Defining Pencil
PHYSICS: Can you pull up a pencil?
My study guide is asking, in regards to thinking about defining the system, "can you pull up a pencil?"
I would, with my ignorant thinking, say yes, but then again wouldn't the pencil be in theory pulling me down with equal amount of force due to F1= -F2? Any help would be appreciated =).
Technically, you push it up, but yes, you can def lift a pencil! Yes, the pencil exerts equal force on your fingers, but that doesn't keep it from rising. That just means, as you lift it, you feel the weight on your hand. The reason your pencil accelerates up but your hand doesn’t down is the difference in mass. force/mass=acceleration. You’re connecting touch with equal and opposite reaction, but you shouldn't. For instance, a space ship works by tossing fast particles out of its lifters. It works even without air. As it tosses the particles back, they toss the ship forward with equal force.
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