Can someone please check if my answers for these questions are correct? Thanks!
1.Explain in terms of force and distance how using a ramp to load boxes into a truck makes work easier.
(Ans-) Less force is applied but the distance is longer.
2.A ball sitting on the top of a table has potential energy but no kinetic energy. Describe how potential and kinetic energy can change as the ball falls off the table to the floor.
(Ans-) When the ball falls, the kinetic energy increases and potential energy decreases..
3.Explain how the thermal energy of a swimming pool compares to the thermal energy of a lake at the same temperature.
(Ans-) The swimming pool is larger than the lake so it has more particles.
Thanks again,
-MC
1 and 2 look ok to me.
What you say about #3 is true; however, I don't think you have answered the question.
Rick P told me how to answer it the right way in my previous post...thanks a lot!
-MC
1. Your answer is partially correct. Using a ramp does indeed make work easier, but let's explain it in terms of force and distance. When you use a ramp to load boxes into a truck, you essentially increase the distance over which the force is applied. The force required to lift the box vertically into the truck would be greater compared to pushing the box up the ramp using a smaller force over a longer distance. The amount of work done is the force applied multiplied by the distance moved, so by increasing the distance and decreasing the force, you are reducing the amount of work required.
2. Your answer is correct. Potential energy refers to the energy an object possesses due to its position or height, while kinetic energy is the energy an object possesses due to its motion. When the ball is sitting on the table, it has potential energy because of its elevated position. As the ball falls off the table, its potential energy decreases while its kinetic energy increases because it gains motion while losing height.
3. Your answer is incorrect. The size or volume of the swimming pool or lake does not determine the thermal energy. The thermal energy of a substance is related to its temperature and the number of particles present. If the swimming pool and the lake are at the same temperature, then their thermal energy should be roughly the same. The thermal energy is determined by the average kinetic energy of the particles within the system, which is proportional to the temperature.