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Circular motion
A-level Physics
Unit G484: The Newtonian World
Circular motion: introduction
A-level Physics
Unit G484: The Newtonian World
Circular motion: introduction
Circular motion video
The wall of death LOs
Circular motion
To do
Draw a diagram showing the forces on the moving car (ignore air resistance).
Q. Which of these forces would exist if the car was stationary?
LO 1: describe motion in a circle in terms of acceleration and force
What’s going on? LOs
Circular motion
Learning objectivesAt the end of the lesson you will be able to:
Lesson focus• An introduction to circular motion
• describe motion in a circle in terms of acceleration and force;• use the equation for speed v = 2πr/T ; • define the radian;• convert angles from degrees into radians and vice versa.
Circular motion
Learning outcomes
All of you should be able to
• explain why an object moving in a circle is accelerating;
• describe the direction of this acceleration;
• explain why this object moves in a circle;
• describe the direction of the resultant force on the object;
• describe everyday examples of circular motion.
Some of you may be able to
• describe the origin of centrifugal forces.
Circular motion LO 1: describe motion in a circle in terms of acceleration and force
Moving in circles LOs
Circular motion LO 1: describe motion in a circle in terms of acceleration and force
Moving in circles LOs
Circular motion LO 1: describe motion in a circle in terms of acceleration and force
Moving in circles LOs
Circular motion
To do
1. Define acceleration.
2. What causes acceleration?
3. In what direction does acceleration happen?
Acceleration - recall LOs
Circular motion
Imagine a car travelling at a constant speed. It moves towards the right and
then, instantaneously, turns through ninety degrees.
u
v
To do
Use vector subtraction to work out the direction of the change of
velocity.
Changing direction is acceleration LOs
Circular motion
u
v
To doNow do the same thing for movement in a circle.
- u
v - u
LO 1: describe motion in a circle in terms of acceleration and force
Changing direction is acceleration LOs
Circular motion
uv
To doRepeat the exercise for a smaller movement.
- u
v - u
In which direction does the force causing the acceleration act as the change in direction becomes smaller?
LO 1: describe motion in a circle in terms of acceleration and force
Changing direction is acceleration LOs
Circular motion
Examples of circular motion LOs