Q:
# What is frictional force?

A:
### Quick Answer

**Frictional force is the force created by two surfaces contacting and sliding against each other.** There several different forms of frictional forces, such as dry friction and fluid friction.

Credit:
Nicholas Rigg
Stone
Getty Images

Frictional forces are affected by the texture of the surfaces and the amount of force pushing them together. The angle and position of the objects affects the amount of frictional force. If an object is sitting flat against an object, then the frictional force is equal to the object's weight. If the object is pushed against the surface, the frictional force is increased and becomes greater than the object's weight. Objects pulled away from the surface and those at an incline with the surface have less frictional resistance.

Learn More-
Q:
## Why do some shapes tessellate and others not?

A:Tessellations occur when a shape is repeated in an interlocking pattern that fully covers a flat surface, or plane, like the pieces of a puzzle. Some shapes cannot tessellate because they are not regular polygons or do not contain vertices (corner points). They therefore cannot be arranged on a plane without overlapping or leaving some space uncovered. Due to its rounded edges and lack of vertices, the circle is normally not tessellated.

Full Answer >Filed Under: -
Q:
## Can a triangle have two acute angles?

A:

Full Answer >**A triangle can have two acute angles.**Some examples of triangle types that have two acute angles are a right triangle and an isosceles right triangle.Filed Under: -
Q:
## How many vertices does a square have?

A:

Full Answer >**A square is a polygon with four vertices.**The shape has four equal sides and four 90-degree angles; thus, it is called a regular quadrilateral. The sides meet in four corners, which are called vertices.Filed Under: -
Q:
## What were the contributions of Rene Descartes?

A:

Full Answer >**Rene Descartes, widely regarded as the father of modern philosophy, broke with the Aristotelian tradition, helping establish modern rationalism.**He argued for a mechanistic universe in opposition to Aristotle's views on causality. He also made important contributions to mathematics and physics.Filed Under: