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Physics - MCAT > Class One > Flashcards

Class One Flashcards

1
Q

what are kinematics

A

description of motion in terms of an object’s position, velocity and acceleration

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2
Q

what is displacement

A

change in position of an object

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3
Q

what is velocity

A

tells us how fast an object’s position changes

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4
Q

velocity formula

A

displacement / time

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5
Q

speed is the..

A

magnitude of the velocity vector

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6
Q

characteristics of speed

A

has no direct & can never be negative

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7
Q

characteristics of velocity

A

specifies speed and direction

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8
Q

what is acceleration

A

how fast an object’s velocity changes

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9
Q

acceleration formula

A

change in velocity / time

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10
Q

if acceleration points in the same direction as initial velocity..

A

speed is increasing

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11
Q

if acceleration points in the direction opposite to initial velocity..

A

the speed is decreasing

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12
Q

what is uniformly accelerated motion

A

when an object’s acceleration is constant

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13
Q

slope of a position vs time graph gives..

A

velocity

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14
Q

slope of a velocity vs time graph gives..

A

acceleration

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15
Q

the area under a velocity vs time graph gives..

A

the displacement

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16
Q

what is free fall

A

an object moving only under the influence of gravity

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17
Q

gravitational acceleration

A

10 m/s2

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18
Q

free fall acceleration and mass

A

the free fall acceleration of an object does not depend on its mass

2 objects would fall at the same time

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19
Q

what is projectile motion

A

constant, downward acceleration due to gravity

20
Q

what is constant in projectile motion

A

horizontal motion velocity

21
Q

at the top of the parabola for projectile motion..

A

vertical velocity is 0

22
Q

symmetry of a parabola of projectile motion means..

A

the projectile’s total flight time will be twice the time required to reach the top

23
Q

horizontal displacement is also called..

A

range

24
Q

what is a force

A

a push/pull exerted by one object on another

25
Q

Newton’s first law

A

an object’s velocity will not change unless a net force acts on it

no net force = no acceleration

26
Q

what is inertia

A

object’s natural resistance to change in their state of motion

27
Q

Newton’s first law is also known as..

A

the law of inertia

28
Q

Newton’s second law

A

Fnet = ma

total force on an object = mass of object x acceleration

29
Q

what is force is not included in Fnet

A

forces exerted BY the object

30
Q

mass of object = positive so..

A

the direction of acceleration is always the same direction of Fnet

31
Q

Newton’s third law

A

the forces in an action-reaction pair have the same magnitude and act in opposite directions

**does not say that the effects of the forces will be the same

32
Q

weight vs mass

A

weight: gravitational force exerted on an object
mass: intrinsic property of an object

33
Q

Newton’s Law of Gravitation

A

the magnitude of the gravitational force the universe exerts on an on object is proportional to the product of the object’s masses and inversely proportional to the square of the distance between them

34
Q

Law of Gravitation formula

A
35
Q

what is friction

A

electrical attraction between atoms of one surface with those of another

+

roughness of surfaces

36
Q

categories of friction

A

static & kinetic (sliding) friction

37
Q

what is static friction

A

when there is no relative motion between the surfaces that are in contract (no sliding)

38
Q

what is kinetic friction

A

when there is relative motion between the surfaces

39
Q

what is normal force

A

the perpendicular component of the contact force exerted by a surface on an object

40
Q

force of kinetic friction formula

A
41
Q

the direction of the force of kinetic friction is always..

A

parallel to the surface

opposite direction to the object’s velocity

41
Q

the direction of the force of kinetic friction is always..

A

parallel to the surface

opposite direction to the object’s velocity

42
Q

the maximum coefficient of static force is always..

A

greater than the coefficient of kinetic force

43
Q

why is there only a maximum force of static friction formula

A

static friction is capable of supplying necessary force, but only up to a certain maximum

44
Q

the force due to gravity acting parallel to the inclined plane =

A

mg(sin∅)

45
Q

the force due to gravity acting perpendicular to the inclined plane =

A

mg(cos∅)

46
Q

what is a pulley

A

a device that changes the direction of tension that pulls on the object that the string is attached to

Physics - MCAT (6 decks)

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