laws of motion

• inertia - defined as the tendency of matter to resist a change in its state of motion.
• Inertia - is dependent on the mass of an object. A more massive object has greater inertia.
• law of inertia - restatement of Galileo’s conception of inertia and how it affects motion.
• law of inertia - explains why it is hard to move a boulder or to stop a train when it is moving
• law of inertia - states that an object will remain in its state of motion (either stationary or moving at constant velocity) unless acted upon by a net external force.
• According to Isaac Newton, an object can only accelerate when a net force is acting on it.
• law of acceleration - states that the acceleration of an object is proportional to and in the same direction as the net force acting on it.
• with constant mass, the expression can be written as: a=F/m
• a = m/s^2
• F = kg
• F = kf x m/s^2 (Newton)
• the greater the amount of force, the greater the acceleration of the object
• the force and acceleration of an object is dependent on its mass
• the greater the mass of an object, the smaller its acceleration
• law of acceleration - states that the acceleration of an object is proportional to and in the same direction as the net force acting on it.
• law of interaction - describes how an action results in an equal and yet, opposite reaction
• law of interaction - states that when an object exerts a force on another object, the second object exerts another force that is equal and opposite in direction. These forces are called action–reaction pair
• action-reaction forces

  Two forces may only be considered as an action-reaction pair if and only if these forces are: (1) acting on two different bodies; (2) acting simultaneous on the system of two bodies; (3) in opposite directions; and (4) have the same magnitude.
• law of interaction - normal force and weight cannot be considered as action-reaction force because they act on the same body
• the opposite forces acting on a between two bodies is called action-reaction pair