Multiple Choice
Given the equation mgh = (1/2)mv^2, what is the expression for height (h) in terms of velocity (v) and gravitational acceleration (g)?
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9. Work & Energy
Intro to Energy & Kinetic Energy
Multiple Choice
Which of the following is an example of ?
A
A stretched bow ready to shoot an arrow
B
A moving car traveling down the highway
C
A rock resting at the top of a hill
D
A battery storing electrical energy
Verified step by step guidance1
Step 1: Understand the definition of kinetic energy. Kinetic energy is the energy an object possesses due to its motion. It depends on the mass and velocity of the object.
Step 2: Recall the formula for kinetic energy: \(\text{KE} = \frac{1}{2} m v^{2}\), where \(m\) is the mass and \(v\) is the velocity of the object.
Step 3: Analyze each option to determine if the object is in motion. For example, a stretched bow has potential energy stored, not kinetic energy, because it is not moving.
Step 4: Identify that a moving car traveling down the highway has kinetic energy because it is in motion with a certain velocity.
Step 5: Conclude that objects at rest, like a rock on a hill or a battery storing energy, do not have kinetic energy but may have potential or stored energy instead.
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