When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20◦ below the horizontal, the magnitude of the normal force of the floor on the crate is: Choices: 180N 68N 25N 310N 250N

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Q: When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed…

A: Solution:

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!