A boy is pulling a girl in a child’s wagon at a constant speed. He begins...
A boy is pulling a girl in a child’s wagon at a constant speed. He begins to pull harder, which increases the speed of the wagon. Which of the following describes two ways you could calculate the change in energy of the wagon and girl if you had all the information you needed?
a
- Calculate work done from the force and the velocity.
- Calculate work done from the change in the potential energy of the system.
b
- Calculate work done from the force and the displacement.
- Calculate work done from the change in the potential energy of the system.
c
- Calculate work done from the force and the velocity.
- Calculate work done from the change in the kinetic energy of the system.
d
- Calculate work done from the force and the displacement.
- Calculate work done from the change in the kinetic energy of the system.
Homework Answers
Option d) is correct
change in energy is calculated by following two ways.
Work done = Force x displacement
from the work energy theorem
Work done is change kinetic energy.
.
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