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When is Work Being Done on an Object?
Which of the following is NOT an example of work being done on an object?
A. Pushing a child on a swing.
B. Earth rotating around the sun on its axis.
C. Hitting a softball over the fence.
D. Filing paperwork away in a filing cabinet.
Hey there, physics enthusiast! Let's get down to business. Work is done on an object when a force is applied to it, causing a displacement in the direction of the force. Simple enough, right?
- Pushing a child on a swing (A) - Yep, work is being done here! You're applying a force to the swing, and it's moving in the direction of that force.
- Earth rotating around the sun on its axis (B) - Nope, no work is being done here. The Earth is moving due to its angular momentum, not because of an external force.
- Hitting a softball over the fence (C) - You bet your sweet bippy work is being done here! You're applying a force to the ball with your bat, and it's flying off in the direction of that force.
- Filing paperwork away in a filing cabinet (D) - Ah, finally, an example of no work being done! You're not applying a force to the papers, you're just rearranging them. No displacement, no work done.
So, the correct answer is D. Filing paperwork away in a filing cabinet. Now, go forth and spread the joy of physics!
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