16. Circular Motion

Question 1

What is the formula for angle in radians?

Answer 1

Arc length/radius

Question 2

What is 360 degrees in radians?

Answer 2

2pi

Question 3

Define angular velocity. What is it measured in?

Answer 3

Angular velocity(w) of an object moving in a circular path is defined as the rate of change of an angle. Measured in Radians per second

Question 4

Define centripetal force

Answer 4

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

Question 5

What is centripetal force perpendicular to? What does this mean?

Answer 5

the velocity. the c.f has no component in the in the direction of motion and so no work is done on the object

Question 6

What are the two formulas for linear velocity?

Answer 6

2pi x r / T
v = wr

Question 7

What is linear velocity directly proportional to?

Answer 7

to the radius, if radius doubles then linear velocity doubles

Question 8

What is difference between linear velocity and angular velocity?

Answer 8

Linear velocity = tangent line to circle
Angular velocity = circumference line of circle

Question 9

Define centripetal acceleration

Answer 9

the acceleration of any object travelling in a circular path at constant speed

Question 10

How is speed and centripetal force related?

Answer 10

Greater the speed of the object, greater the centripetal force as the radius will be greater.