\"address all questions using energy and/or mometum. Not F=ma Suppose you had a

Question

"address all questions using energy and/or mometum. Not F=ma
Suppose you had a block of ordinary ice on a frozen lake, free from all friction. Now, suppose some continuous, constant force acts on the block in a horizontal direction. For sure, this causes the block to accelerate. After some time, the force is stopped so the spped of the block will have increased a certain amount.
1. Let the force and mass of the block be unchanged, but the time for the force to act to be doubled. Then the increase in speed of the block will be:
a. unchanged b. doubled c. tripled d. cut in half e. four-fold
explain

Now suppose the original force and action time are unchanged, but the mass is doubled. then the speed increase will be
a. unchanged b. doubled c. tripled d. cut in half e. four-fold
explain

If the mass and action time is unchanged, but the force is doubled, then the change in speed wil be:
a. unchanged b. doubled c. tripled d. cut in half e. fourfold
explain

Now the action time the force and the mass are all the same as orginallu but somehow the force of gravity is doubled. then the increase in speed would be
a. unchanged b.doubled c. tripled d. cut in half e. four fold
explain

Explanation / Answer

1. Let the force and mass of the block be unchanged, but the time for the force to act to be doubled. Then the increase in speed of the block will be: b. doubled explain because the time the force acts is doubled so the block momentum is doubled. M=mv so velocity is doubled. Now suppose the original force and action time are unchanged, but the mass is doubled. then the speed increase will be cut in half e explain similar to above. M=mv=F*t. mass is doubled while M is unchanged so v must be cut in half If the mass and action time is unchanged, but the force is doubled, then the change in speed wil be: b. doubled explain M=F*t=mv. F is doubled so M is doubled so to v Now the action time the force and the mass are all the same as orginallu but somehow the force of gravity is doubled. then the increase in speed would be a. unchanged explain the force of gravity have no relation to horizontal movement of the block

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