Question
understand: changes in energy
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Isabella is riding a skateboard. She pushes the back of the skateboard down
dragging it on the ground. The dragging skateboard acts as a brake and
applies a friction force in the opposite direction of her motion.
How does Isabella's kinetic energy change?
Choose I answer
The friction force increases Isabella's kinetic energy.
The friction force decreases Isabella's kinetic energy.
it does not change because energy is conserved.
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Answer
The friction force applied by the dragging skateboard opposes the motion of Isabella. Therefore, it does work against her motion, which results in a decrease in her kinetic energy. So, the correct answer is "The friction force decreases Isabella's kinetic energy."