Newton’s Laws of Motion

Sir Isaac Newton Born Jan. 4, 1643 in England. As a young student he didn’t do well in school. He worked hard and continued his education. Later in life he enjoyed learning and contributed ideas that became law to the science and math world.

Newton’s First Law of Motion “An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon an outside force.”

Newton’s 2nd Law of Motion The acceleration (change of speed or direction) of an object depends on its mass and the amount of force applied.

Newton’s Second Law of Motion Force = mass X acceleration

Equal force on different masses will result in different accelerations For example… Equal force on different masses will result in different accelerations

Newton’s Third Law of Motion "For every action, there is an equal and opposite reaction." Reaction Action

Fill in Notes: Newton’s Second Law F = ma What does the equation mean? F = Force (unit is Newtons) m = mass (unit is Kilograms) a = acceleration (unit is meters/second2)

Units Force is measured in Newtons Mass is measured in grams, kilograms etc. Acceleration - the rate at which an object changes its velocity." (remember: speed with direction) Acceleration values are expressed in units of velocity/time. Typical acceleration units include the following: m/s/s mi/hr/s km/hr/s

Remember that velocity is the speed and direction of an object. And… Remember that speed is the rate of change of an objects position. Well… Acceleration is the rate of change of an object’s velocity.

Force is defined as a push or pull that one object exerts on another object. Mass is the amount of matter contained in an object.

So what does this mean… *Newton found a connection with force, mass and acceleration. Force = mass x acceleration * You will need to use the “Triangular Formula” to solve for problems.

Newton’s Second Law F m a