Circular Motion Flashcards
What is 1 radian?
The angle subtended by an arc of length r.
Define an angle.
The ratio of the arc that subtends the angle to the radius of the circle.
How do you calculate angular velocity?
Angular velocity = theta / time.
Theta = ratio of s (arc length) to r (radius).
Or, a.v. = velocity / radius
How do you calculate the period?
T = 2pi / angular velocity.
How do you calculate force acting in a circle?
F (or T)=mv^2/r
How do you calculate the force with angular velocity?
F=mass x angular velocity^2 x radius.
How do you calculate the angle in a pendulum?
Tan theta = v^2/gr
How do you calculate tension for an object moving in a circle?
T = mv^2/r + mg at top of circle. T = mv^2/r - mg
How do you calculate the force of attraction between two objects?
F = -GMm/r^2
G=6.67x10^-11
Define gravitational field.
A region in which a force operates.
What did Newton say about gravitational attraction.
The force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
What is the equation for force on a mass within an object?
F on M = -G4/3ppir
P=density
How do you calculate gravitational field strength within an object?
Field = 4/3Gpirp
How do you calculate the speed of a satellite?
V^2 = GMe/r where r = distance from centre of earth.
How do you calculate the period of a satellite?
T^2 = 4pi^2r^3/GM.
