CIRCULAR MOTION Flashcards
What is needed for a object to travel in a circle.
For an object to travel in a circle must be a resultant force towards the centre of the circle.
Since resultant force, object always accelerating towards the centre.
What is the resultant force towards the centre known as?
The centripetal force.
What happens to the object if the centripetal force is removed.
Travels in a straight line at tangent to the circle.
Describe how an object moving in a circle is accelerating even though its speed is constant?
Velocity is a VECTOR so has both DIRECTION and MAGNITUDE.
Acceleration is defined as the RATE OF CHANGE OF velocity.
As object moves in a circle, its direction is CONTINUOUSLY CHANGING therefore velocity is changing so object is ACCELERATING.
Magnitude of velocity is CONSTANT hence SPEED is constant.
How to work out maximum speed a car can go without leaving the road on a hill.
This happens when reaction force is equal to zero.
This means resultant force is equal to the weight - reaction force.
Therefore Weight is equal to the resultant force.
V = Root rg
Explain why a object in a bucket being rotated in a vertical circle won’t fall out if swung fast enough?
Water will fall at a rate of g.
If bucket falls at a rate of g or greater than g water will not be able to fall faster than the bucket.
When centripetal acceleration of the bucket is equal to or greater than g water stays in.
a = g
V = root rg
