Transcript Newton`s 2nd Law

Newton’s Second Law
Objective
► At
the end of today, you will be able to
explain:
 The greater the force exerted on the object, the
greater the acceleration.
 For any force, the greater the mass of an object,
the smaller the acceleration.
►
And the smaller the mass, the larger the
acceleration.
Newton’s Second Law
Newton’s 2nd Law
► Shopping
Cart Simulation-
 What happens when more force is added
to an object with the same mass?
 What happens to the acceleration when
the same force is applied to a larger
mass?
What is the relationship between
force and acceleration?
►
The harder you push or
pull something, the faster
it will accelerate.
►
Force and acceleration are
directly proportional.
 This means whatever
happens to one quantity
happens to the other.
What is the relationship between
mass and acceleration?
► As
the Mass
goes up
►
► The
Acceleration
goes down
What is the relationship between
mass and acceleration?
► Mass
and acceleration
are inversely
proportional.
►
► That
means if one
increases, the other
decreases.
Zero Net Force
► If
there is zero net force, then a = 0.
 F = ma
► However,
an object can be moving even if
there is zero net force on the object.
 It is moving with a constant velocity
►Constant
speed and constant direction (straight line)
►Velocity remains the same if there is no
acceleration.
How does this picture
demonstrate Newton’s 2nd Law?
Exit Ticket
► Johnny
and Peggy Sue are each going to
push a 25 kg weight plate. Johnny is going
to apply a force of 50 N, and Peggy Sue is
going to apply a force of 100 N. What is
each person’s acceleration? Is there a
difference between their accelerations? If
so, explain why they are different.
► Remember: a=F / m