A truck that is stopped on the road has to be pushed hard to get into motion when the truck bis moving a little it can be moved fast with a less push Why?
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- for starting the motion the ground reacts the resistant with static friction ...
- static friction always acts when there is tendency of motion....
- as the external force increase ....one time will come when static friction is not enough and objects starts to move
- after motion kinetic friction acts on the object which is always be less than the static friction because static friction is the limiting and maximum friction of any object
- so after motion we have to endure less resistant than starting...so its easy to move after the motion.
hope it helps..
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