18. A father and son pushed their car to bring it to the side of road as it had stalled in the middle of the road.
They experienced that although they had to push with all their might initially to move the car, the push
required to keep the car rolling was smaller, once the car started rolling. Explain.
Answers
Answer:
Laws of friction at work here!!!...when we push something against friction then we have to apply force so as to just move the thing..when we apply force static friction comes into play ...it does not allow the object to move..when we increase force value of static friction also inc....but at one point when we keep increasing the force the static friction cannot increase any more...at this moment the object is about to move...when we apply more force the object stars moving and then friction decreases a little bit as the motion starts and then finally it becomes constant and then we can apply a constant force to move the object (i.e we don't need to keep increasing our force) ....this to overcome static friction we need to apply a larger force to move an object
Explanation:
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Answer:
See... The Highest friction caused is the Static Friction and the least is in the Rolling Friction. Since, Rolling Friction has the least amount of Friction, it states that not much force needs to be applied as very less amount of friction will oppose the motion of car. Therefore, it will keep rolling. For better understanding, let us take an example of Skates... When you apply force, the wheels start to roll and now you can just stand by bending a bit without moving your legs, you will see that the skates will role themselves automatically to a greater extent... Same is in the case of the situation that you described...This is the simple law of Force...
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