In which of these cases is a youngster doing work in the school gymnasium?
1. climbing up a rope
2. hanging motionless from a chinning bar.
3. lifting a set of weights from the floor to overhead
WHICH ONE & WHY? A BRIEF EXPLANATION WOULD BE NICE. thank you all =]
I will be happy to critique your thinking. Hint: Number two involves no work.
In which of these cases is a youngster doing work in the school gymnasium?
climbing up a rope
lifting a set of weights from the floor to overhead
WHICH ONE & WHY? CANT FiND THE ANSWER ANYWHERE.. NEED HElP FOR A TEST.. PlEASE EXPlAiN? TEST iS TOMORROW!
The correct answer is "lifting a set of weights from the floor to overhead." Here's the explanation:
To determine which activity involves work, we need to understand the scientific definition of work. In physics, work is defined as the product of the force applied to an object and the distance the object is moved in the direction of that force.
In the first activity, climbing up a rope, the youngster does not move vertically because they stay in the same position. Therefore, no work is done in this case.
In the second activity, hanging motionless from a chinning bar, the youngster is also not moving. Since there is no displacement, no work is done in this case either.
In the third activity, lifting a set of weights from the floor to overhead, the youngster applies a force to lift the weights against the force of gravity. They also move the weights vertically a certain distance. As a result, work is done in this case because both force and displacement are present.
Therefore, the activity of lifting a set of weights from the floor to overhead involves work in the school gymnasium.
Remember, when determining if work is done, you need to consider both force and displacement. I hope this explanation helps you with your test. Good luck!