Chapter 2 - Circular Motion Flashcards
What is the speed of a point object/point on the perimeter of an object in circular motion?
2{pi}r Circumference
T Time for 1 rotation
Alternatively v= 2{pi}rf
What is an object which is rotating at a steady rate said to be in?
Uniform Circular Motion
What is the formula for Angular Displacment?
2{pi}t for a certain time (t)
T
What is the angular displacement?
The angle in radians an object in uniform circular motion turns through in a set time
What is the angular speed?
It is the angle in radians an object rotates through per second.
What is the unit of angular speed?
Radians per second (Rad s^-1)
What is the equation for linking linear speed and angular speed?
v=rw
Why does an object accelerate when in circular motion?
Velocity is a vector so as the object changes direction so does the velocity and a change in velocity is an acceleration.
Which direction does velocity act, in circular motion?
Along the tangent to the circle at the specific point it is at
What direction does acceleration act in circular motion and why?
Centripetal acceleration acts towards the centre of the circle as velocity changes towards the centre of the circle.
What is the formula for centripetal acceleration?
v^2
r
What is used to achieve higher speeds without skidding when travelling in circular motion?
Banked track is used in order to achieve higher speeds due to the support forces on the vehicle contributing to the centripetal force; making it stronger.
What is centripetal force?
The resultant force acting on an object moving in circular motion at constant speed
How are centripetal force and centripetal acceleration similar?
They both act towards the centre of the circle
What are examples of centripetal force which relate to other chapters in the unit?
Gravitational Force on a small mass
Magnetic Force on a charged particle
