2 Newton’s Second Law of Motion The net force acting on an object causes that object to accelerate in the direction of the net force.Greater the force = Greater acceleration.FF
3 Newton’s Second Law of Motion Inverse relationship between mass and acceleration!!!The greater the mass, the more force it takes to accelerate an object at the same rate of a less massive object!!!FF
4 Newton’s Second Law of Motion The relationship between force, mass, and acceleration is expressed as:F = maSI unit = kg x m/s² = N
5 Sample ProblemWhat is the force of a baseball weighing 0.06 kg that is accelerating towards a wall at 5,500 m/s²?m = 0.06 kga =5,500 m/s²F = ma= (0.06 kg x 5,500 m/s²) =330 N
6 Newton’s Third Law of Motion Single isolated forces cannot exist!Forces always exist in pairs (action- reaction pair).“Whenever two objects interact, the force exerted on one object is equal in strength and opposite in direction to the force exerted on the other object.”
7 Force of the astronaut on the satellite Force of the satellite on the astronautThe most important thing to keep in mind about action-reaction pairs is that each force acts on a different object.
8 How does a nail get driven into a piece of wood by a hammer? Example 2:How does a nail get driven into a piece of wood by a hammer?Force of the nail on the hammerForce of the hammer on the nailForce of wood on nail