Physics: motion Flashcards
what three formulas describe motion under constant accelaration
what is the definition of velocity
velocity is defined as displacement per unit time
what formulas would be used to find the velocity of an object fired horizontally with a speed of V_H
what formulas would use to find the horizontal and vertical velocity of an object with speed v and shot at an angle theta
what formulas would be used to find the time of flight of an object fired horizontally with a speed of V_H
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
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
what formulas would be used to find the vertical displacement of an object fired horizontally with a speed of V_H
what for formulas would be used to calculate the vertical displacement of an object launched at an angle theta and a speed of v
what effect does changing the Height have on range when angle is kept constant
it increase the range as t increase because of “sub in formula” and therefore Vh increase because s=v*t
what effect does changing the launch angle have when H is kept constant
By decreasing the launch angle the Vh is increased. T is decreased by the increase in Vh is larger so Sh increases overall
why does a launch angle of 45 degrees optimize range
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
what factors effect drag force and why
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.
what is the unit for momentum
sN or kg m s−1
what is the law of conservation of momentum
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
what is centripetal accelaration
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.
what is uniform circular motion
uniform circular motion is when an object travels at a constant speed in a circular path
what is the formula used to find minimum banking angle
what units are used to measure gravitational field strength
Nkg-1 or ms^-2
what is Kepler’s first law of planetary motion
all planets move in elliptical orbits with the sun at one focus
what is Kepler’s second law of planetary motion
a line drawn from the center of the sun to the center of the planet sweeps the same area over equal time intervals
what is Kepler’s third law of planetary motion
the period of revolution of a satellite squared is proportional to the radius of the orbit cubed
what is Newtons first law
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.
what is Newtons second law
the greater the mass of an object, the more force it will take to accelerate the object
what is Newtons third law
Whenever one object exerts a force on another object, the second object exerts an equal and opposite on the first.
what is an inertial frame of reference
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
what are the two postulates of the theory of special relativity
- the speed of light is an absolute constant.
- the laws of physics are the same in all inertial frames of reference
the concept of simultaneity
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
what is a proper unit
a proper unit is when something is measured in a reference frame of which such thing being measured is at rest
what is time dilation
time dilation is the slowing down of clocks that are in motion relative to the observer
what is length contraction
length contraction is the decrease if length of an object in motion relative to an observer
what is relativistic mass
relativistic mass is when the mass of an object increases relative to a stationary observer
what is coulombs law
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
