eli5 How can humans push cars and pull massive things with weeks but can’t lift more than a few hundred pounds?

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*weels not weeks

In: Physics

5 Answers

Anonymous 0 Comments

The force you are fighting against when pushing/pulling is friction. This isn’t as much force as the direct downward force of gravity when you try to lift something.

Additionally, you can use your weight to push and pull (e.g., leaning into the direction you’re pushing). When lifting, you are relying entirely on your muscle capacity. And lastly, lifting an object really depends also on its geometry. Awkwardly sized objects are hard to lift. When pushing, it’s not as big a deal because you are not personally trying to stabilize the object (which means actively fighting the force from torque). Ideally, an object is already stable on the ground.

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