For each of the statements regarding the leading statement, circle whether the s
ID: 1440400 • Letter: F
Question
For each of the statements regarding the leading statement, circle whether the statement is true or false. (There may be any number of true (or false) responses for each leading statement.
1. A block slides up a rough inclined plane.
T or F The work done by the force of gravity is negative.
T or F The gravitational potential energy of the block decreases.
T or F Mechanical energy is not conserved.
2. Two objects with different masses travel towards each other on a horizontal, frictionless surface with equal speeds. They collide and stick together. All forces other than the forces of collision can be neglected.
T or F Momentum is conserved.
T or F Kinetic energy is conserved. T or F The final speed of each object is zero.
T or F The final total kinetic energy is zero.
Explanation / Answer
(1) if body slides up a rough inclined plance
true the work done by force of gravity is negative because the acceleration due to gravity is nagative
TRUE the gravitational potential energy of block is decreases same region
FLASE the mechanical energy is not conserved
(2) the collision is head on elsatic collision
in this collision momentum and kinetic energy is conserved
TRUE the momentum is conserved
TRUE kinetic energy is conserved
FALSE the final speeds is not zero basing on law of conservation of momentum
true the final kinetic energy is zero
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