DRIVER LICENSE CENTER CONTACT INFORMATION. PennDOT does not publish individual Driver License Center phone numbers. If you need assistance with a particular PennDOT Driver License Center, our Driver and Vehicle Services Customer Call Center staff will gladly assist you.Please call 1-800-932-4600 for assistance.RIVER LICENSE CENTER CONTACT INFORMATION. PennDOT does not publish individual Driver License Center phone numbers. If you need assistance with a particular PennDOT Driver License Center, our Driver and Vehicle Services Customer Call Center staff will gladly assist you.
Credit: koya979 Shutterstock. Gravity is the force that attracts two bodies toward each other, the force that causes apples to fall toward the ground and the planets to orbit the sun. The more massive an object is, the stronger its gravitational pull. Fundamental force. Gravity is one of the four fundamental forces, along with the electromagnetic, strong and weak forces. It is what causes objects to have weight. When you weigh yourself, the scale tells you how much gravity is acting on your body. The formula for determining weight is: weight equals mass times gravity. On Earth, gravity is a constant 9.8 meters per second squared, or 9.8 m/s 2.
Lesson Summary. The specific gravity of an object is the ratio between the density of an object to a reference object. Usually, our reference object is water, which has a density of 1 g/mL or 1 g/cm^3.