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I do not get how the normal is greater than the weight force. They should be equal and cancel each other, but then due to the centripetal force, the resultant is upwards. I do not know if I am wrong or right but this is what I have understood in all this videos. Isnt it possible that the normal is equal to mg but then the centripetal force acts and increases the Force so the force upwards, normal is increase by that centripetal force, but still the normal should be equal to the weight mg. Thank you, please let me know whether I am right or wrong and why. Thank you, making studying much easier
Free body diagrams only involve forces. They allow you to determine the net force which determines the acceleration which determines the motion (velocity)
I do not understand why you would express it as energy. The (radial) net force must equal mv^2/r for circular motion in the same way the Fnet=ma. a = v^2/r for circular motion.
Isn't the normal force always equal to the weight force? Thats why when we stand still we dont move up or down. Wouldn't it make more sense if the normal force was equal to the weight force plus the centripetal force for objects on earth because it effectively acts in the opposite direction and is of equal magnitude. Would this not also mean that a scale overestimates your weight, because it experiences both your weight force and the centripetal force acting on you?
A scale will read a slightly lower value than your weight due to the motion of the Earth. Somewhere around 0.2 N if I remember correctly. We usually ignore this. You are a rotating body, so it is not true that you have no acceleration, and therefore, the real forces acting will not be zero.
@17:14 If every object needs a downward force of 3N to the the center of the earth in order to move with earth's surface, what would happen to the objects that do not have this? For example, an object weighing 0.020kg (20g). It would have a weight of only 0.20N. Wouldn't it just slide off? I don't suppose the radius could be increased so much to allow for the 3N acceleration required. It would be great if you could answer this question of mine!
The weight will be less by 3N due to the rotation of the Earth. This is the net or centripetal force on the person. C is for contact force. This is the force from the surface of the Earth, and is equal to 781 N, 3N less than the actual weight.
