Lesson: Energy Conversion and Conservation
In this lesson, we will learn how to convert different types of mechanical energy to and from each other and to recognize when mechanical energy is dissipated.
Sample Question Videos
Worksheet: 9 Questions • 4 Videos
How much energy is dissipated during the sled’s downhill motion?
What average force of friction does the hillside apply to the sled during the sled’s motion? Answer to the nearest newton.
A car is initially at rest before it starts to roll along a downward-sloping road with its engine turned off. While rolling, the car’s velocity increased by 1.4 m/s. What vertically downward distance does the car travel? Gravity is the only force that acts on the car.
Which of the graphs (a), (b), (c), and (d) correctly shows the changes in kinetic energy (shown in red) and the gravitational potential energy (shown in blue) for a ball being thrown vertically upward and falling back to earth? The time axis of the graph starts at the instant the ball leaves the thrower’s hand, and the energy values cease to be plotted at the instant that the ball falls back to the height that it was released from. Air resistance is negligible.