Gravitational force and normal force.

In summary, a 0.25kg book is being pushed down on a table with a force of 9.5 N. By using the equation F=ma, we can find that the total force exerted on the book is 11.95N. However, the normal force exerted by the table on the book is equal to the weight of the book, which can be seen through a free body diagram.
  • #1
jimmyboykun
39
0

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?
 
Physics news on Phys.org
  • #2
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
SteamKing said:
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.
 

1. What is gravitational force?

Gravitational force is a natural phenomenon that causes objects with mass to attract each other. It is the force responsible for the motion of planets, stars, and other celestial bodies in the universe.

2. How is gravitational force calculated?

Gravitational force is calculated using Newton's law of universal gravitation, which states that the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

3. What is the difference between gravitational force and normal force?

Gravitational force is the force of attraction between two objects with mass, while normal force is the force exerted by a surface on an object in contact with it. Gravitational force always acts towards the center of the Earth, while normal force acts perpendicular to the surface.

4. How does gravitational force affect objects on Earth?

Gravitational force is responsible for keeping objects on Earth and causing them to fall towards the ground when dropped. It also determines the weight of an object, which is the force with which it is pulled towards the center of the Earth.

5. Can gravitational force be manipulated?

Gravitational force cannot be manipulated, but its effects can be countered by other forces, such as the normal force, which prevents objects from falling through a surface. However, the strength of gravitational force can be altered by changing the mass or distance of objects.

Similar threads

  • Introductory Physics Homework Help
Replies
4
Views
594
  • Introductory Physics Homework Help
Replies
7
Views
243
  • Introductory Physics Homework Help
Replies
3
Views
766
  • Introductory Physics Homework Help
Replies
7
Views
1K
  • Introductory Physics Homework Help
3
Replies
95
Views
3K
  • Introductory Physics Homework Help
2
Replies
39
Views
2K
  • Introductory Physics Homework Help
Replies
5
Views
1K
  • Introductory Physics Homework Help
Replies
2
Views
631
  • Introductory Physics Homework Help
Replies
5
Views
1K
  • Introductory Physics Homework Help
Replies
2
Views
975
Back
Top