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Force Force is what makes a massive thing accelerate. Force equals mass multiplied times acceleration, or F = m * a. There are four types of force, but we usually consider only two. These two are gravitational force and photo electromagnetic force. Although gravitational force is an extremely obvious force that affects just about everything, and although we have all become familiar with it since we were babies, it is not well understood, certainly not as well understood as photo electromagnetic force. Nevertheless, gravity is great fun to play with. Given two masses, one of 2kg and one of 1kg, the gravitational force on 2kg mass will be twice as much as the force on the 1kg mass, but the resistance to acceleration will be twice as much for the 2kg mass, therefore the acceleration due to the force of gravity will be the same for both of them. Since this relationship is found for any two masses whether they are the same or different, we say that the acceleration due to gravity is constant. The value of the acceleration due to gravity is approximately 9.8 m/s2 (approximately 10 m/s2.) Since force is mass multiplied times acceleration, then we can find the force due to gravity given a particular mass simply by multiplying times 9.8 m/s2. |