path

A

centripetal force

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21
Q

what is the curved path an object follows when it is thrown or propelled the surface of the earth

A

projectile motion

22
Q

what happens in projectile motion when two motions are combined

A

they form a curved path

23
Q

what are the two ways that projectile motion can be thrown

A

horizontal and vertical motion

24
Q

gravity pool everything on earth downward toward the center of the earth

A

yes

25
Q

what law says an object at rest remains at rest and an object in motion remains in motion at a constant speed in a straight line unless acted on by an unbalanced force

A

newtons 1 law

26
Q

what happens to a object in rest

A

it remains in rest

27
Q

what happens to object in motion

A

they remain in motion

28
Q

l is it true that an object in motion will stay in motion forever unless it is acted on by an unbalanced force

A

yes

29
Q

why is observing newtons first law difficult

A

because of friction

30
Q

what is newtons first law of motion sometimes called

A

law of inertia

31
Q

what is the tendency of all object to resist any change in motion

A

inertia

32
Q

what happens in the inertia

A

an object in the rest will remain at rest until a fourth make it move

33
Q

what is the measure of a Inertia

A

mass

34
Q

is it true that an object that has a small mass has less Inertia

A

yes

35
Q

what law says the accleration of an object depends on the mass of the object in the amount of force applied

A

Second

36
Q

does acceleration depend on mass

A

yes

37
Q

does acceleration depend on force

A

yes

38
Q

if you use more force will acceleration increase

A

yes

39
Q

what is new in second law mathematically

A

force = mass•accleration

40
Q

what law says whenever one object exerts a force on a second object the second object exerts an equal opposite force on the first

A

3

41
Q

do all forces act in pairs

A

yes

42
Q

is a force always exerted by on object on another object

A

yes

43
Q

how do the forces acting pairs for newtons third law

A

action and reaction

44
Q

what depends on the objects mass and velocity

A

momentum

45
Q

if an object has more momentum what is it harder to do

A

stop the object or change its direction

46
Q

what is the equation of momentum

A

p=m•v

47
Q

what happens with the momentum when an moving object hits another object

A

the momentum is transferred

48
Q

what happens when the momentum is transferred

A

the rest of the momentum stays with the first object

49
Q

what states that anytime objects collide the total amount of momentum stays the same

A

law of conservation of momentum

50
Q

what happens when objects bounce of each other

A

the momentum is transferred from one object to another

51
Q

Who argued that the mass of an object does not affect the time the object takes to fall to the ground

A

Galileo Galilei

science 6 (1 decks)

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