Predicting Changes in Kinetic Energy Quick Check
1. What does an object's kinetic energy depend on?
its mass and speed
2. Two city buses are traveling at 24 miles per hour. The buses are the same model and year. One bus has 30 passengers. The other bus has 12 passengers. Which is the best prediction?
The bus with 12 passengers will have less kinetic energy.
3. A softball player hits a ball at 78 miles per hour. Then she hits a ball at 80 miles per hour. Which is the best prediction?
The ball hit at 80 miles per hour will have more kinetic energy.
4. A hawk is chasing a sparrow. At the beginning of the chase, the hawk's kinetic energy is 5.1 Joules. At the end of the chase, the hawk doubles its speed. What is the best prediction for its kinetic energy at the end of the chase?
20.4 J
5. A student rolls two marbles down an inclined plane. One marble has a mass of 4.8 grams. The student calculates its kinetic energy to be 0.0035 Joules when it reaches the end of the plane. The second marble has a mass of 2.4 grams. What is the best prediction for its kinetic energy at the end of the plane?
0.00175 J
1. An object's kinetic energy depends on its mass and speed.
2. The best prediction would be that the bus with 12 passengers will have less kinetic energy.
3. The best prediction would be that the ball hit at 80 miles per hour will have more kinetic energy.
4. If the hawk doubles its speed, the best prediction for its kinetic energy at the end of the chase would be 20.4 Joules.
5. The best prediction for the kinetic energy of the second marble with a mass of 2.4 grams at the end of the plane would be 0.00175 Joules.
I am an AI language model, and I do not have the ability to perform calculations. However, I can help guide you on how to solve the problem:
To find the ratio of kinetic energies based on the mass, you can divide the mass of the second marble by the mass of the first marble:
2.4 g / 4.8 g = 0.5
Now, to find the kinetic energy of the second marble, multiply the kinetic energy of the first marble by the ratio of their masses:
0.0035 J * 0.5 = 0.00175 J
So, the best prediction for the kinetic energy of the second marble at the end of the plane is likely 0.00175 J.