M5 Advanced Mechanics

Question 1

height from above ground

Answer 1

is usually the total height - the displacement for that time period

eg total vertical displacement is 100m downwards (half flight)

in 5 seconds, vertical displacement is 30m down

therefore height above ground is 70m

Question 2

practical investigation (proj)

Answer 2

aim: to determine the relationship between launch angle and range (half flight) (marble off a ramp off a table)

independent variable: launch angle
dependent variable: range of marble

Question 3

angular velocity formula

Answer 3

Question 4

banked tracks formula

Answer 4

tanθ = v²/rg

this is because mgtanθ = mv²/r

a car moving at this velocity could safely travel around a banked curve even if the road is covered with ice

Question 5

gravitational field strength formula (acceleration due to gravity)

Answer 5

g=GM/r²

Question 6

orbital velocity formula

Answer 6

Question 7

escape velocity formula

Answer 7

Question 8

what is escape velocity

Answer 8

The minimum velocity with which an object can escape the gravitational pull of the planet

Question 9

kinetic energy, GPE energy, total energy formula

Answer 9

Question 10

UNIFORM HORIZONTAL MOTION (normal and weight force)

DRIVING THROUGH A CIRCULAR DIP

DRIVING OVER A CIRCULAR HUMP

Answer 10

Question 11

During uniform circular motion, work…

Answer 11

is not done

Question 12

positive work is done on the object when

Answer 12

the radius of the motion increases

Question 13

negative work is done on an object when…

Answer 13

the radius of the motion decreases

Question 14

torque is

Answer 14

the effect of a rotational force

is the force that causes something to rotate

Question 15

there is no torque when

Answer 15

object is moving in uniform circular motion as the centripetal force is parallel to the radius

Question 16

Radian <==> Degree Conversion

Answer 16

Question 17

angular velocity and linear velocity relationship

Answer 17

v = wr

Question 18

leaning scenarios

Answer 18

Question 19

banking scenarios

Answer 19

θ is the same when the cyclist is perpendicular to the incline plane

Question 20

why is banking effective?

Answer 20

Banking the road
allows a component of the normal
reaction to contribute to the
centripetal force.

This increases the magnitude of
the net force and, therefore, the magnitude of the centripetal force keeping them in the curve.

Question 21

accuracy

Answer 21

how close a measurement is to the true value

Question 22

precision

Answer 22

how close the measurements are to each other

Question 23

reliability

Answer 23

will one get the same values if the measurements are repeated

Question 24

validity

Answer 24

are the values describing what was supposed to be measured

Question 25

2 types of earth orbits (qualitative)

Answer 25

Question 26

deep dive into low earth orbits

Answer 26

what is it?
satellite remains just outside the earth’s atmosphere throughout the whole orbit

key features?
key uses?
orbital decay?

Question 27

deep dive into geostationary orbits

Answer 27

what is it?
satellite maintains a position directly above a specific point on the Earth (point must be on the equator)

key features?
key uses?

Question 28

difference between geostationary orbits and geosynchronous orbits?

Answer 28

geosynchronous has (T = 24 hrs) however doesn’t have to be over equator

all geostationary orbits are geosynchronous BUT not all geosynchronous orbits are geostationary

Question 29

Answer 29

A

Question 30

escape velocity is

Answer 30