1. Which is the best description of potential energy? (1 point)
2. Nan’s suitcase has a mass of 14 kilograms. How much potential energy does it gain when she lifts it onto a bench that is 40 centimeters tall? PE=mgh
3. A baseball is sitting on a raised bench. A player accidentally knocks the baseball off the bench. Which statement best describes what will happen to baseball’s energy during its fall?
4. Nan’s suitcase is on a bench. The suitcase has a mass of 14 kilograms. Nan accidentally knocks the suitcase off the bench, and the suitcase falls at a speed of 2.7 meters per second. How much kinetic energy does the suitcase have just before it hits the floor? KE=1/2mv^2
5. Which factors does an object’s potential energy depend on?
1. Potential energy is the energy that an object possesses due to its position or condition.
2. To calculate the potential energy, we need to know the mass (m), the acceleration due to gravity (g), and the height (h). In this case, the height is given as 40 centimeters. To calculate the potential energy, we multiply the mass (14 kg) by the acceleration due to gravity (9.8 m/s^2) and the height (0.4 m): PE = 14 kg * 9.8 m/s^2 * 0.4 m = 54.88 Joules (rounded to two decimal places).
3. As the baseball falls, it will lose potential energy due to the decrease in height. This potential energy is converted into kinetic energy, which increases as the baseball gains speed during the fall.
4. To calculate the kinetic energy, we need to know the mass (m) and the velocity (v). In this case, the mass is given as 14 kilograms and the velocity is given as 2.7 meters per second. To calculate the kinetic energy, we use the formula KE = 1/2 * 14 kg * (2.7 m/s)^2 = 64.71 Joules (rounded to two decimal places).
5. An object's potential energy depends on its mass, the acceleration due to gravity, and its height.