Circular Motion

Question 1

Define radian:

Answer 1

angle subtended at the centre of a circle by an arc that is equal in length to the radius

Question 2

How many degrees are in 1 radian?

Answer 2

180

Question 3

How do you convert radians to degrees?

Answer 3

(arc length)/radius

Question 4

How do you convert degrees to radians?

Answer 4

2π x (angle)/360

Question 5

Define angular velocity:

Answer 5

rate of change of the angle (2πf)

Question 6

What is centripetal force?

Answer 6

any force that keeps a moving body with uniform speed along a circular path

Question 7

What is centripetal force perpendicular to?

Answer 7

velocity of the object

Question 8

What is linear speed?

Answer 8

distance an object covers per unit time

Question 9

How do you calculate linear speed?

Answer 9

radius x 2πf

Question 10

What is centripetal acceleration?

Answer 10

when an object is moving in a circle speed is constant but velocity changes due to direction

Question 11

How do you calculate centripetal acceleration?

Answer 11

w²r or v²r

Question 12

How do you calculate centripetal force?

Answer 12

(mv²)/r or mw²r²

Question 13

Within an object moving in a circular motion how do you calculate resultant force?

Answer 13

difference between weight and support force (mg-s)

Question 14

When a moving object loses contact with the floor what has happened?

Answer 14

if its speed is equal to or greater than v0 which happens if support force is 0.