Advertisements
Advertisements
प्रश्न
Explain why, a runner presses the ground with his feet before he starts his run.
Advertisements
उत्तर
A runner presses the ground with his feet before he starts his run to receive a large reaction force by the ground on which he exerts an action force, in the forward direction. In this way, he can gain a great speed.
APPEARS IN
संबंधित प्रश्न
Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.
A girl weighing 25 kg stands on the tloor. She exerts a downward force of 250 N on the floor. What force does the floor exert on her ?
If action is always equal to reaction, explain why a cart pulled by a horse can be moved.
Why is it difficult to walk on a slippery road ?
Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
Give a scientific reason.
Even though the magnitudes of action force and reaction forces are equal and their directions are opposite, their effects do not get cancelled.
While catching a cricket ball the fielder lowers his hands backwards. Why?
“Wearing helmet and fastening the seat belt is highly recommended for safe journey” Justify your answer using Newton’s laws of motion.
Why do the action and reaction forces in a pair not cancel each other out?
A book is resting on a table. Which of the following is the correct reaction force to the gravitational pull of the Earth on the book?
