10-N directed towards your finger.
Friction.
Friction is a phenomenon which acts to resist an applied force, both 'pushing' and 'pulling'. It is a force in itself, and may be considered the opposite of slippery. It will change the path of a body in motion.
No
Friction.
The book slides with constant velocity.
It depends. Two surfaces which are pressed together will show a frictional force resisting any sliding. If they are pressed together by gravity (e.g. such as for a book lying on a table), then the frictional force resisting a horizontal push will depend on the weight of the book, which depends on the force of gravity.
When you push a book, it stops because of the force you are applying to it. The friction between the book and the surface it is resting on counteracts the force you are applying, bringing the book to a stop.
Friction.
Friction is a phenomenon which acts to resist an applied force, both 'pushing' and 'pulling'. It is a force in itself, and may be considered the opposite of slippery. It will change the path of a body in motion.
No
Yes, Sliding friction opposes the movement of the book, slowing it down.
Friction.
The book slides with constant velocity.
YES, YEA it is Yes it is a force. If not then we would be slipping around. What i have heard is that friction causes a pull in some ways. Say you slid a pencil on the floor with nothing in it's path. Now if you know what inetia (not a force) then you would know that the pencil would stop because of a outside force. And that force is friction. Friction had reduced the pencils speed when it rubbed together on the floor. Now if the pencil was givin more force when you pushed it and the floor was more slik then the pencil would have traveled alot more. This is because the force of friction is a less amount when one surface is smoother. I know this is a horrible explanation but this is what helps me think of the forces. And this is going to prove to my teacher that friction is a force and that inertia is not.
friction is a contact force
In fact, there is an infinite number of answers because force is a vector, meaning that it has a magnitude and an orientation. For example, if someone pushes horizontaly onto the book (10N) and the friction is 8N in the opposite direction, the resultant force is 2N. But if the book is pushed at an angle, the resultant force changes.
39.2 N