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1) A person pushed a crate across a rough floor at a constant speed witha a force of 200 pounds. The force of friction on the crate is?
Not enough information to say.
100 pounds
300 pounds
200 pounds
2) The U. S. army needed a weapon to stop surprise attacks by lurking enemies. They developed the 45 calibre semi-automatic pistol which fires a large slug. They needed the large slug because it has a lot of
Potential
Rotation
Length
Mass
a.Not enough information to say.
b.100 pounds
c.300 pounds
d.200 pounds
Explanation / Answer
1)
here,
as the velocity of crate is constant
the accelration of the crate is zero
therefore , by seccond law of newton
the net force on the crate is zero
the friction force - force applied = 0
the friction force = 200 pounds
the force of friction on the crate is 200 pounds
2)
as for contering the rebound of gun ,
they need a large mass , hence , they need a large slug beacuse it has a lot of
D) mass
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