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Introduction to Forces9/25/2019 Forces push and pull, trying to affect motion. They can be either from a physical source – the force applied by pushing something would be an example of this – or from a field – Earth's gravity would be an example of this. Forces are measured in newtons, or N. Mass is the unit of measurement for inertia. In other words, mass is a measure to an objects resistance to acceleration when a net force is applied. Its unit is kilograms, and should not be confused with weight, which measures the forces acting on an object – the most common example being the force of gravity on an object giving us its weight. Mass is closely related to inertia, because inertia is calculated using both the mass of an object and the speed. A vector is an object that has both direction and magnitude, like force or velocity. The opposite of a vector is a scalar, which has only magnitude. An example of a scalar would be speed or distance.
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