NEWTONS FIRST LAW OF MOTION The first law

NEWTON’S FIRST LAW OF MOTION The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Velocity is a vector quantity which expresses both the object's speed and the direction of its motion; therefore, the statement that the object's velocity is constant is a statement that both its speed and the direction of its motion are constant.

NEWTON’S SECOND LAW OF MOTION Newton's Second Law Newton's first law of motion predicts the behavior of objects for which all existing forces are balanced. The first law sometimes referred to as the law of inertia - states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Objects at equilibrium (the condition in which all forces balance) will not accelerate. According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction.

NEWTON’S THIRD LAW OF MOTION A force is a push or a pull upon an object When you sit in your chair, your that results from its interaction with body exerts a downward force on another object. the chair and the chair exerts an Forces result from interactions! As upward force on your body. There discussed in Lesson 2, some forces result are two forces resulting from this from contact interactions (normal, interaction - a force on the chair frictional, tensional, and applied forces and a force on your body. These are examples of contact forces) and other two forces are called action and forces are the result of action-at-areaction forces and are the distance interactions (gravitational, subject of Newton's third law of electrical, and magnetic forces). motion. Formally stated, Newton's According to Newton, whenever objects A third law is: and B interact with each other, they exert forces upon each other. For every action, there is an equal and opposite reaction.

This law is exemplified by what happens if we step off a boat onto the bank of a lake: as we move in the direction of the shore, the boat tends to move in the opposite direction (leaving us facedown in the water, if we aren't careful!). Let's study how a rocket works to understand Newton's Third Law. The rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.

4. In the top picture (below), Kent Budgett is pulling upon a rope that is attached to a wall. In the bottom picture, the Kent is pulling upon a rope that is attached to an elephant. In each case, the force scale reads 500 Newton. Kent is pulling. . . a. with more force when the rope is attached to the wall. b. with more force when the rope is attached to the elephant. c. the same force in each case.

MRS. BATRA TH 8 BLUE KIMBERLY GOMEZ & ARCELIA