Chapter 6- Force and Motion II

Static friction

A type of frictional force that keeps an object at rest.

radial axis

Therefore, the force and acceleration vectors are sometimes drawn along a(n) ________ r that moves with the body and always extends from the center of the circle to the body, even though the positive direction of the acceleration is radially outward.

Drag force

A force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.

Air density

The mass per unit volume of Earth's atmosphere.

value of C

If the value of v varies significantly, the ________ may also vary, but generally, it is thought to be a constant.

Fluid

Anything that can flow, which is usually liquid or gas.

Circular arc

The arc of a circle between a pair of distinct points.

Kinetic frictional force

Friction as it occurs between two surfaces that are rubbing through each other.

Centripetal force

The inward force on a body moving in a curved path around another body.

Effective cross- sectional area

The area of a two-dimensional shape that is obtained when a three-dimensional object is sliced perpendicular to some specified axis at a point.

drag force

The ________ gradually increases from 0 as the speed of the body increases.

Three main types of forces will be explained in detail here

frictional force, drag force, and centripetal force

This brings us to the next type of frictional force

the kinetic frictional force

Cold-welding

The process of joining (a piece of metal) to another without the use of heat, by forcing them together so hard that adhesion occurs.

Lubrication

the condition of having been made smooth or slippery by the application of a lubricant.

Terminal Velocity

The state of a body moving at a constant speed when all the forces acting on it are balanced out.

Circular Motion

A movement of an object along the circumference of a circle or rotation along a circular path.