| A | B |
|---|
| the force that opposes (goes against) the sliding motion of two surfaces that are touching each other | FRICTION |
| Amount of friction depends on two things: | 1) KINDS of SURFACES, and 2) FORCES PRESSING THE SURFACES TOGETHER |
| frictional force that PREVENTS two surfaces from sliding past each other | STATIC FRICTION |
| the force that OPPOSES (goes against) the motion of two surfaces sliding past each other | SLIDING FRICTION |
| frictional force between a rolling object and the surface it rolls on | ROLLING FRICTION |
| friction-like force that opposes the motion of objects that move through the air | AIR RESISTANCE |
| when upward air resistance balances out the downward force of gravity and the net force =zero | TERMINAL VELOCITY |
| Air resistance is in the opposite direction and depends on..... | SIZE and SHAPE of the object. |
| Air resistance causes objects to fall with.... | ....DIFFERENT ACCELERATIONS AND SPEEDS. |
| Feathers and leaves fall more slowly than pennies and apples.... | ........BECAUSE OF AIR RESISTANCE |
| You push a box and it doesn't move. Force of friction is greater than your push. | EXAMPLE OF STATIC FRICTION |
| You and a friend move a box. YOu break the microwelds and box moves. It you stop pushing, box stops. | EXAMPLE OF SLIDING FRICTION |
| Caused when wheel and surface are deformed as wheel rolls over it producing a frictional force while in contact.....t | .....EXAMPLE OF ROLLING FRICTION |
