Basic physics

• $√2$is 1.4
• $√3$is 1.7
• 15 squared is 225
• 14 squared is 196
• 13 squared is 169
• 12 squared is 144
• 11 squared is 121
• slope of graph: y2 - y1 / x2 - x1
• Scalar is just a number like mass or time
• Vector is a number with direction, such as momentum, velocity, force
• Vector must have a straight direction
• Sin of 0 degree angle equals 0
• Sin of 30 degree angle equals square root of 1/2 or 0.5
• Sin of 45 degree angle equals square root of 2/2 or 0.7
• Sin of 60 degree angle equals squire root of 3/2 or 0.9
• Sin of 90 degree angle equals square root of 4/2 or 1
• Sin of 180 degree angle equals 0
• Cos of 0 degree angle equals square root of 4/2 or 1
• Cos of 30 degree angle equals square root of 3/2 or 0.9
• Cos of 45 degree angle equals square root of 2/2 or 0.7
• Cos of 60 degree angle equals square root of 1/2 or 0.5
• Cos of 90 degree angle equals 0
• Cos of 180 degree angle equals -1
• Pythagorean theorem: a2 + b2 = c2, where c is the hypothenuse
• 3-4-5 triangle is a triangle in which two sides re equal 3 and 4, and then hypothenuse will be 5
• Vector components can be calculated as Vx = V x cos (because horizontal plane is cozy) and Vy = V x sin (in vertical plane you spine rest)
• Cube volume = x3
• Rectangular prism's volume = xyz
• Volume of cylinder = pi x r2 x h
• Sphere's volume is 4/3 x pi x r3
• Perimeter of rectangle is 2 x (x + y)
• Circumference of circle is 2 x pi x r
• Area of square is x2
• Density of water is 1000 kg/m3
• Specific gravity = density of object / density of solution
• If specific gravity is > 1, then object will fully sink in a solution
• Density = mass / volume, and in physic it is measured as kg / m3
• Distance is a scalar quality, but displacement is vector quality
• Speed is scalar quantity, and velocity is vector quantity
• Vectors have magnitude, size and direction