The metal head of a hammer is loose. To tighten it, you drop the hammer down onto a table. Should you (a) drop the hammer with the handle end down, (b) drop the hammer with the head end down, or with the head end down, or (c) do you get the same result either way?

 

C O N C E P T U A L  C H E C K  P O I N T

T I G H T E N I N G     A      H A M M E R

The metal head of a hammer is loose. To tighten it, you drop the hammer down onto a table. Should you (a) drop the hammer with the handle end down, (b) drop the hammer with the head end down, or with the head end down, or (c) do you get the same result either way?

R E A S O N I N G   A N D    D I S C U S S I O N

It might seem that since the same hammer hits against the same table in either case, there shouldn’t be a difference. Actually, there is.

In case (a) the handle of the hammer comes to rest when it hits the table, but the head continues downward until a force acts on it to bring it to rest. 

The force that acts on it is supplied by the handle, which results in the head being wedged more tightly onto the handle. Since the metal head is heavy, the force wedging it onto the handle is great.

 In case (b) the head of the hammer comes to rest, but the handle continues to move until a force brings it to rest. The handle is lighter than the head, however; thus the force acting on it is less, resulting in less tightening.

A N S W E R

(a) Drop the hammer with the handle end down.

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