Gravitational force and normal force.

  • #1

Homework Statement



1) A 0.25kg book rest on a table. A downward force of 9.5 N is exerted on the top of the book by a hand pushing down on the book.

2)what is the size of the normal force exerted by the table on the book

Homework Equations



F=ma

The Attempt at a Solution



1) what I did 0.25kg*9.81m/s^2= 2.4525N and I then 2.4525N+9.5N= 11.95N

2) wouldn't the normal force be equal to the weight(gravity) so wouldn't the answer be 11.95N or could I subtract 11.95 from 9.5N?
 

Answers and Replies

  • #2
SteamKing
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If you draw a free body diagram of the book and the force from the hand pressing down, the magnitude of the normal force keeping the book in equilibrium will become crystal clear.
 
  • #3
If you draw a free body diagram of the book and the force from the hand pressing down, the magnitude of the normal force keeping the book in equilibrium will become crystal clear.

ok I didn't taught about the free body diagram thanks.
 

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