Circular Motion

Question 1

What is frequency in circular motion?

Answer 1

The number of rotations per second.

Question 2

What is the time period in circular motion?

Answer 2

The time taken to complete one rotation.

Question 3

What is the equation relating frequency and time period?

Answer 3

F=1/T

Question 4

What is the angular speed?

Answer 4

The angle covered per second.

Question 5

What equation links speed and time period?

Answer 5

V=2(pi)f/T

Question 6

What equation links speed and frequency?

Answer 6

V=2(pi)rf

Question 7

How do you convert from degrees to radians?

Answer 7

Radians = degrees x (pi)/180

Question 8

How do you convert from radians to degrees?

Answer 8

Degrees = radians x 180/(pi)

Question 9

What is the equation to find angular speed?

Answer 9

(Theta)/(time)

Question 10

What equation links angular speed and frequency (radians)?

Answer 10

(Omega) = 2(pi)f

Question 11

What equation links angular speed and time period (radians)?

Answer 11

(Omega) = 2(pi)/T

Question 12

How do you find arc length?

Answer 12

L=r x (theta)

Question 13

What is always true for velocity in circular motion?

Answer 13

Velocity is tangential to the circle.

Question 14

What is acceleration?

Answer 14

The rate of change of velocity.

Question 15

Where does the acceleration act? What is this called?

Answer 15

Towards the centre. Centripetal acceleration.

Question 16

How does the increase of speed effect the centripetal acceleration?

Answer 16

Increases the centripetal acceleration.

Question 17

How does the increased distance of the radius affect centripetal acceleration?

Answer 17

Decreases the centripetal acceleration.

Question 18

What formula links speed and centripetal acceleration?

Answer 18

a=v^2/r

Question 19

What formula links angular speed and centripetal acceleration?

Answer 19

a=(omega)^2 x r

Question 20

What is a centripetal acceleration caused by?

Answer 20

A resultant force (centripetal force).

Question 21

How does an increase in speed affect the magnitude of centripetal force?

Answer 21

Increased speed means increase acceleration means increased force.

Question 22

How does an increased radius affect the magnitude of centripetal force?

Answer 22

Increase radius means decreased acceleration means decreased force.

Question 23

How does an increase of mass affect the magnitude of centripetal force?

Answer 23

Increased mass means increased force.

Question 24

What formula links mass, velocity, radius and centripetal force?

Answer 24

F=mv^2/r

Question 25

What formula links mass, angular speed, radius and centripetal force?

Answer 25

F=m(omega)^2/r

Question 26

What is the formula for centripetal force when going over a bridge?

Answer 26

F=mg-N

Question 27

What is the formula for centripetal force when at the top of a ferris wheel?

Answer 27

F=mg-N(top)

Question 28

How are Normal Reaction Force and mg related at the top of a ferris wheel?

Answer 28

N(top) < mg

Question 29

What is the formula for centripetal force at the bottom of a ferris wheel?

Answer 29

F=N(bottom)-mg

Question 30

How is the Normal Reaction Force and mg related at the bottom of the ferris wheel?

Answer 30

N>mg

Question 31

What is the formula for the centripetal force when a car is at the top of a loop the loop?

Answer 31

The car will be upside down, so: N(top) + mg = F

Question 32

What is the formula for centripetal force at the bottom of a loop the loop?

Answer 32

F = N(bottom) - mg

Question 33

When is the reaction force the greatest?

Answer 33

Bottom

Question 34

When is the reaction force the least?

Answer 34

Top

Question 35

What happens to the normal reaction force when the car loses contact at the top of a bridge?

Answer 35

N=0

Question 36

What formula is used to find the speed at which the car loses contact with the bridge?

Answer 36

v=(square root) g x r

Question 37

What happens at the top of a loop?

Answer 37

The object briefly loses contact, N=0

Question 38

What formula is used to find the minimum speed a car needs to be travelling to stay in contact?

Answer 38

v = (square root) g x r