TRUE OR FALSE 1) Kinetic energy is proportional to speed. 2) The work required t
ID: 1499983 • Letter: T
Question
TRUE OR FALSE
1) Kinetic energy is proportional to speed.
2) The work required to stretch a spring changes linearly with the amount of stretch.
3)A force can be exerted on an object and yet do no work.
4) If a force is directed perpendicular to the displacement, no work is done by that force.
5) Work is a vector quantity.
6) In an inelastic collision, the initial kinetic energy is less than the final kinetic energy.
7) In a one-dimensional elastic collision of two identical masses, the masses always exchange velocities
8) The impulse delivered to an object is equal to the change in the object's velocity.
9) In any elastic head-on collision, the relative speed of the two objects after the collision has the same magnitude (but opposite direction) as before the collision, no matter what the masses are.
Explanation / Answer
1) F
Kinetic energy is proportional to square of speed. k.e.= (1/2) mv^2
2) F
The work required to stretch a spring changes linearly with the square of amount of stretch.
W =F. x = kx.x
3) T
if there is no displacement, there is no work
4)T
If a force is directed perpendicular to the displacement, no work is done by that force.
the dot product of force and displacement is zero
5) F
work is the dot product of force and displacement. so scalar
6)F
In an inelastic collision, the initial kinetic energy is grater than the final kinetic energy. energy loss happens.
7)T
In a one-dimensional elastic collision of two identical masses, the masses always exchange velocities to conserve kinetic energy and momentum simultaneously
8) F
The impulse delivered to an object is equal to the change in the object's momentum.
9)T
In any elastic head-on collision, the relative speed of the two objects after the collision has the same magnitude (but opposite direction) as before the collision, no matter what the masses are.
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