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Writer's picturekeshprad

PhysicsBowl 2017 Q15


15) Question 15 wants us to find the force the block Y exerts on block X. Since the blocks stick together, we know that they will accelerate at the same rates. We can first consider the system as a whole.

Where N is normal force, m is mass, and g is acceleration due to gravity

We can see that the net force of the system, is just the applied 35-Newton force. By using Newtown's second law for the system as a whole, we can find the net acceleration.

Where F is force, m is mass, and a is acceleration

If we take a look at the net forces on block X, we can find the force the block Y exerts on block X.

Where m is mass, a is acceleration, F is force, g is acceleration due to gravity and N is normal force

Answer: C

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