An object in motion remains motion. An object at rest remains at rest. 1. What i

Question

An object in motion remains motion. An object at rest remains at rest. 1. What is the physical difference between the above two statements, if any? 2. How long would it take a car at 25 m/s to come to a stop without friction, obstacles, or breaks? Every action has an equal negative reaction. 3. A 65kg student stands on the floor. How much force does the floor exert on her? In what direction? (Note: ~9.8m/s^2, so she weighs ~ 637 Newtons) 4. If you yell at a brick wall it won't yell back. If you hit a brick wall, will it hit you back? (Think about it. Will it hurt?) 5. A flare pistol can be made to fire a 12-guage slug. Besides legal problems, why is this a bad idea?

Explanation / Answer

1).an object in motion can not come to rest until an external force is applied on it and an object in rest can not come in motion until an external force is applied on it

2).if there is no friction or any obstacle to bring the car to rest ...it will never come to rest

3).force exerted by student on floor=mg=65*9.8=637 N downwards

thus by newtons third law force exerted on student by floor is 637 N but in upwards direction

4).the pain you will have in your hand because of the opposite force exerted by the wall on your hand ....thus in a way you can say that wall did hit you :P

5).the flare pistol would not be able to handle the reaction force by 12 gauge slug ......you may hurt your hand while doing so

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