Claire is skating across a frozen pond.Which of these would cause Claire's energy of motion to increase? A. changing her direction B. decreasing her speed C. removing her skates D. increasing her speed
Question
Claire is skating across a frozen pond.Which of these would cause Claire's energy of motion to increase? A. changing her direction B. decreasing her speed C. removing her skates D. increasing her speed
Solution
The energy of motion, also known as kinetic energy, is determined by both the mass of an object and its speed. In this case, Claire's mass is not changing, so we need to look at the factors that could affect her speed.
A. Changing her direction: This would not necessarily increase Claire's energy of motion. While it might require some energy to change direction, it doesn't inherently increase her speed.
B. Decreasing her speed: This would actually decrease Claire's energy of motion, not increase it. The slower she goes, the less kinetic energy she has.
C. Removing her skates: This would likely make it harder for Claire to move at all, let alone increase her speed. Skates reduce friction and allow for faster movement on ice.
D. Increasing her speed: This would indeed increase Claire's energy of motion. The faster she goes, the more kinetic energy she has.
So, the answer is D. Increasing her speed would cause Claire's energy of motion to increase.
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