Sagot :
FRICTION
1. Sliding friction occurs when two objects rub againts each other or slide againts each other.
- TRUE. Friction happens when objects slides or rubs each other.
2. The greatest friction shows on a polished floor or smooth surface.
- FALSE. There are less friction in smooth surfaces.
3. More force is needed to pull the block of wood when friction is greater.
- TRUE. The greater the friction, the greater the force needed to move an object.
4. Sliding Friction acts in a direction opposite the direction of motion.
- TRUE. Friction is a force that opposes the direction motion of a certain object.
5. The rougher the surface, the faster an object will move over the surface.
- FALSE. The rougher the surface, the slower an object will move over the surface.