Question

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10. If you walk along the top of a fence, why does holding I1. The front wheels located far out in front of the racing your arms out help you to balance? vehicle help to keep the vehicle from nosing upward when it accelerates. What physics concepts plays a role here? When a car drives off a cliff, why does it rotate forward as it falls. (Consider the torque it experiences as it rolls off the cliff.) 12. 13. Why does a car nose up when accelerating, and nose down when braking? 14. Which will have the greater acceleration rolling down an incline-a bowling ball or a volleyball? Defend your answer 15. How would a ramp help you to distinguish between two identical looking spheres of the same weight-one solid and the other hollow? 16. Which will roll down an incline faster, a can of water or a can of ice? A friend says that a body cannot rotate when the net torque acting on it is zero. Your friend's assertion is in- correct. Correct it. 17. 18. Is the net torque changed when a partner on a seesaw stands or hangs from her end instead of sitting? (Does the weight or the lever arm change?)

Answer 1

when you walk on a fence then you spread your hands so that you can increase your moment of inertia and as total angular momentum is conserved so so if we moment of inertia then angular velocity is reduced and we can balance on the fence otherwise if angular velocity is more then there are chances of falling down

in a racing car the front wheel is kept at far from rear wheel so that it's center of mass lies attached to the ground and it experiences less torque while accelerating .

when car falls off from a cliff then it experience a torque due to it's weight about the edge of cliff and rotates while falling down

The braking forces create a rotating tendency, or torque, about the CG. Imagine pulling a table cloth out from under some glasses and candelabra. These objects would have a tendency to tip or rotate over, and the tendency is greater for taller objects and is greater the harder you pull on the cloth. The rotational tendency of a car under braking is due to identical physics. The braking torque acts in such a way as to put the car up on its nose .

for same angle of incline

for a bowling ball (solid sphere ) acceleration = 5/2 sin(theta)

for volley ball (shell) acceleration = 3/2 sin(theta)

so acceleration of bowling ball is more than a volley ball

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