More 1D Equilibrium Video Lessons

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Problem: Which of these objects is in equilibrium?A. A car driving down the road at a constant speed.B. All of the listed answers are correct.C. A block sitting at rest on a table.D. A skydiver falling at a constant speed.

FREE Expert Solution

An object is considered to be in equilibrium if the net force acting on it is zero.

That is, at equilibrium:

ΣF = 0. 

We also need to use Newton's second law:

ΣF=ma, where m is mass and a is the acceleration.

A.

When a car drives down the road at a constant speed, the acceleration is zero. 

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Problem Details

Which of these objects is in equilibrium?

A. A car driving down the road at a constant speed.

B. All of the listed answers are correct.

C. A block sitting at rest on a table.

D. A skydiver falling at a constant speed.

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