Homework Help: Physical Science

Posted by mysterychicken on Sunday, May 3, 2009 at 12:23pm.

Good afternoon. 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.

That's it for now but I will have some more later. Thanks again!
-MC

Physical Science - RickP, Sunday, May 3, 2009 at 4:12pm
Sound pretty good to me except for (3).

A lake would be larger (more volume and more mass) than a swimming pool, so the thermal energy of the lake - which is at the same temp as the pool - would be greater.
Physical Science - mysterychicken, Sunday, May 3, 2009 at 4:24pm
Thanks!!
-MC

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