Does forces have an effect on speed or acceleration

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity.

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c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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