# Gravitational force and normal force.

#### jimmyboykun

1. The problem statement, all variables and given/known data

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

2. Relevant equations

F=ma

3. 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?

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#### SteamKing

Staff Emeritus
Homework Helper
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.

#### jimmyboykun

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.

"Gravitational force and normal force."

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