- #1
Delzac
- 389
- 0
hi i hope that u are able to help me with these concept problems.
Q1. My teacher said that centrifugal force is aa imaginary force and that is does exist, is this true? i quote(from my teacher) " last time people thought that centrifugal force exist, but in actual fact it is a imaginary force which does not exist"
Q2. we know that the Earth is orbiting around the sun, circular motion requires that there be a centripetal acceleration towards the sun. If there is a acceleration towards the sun, shouldn't the Earth fly towards sun and collide together??
Q3. Say we have a eraser, and we put is on a spinning disc. when the rotation of the disk is slow, the eraser doesn't fly off because of friction. Now the problem arises that my teacher told me that frictional force is actually equal to centripetal force( magnitude and direction), but at any instant, the rubber's velocity is tangential to the radius, so shouldn't there be also a frictional force opposing this velocity in the apposite direction of the velocity? If this is the case, there there will be 2 frictional forces acting on the eraser instead of one.( The one which is Frictional force = centripetal force)
Q4. say we are pendulum, and we make is osscilate in a circular motion, should there be a outwards force? my teacher said that there isn't.( His explanation isn't very comprehensive)
Q1. My teacher said that centrifugal force is aa imaginary force and that is does exist, is this true? i quote(from my teacher) " last time people thought that centrifugal force exist, but in actual fact it is a imaginary force which does not exist"
Q2. we know that the Earth is orbiting around the sun, circular motion requires that there be a centripetal acceleration towards the sun. If there is a acceleration towards the sun, shouldn't the Earth fly towards sun and collide together??
Q3. Say we have a eraser, and we put is on a spinning disc. when the rotation of the disk is slow, the eraser doesn't fly off because of friction. Now the problem arises that my teacher told me that frictional force is actually equal to centripetal force( magnitude and direction), but at any instant, the rubber's velocity is tangential to the radius, so shouldn't there be also a frictional force opposing this velocity in the apposite direction of the velocity? If this is the case, there there will be 2 frictional forces acting on the eraser instead of one.( The one which is Frictional force = centripetal force)
Q4. say we are pendulum, and we make is osscilate in a circular motion, should there be a outwards force? my teacher said that there isn't.( His explanation isn't very comprehensive)