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Physics > Physics: motion > Flashcards

Physics: motion Flashcards

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1
Q

what three formulas describe motion under constant accelaration

A
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2
Q

what is the definition of velocity

A

velocity is defined as displacement per unit time

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3
Q

what formulas would be used to find the velocity of an object fired horizontally with a speed of V_H

A
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4
Q

what formulas would use to find the horizontal and vertical velocity of an object with speed v and shot at an angle theta

A
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5
Q

what formulas would be used to find the time of flight of an object fired horizontally with a speed of V_H

A
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6
Q

what for formulas would be used to calculate the time of flight of an object launched at an angle theta and a speed of v

A
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7
Q

what for formulas would be used to calculate the time of flight of an object launched at a Hight of H an angle theta and a speed of v

A
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8
Q

what formulas would be used to find the vertical displacement of an object fired horizontally with a speed of V_H

A
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9
Q

what for formulas would be used to calculate the vertical displacement of an object launched at an angle theta and a speed of v

A
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10
Q

what effect does changing the Height have on range when angle is kept constant

A

it increase the range as t increase because of “sub in formula” and therefore Vh increase because s=v*t

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11
Q

what effect does changing the launch angle have when H is kept constant

A

By decreasing the launch angle the Vh is increased. T is decreased by the increase in Vh is larger so Sh increases overall

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12
Q

why does a launch angle of 45 degrees optimize range

A

it is because at 45 degrees both Vh and Vv are equal. this means that the time of flight is optimized for the vertical component

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13
Q

what factors effect drag force and why

A

Speed- the faster an object moves the more particles it collides with. drag force increase by square fo is speed doubles drag quadruples.
Cross-sectional area- cross sectional area is directly proportional to drag. and the larger something is the more particles it hits.
density of the medium- the denser the medium is the more particles there are therefore the more particles the object will collide with.
shape- an object with a stream line body allow particles of flow over an around them decreasing there drag coefficient.

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14
Q

what is the unit for momentum

A

sN or kg m s−1

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15
Q

what is the law of conservation of momentum

A

the Law of conservation of momentum states that in an isolated system there there are no external forces. the total momentum before an interaction will e equal to the total momentum after an interaction

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16
Q

what is centripetal accelaration

A

the accelaration experienced by an object undergoing uniform circular motion always act perpendicular to the objects velocity and towards the center of the circular path.

17
Q

what is uniform circular motion

A

uniform circular motion is when an object travels at a constant speed in a circular path

18
Q

what is the formula used to find minimum banking angle

A
19
Q

what units are used to measure gravitational field strength

A

Nkg-1 or ms^-2

20
Q

what is Kepler’s first law of planetary motion

A

all planets move in elliptical orbits with the sun at one focus

21
Q

what is Kepler’s second law of planetary motion

A

a line drawn from the center of the sun to the center of the planet sweeps the same area over equal time intervals

22
Q

what is Kepler’s third law of planetary motion

A

the period of revolution of a satellite squared is proportional to the radius of the orbit cubed

23
Q

what is Newtons first law

A

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

24
Q

what is Newtons second law

A

the greater the mass of an object, the more force it will take to accelerate the object

25
Q

what is Newtons third law

A

Whenever one object exerts a force on another object, the second object exerts an equal and opposite on the first.

26
Q

what is an inertial frame of reference

A

an inertial frame of reference is one in which newtons laws of motion apply. an inertial frame of reference is therefore either stationary or moving with a constant velocity

27
Q

what are the two postulates of the theory of special relativity

A
  1. the speed of light is an absolute constant.
  2. the laws of physics are the same in all inertial frames of reference
28
Q

the concept of simultaneity

A

two events that are simultaneous in one frame of reference will not be simultaneous in a frame of reference that is moving with respect to the other

29
Q

what is a proper unit

A

a proper unit is when something is measured in a reference frame of which such thing being measured is at rest

30
Q

what is time dilation

A

time dilation is the slowing down of clocks that are in motion relative to the observer

31
Q

what is length contraction

A

length contraction is the decrease if length of an object in motion relative to an observer

32
Q

what is relativistic mass

A

relativistic mass is when the mass of an object increases relative to a stationary observer

33
Q

what is coulombs law

A

the electric forces of attraction or repulsion are directly proportional to the product of the two charges and inversely proportional to the square of the distance between centers

Physics (5 decks)

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