Try the Acceleration link. Learn three different cases.
1) Static Friction, not yet moving. (Acceleration zero, Speed zero)
2) Kinetic Friction, started moving. (Acceleration positive, Increasing speed)
3) Equal the forces after it started moving. (Acceleration zero, constant speed)
Apparent Weight in a Giant Wheel.
2 kg block kept on weighing balance.
Observe the weight changing continuously, fluctuating between 1.1 kg to 3.0 kg depending upon whether the cart is on the top or in the bottom.
On the top centripetal force is towards the center, so downwards,
so Apparent weight less than the original weight 20 N (2 kg).
You feel lighter at the top. Partial weightlessness.
On the bottom centripetal force is towards the center, so upwards,
Apparent weight more than the original weight 20 N (2 kg).
You feel heavier at the bottom.
Zero Gravity Plane to experience Weightlessness for few seconds,
when the plane is made to do free fall after a rise of 45 deg in a parabolic path.
A man is pulling a bucket of water, standing at the edge of a cliff.
Ground is supposed to be weak. Case 1 and Case 2 are shown.
Which case is safer and why?
In case 1, N = T + mg
In case 2, T + N = mg ==> N = mg-T (Tension T assumed to be vertically straight upwards even though it is shown to be in an angle)
Case 2 normal reaction is less than the case 1 normal reaction. Normal reaction is the force acting from the ground to man. So the force acting on the ground from man will also be lower (equal and opposite reaction) in case 2. So case 2 is safer as it may not collapse the ground under the feet.
Pulleys Simulation Lab
Fixed and Movable pulleys
Coin on a circular disk, objects on a planet. When will they fly apart?
Coin on a circular disk, objects on a planet. When will they fly apart?
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