Forces - A push or pull that acts between two objects., Forces always act in __________ - pairs, Newton - The unit that forces are measured in, 100 grams - 1 Newton, 1 400 grams - 14 Newtons, 250 grams - 2.5 Newtons, 2kg - 20 Newtons, Spring balance - Equipment that is used to measure a force, Arrows - How forces are represented, bigger, greater - The ___________________ the arrow, the ___________________ the force., Net force - Total force acting on an object, Balanced forces - A pair of forces that are equal in size and act in opposite directions, Unbalanced forces - A pair of forces that are unequal in size and direction., Remain in constant speed or at rest - Effect of balanced force, Change in speed, direction or shape - Effect of an unbalanced force, Addition (+) - Mathematic operation used to calculate forces acting in the same direction., Subtraction (-) - Mathematic operation used to calculate forces acting in different directions., 90N to the right - Calculate the net force acting on this cart., 100N to the left - Calculate the net force acting on this tug of war., 400N down - Calculate the net force acting on this box.,

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