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- Newton's first Law of Motion: Unless acted upon by an unbalanced force, an object at rest stays at rest, and an object in motion continues to move in a straight path at an constant rate. The mass of an object and the amount of force exerted determine its acceleration. Every time one object applies force to another, the other applies an equal and opposite force to the first.Explanation: The scooter will move if the boy rides on it, and the boy needs to keep using his feet so it won't stop.
- An object's acceleration is indirectly related to its mass and directly proportional to the net external force acting on it. Put differently, for a given mass, more force produces greater acceleration, while for a given mass, less acceleration results from a specific force.Explanation: The smaller box will move faster than the big box because it has less mass.
- An object's acceleration is indirectly related to its mass and directly proportional to the net external force acting on it. Put differently, for a given mass, more force produces greater acceleration, while for a given mass, less acceleration results from a specific force.Explanation: The smaller box will move faster than the big box because it has less mass.
- Forces are the subject of the terms "action" and "reaction"; when object A applies a force to object B, object B responds by applying an equal and opposite force to object A. Guns are one example, as are standing on the ground and moving an object.Explanation: A gun recoils when a bullet is fired from it, When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction.
- ReactionRecoil force of the gun.
- ActionAccelerating force of the bullet
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