Forces are needed to lift, turn, move, open, close, push, pull, and so on. When you throw a ball, you are using force to make the ball move through the air. More than one force can act on an object at the same time. Think about all the different forces you need to ride your bike. Your feet push on the pedals, your hands push and pull the handlebars, and the muscles in your body help you stay balanced. The tires are pushing against the pavement, while the pavement is pushing back on them. Wow, that’s a lot of forces!
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Forces have a magnitude (strength) and a direction. Forces can be represented as arrows with the length of the arrow representing the magnitude of the force and the head of the arrow pointing in the direction of the force. Using such arrows, the resulting force (net force) and direction can be determined.
Balanced forces will cause no change in the speed of an object.
Unbalanced forces are not equal, and they always cause the motion of an object to change the speed and/or direction that it is moving.
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