Transcript Newton`s Laws of Motion

Newton’s Laws of
Motion
Newton’s First Law
 The Law of Inertia
 Inertia- the tendency of an object to resist
a change in motion.
 An object at rest will remain at rest, and
an object moving at a constant velocity
will continue moving at a constant
velocity, unless it is acted upon by an
outside force.
Newton’s First Law
 On Earth, gravity and friction are unbalanced
forces that often change an object’s motion.
 The greater the mass of an object is, the
greater its inertia, and the greater the force
required to change its motion.
 Example: The tennis ball thrown in the air will
continue until the force of gravity and friction
will eventually stop the ball.
Newton’s Second Law
 The Law of Constant Acceleration
 Acceleration depends on the object’s
mass & on the net force acting on the
object.
 Acceleration= Net Force/ Mass
 Acceleration is measured in meter per
second per second (m/s²)
Newton’s Second Law
 To increase acceleration either decrease
the mass or increase the force.
 Example: Rolling a golf ball and a
bowling ball using the same force, the
golf ball would have a greater rate of
acceleration.
Newton’s Third Law
 If one object exerts a force on another object,
then the second object exert a force of equal
strength in the opposite direction on the first
object.
 For every action there is an equal but opposite
reaction.
 Example: When you hit a nail with a hammer,
the hammer exerts a force on the nail. The nail
exerts a force on the hammer, causing the
motion of the hammer to stop.
Newton’s Third Law
 Momentum means “a quantity of motion”
 Momentum= Mass x Velocity
 The more momentum a moving has, the
harder it is to stop.
 The conservation of momentum means
when objects collide momentum is not
lost but transferred from one object to
another.