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How to Calculate Net Force What is a force? • Force is a push or pull in a particular direction. Forces can affect motion in several ways: • They can: • make objects start moving • Change direction FORCE FACTS: • Measured in Newton's (N) • Forces usually act in pairs • Forces act in a particular direction • Usually cannot be seen How to Calculate Net Forces • When two forces act in the same direction on an object, the net force is equal to the sum of the two forces 8N 6N 14N How to Calculate Net Forces Continued • When two unequal forces act in opposite directions on an object, the net force is the difference of the two forces 18N 50N 32N Force, Mass, Acceleration • Force = Mass x Acceleration F= ma How much force is required to accelerate a 50 kg mass at 4 m/s2? F= ? F= M= 50 kg A= 4 m/s/s F= 200 N 50 kg * 4 m/s/s What is the acceleration of a 7 kg mass being pulled by a 56 N force? F= 56N F=ma 56N = 7 kg * M= 7 kg A= ? 8 m/s/s A What is the mass of a block accelerating at 2 m/s2 and pushed by a 9 N force? F= 9N M= ? F=ma 9N A = 2 m/s/s 4.5 kg = M * 2 m/s/s