Analysis Of Newton 's First Law Of Motion Essay

795 Words Oct 7th, 2015 4 Pages
1. C
Why: according to Newton’s first law of motion, an object that is free from all outside forces travels at a constant velocity, covering equal distances in equal times along a straight-line path, C is true.
2. D
Why: not matter an object is still or is in motion, the object has inertia all the time. Inertia is a nature/property of any objects.
3. D
Why: the ship is moving at a constant speed, which is in a balanced status. For the athlete, it would be likely to do a long jump on ground. Since he uses the same strength every time he tries, the distance should be equal.
4. A
Why: before he jumps, he moves as the car does (with a same velocity); after he jumps off and lands, he still has the same velocity with the car, therefore, he could easily fall toward the direction that the car moving to.
5. B
Why: inertia is the object’s resistance to changes in velocity and is related to the object’s mass. At first, those two balls are moving with car, so they has the same velocity. Since m1>m2, which means changing the velocity of the first ball is harder than the second’s does. After a while, the first ball will have a greater speed than the seconds, therefore, they will never meet each other.
6. D
Why: the person has the same velocity with the moving train, and because of the inertia, he fall back to the same location.
7. C
Why: net force is the sum of all the individual forces being exerted on an object. According to Newton’s Second Law, the direction of the acceleration is…

Related Documents