Newton

1
Newtons Laws
2
Suppose you are at a hockey game when you see a
player strike the puck with his stick. As the
puck slides across the ice, consider the
following
What force causes the puck to start moving?
What force keeps the puck moving as it slides
across the ice?
3
Newtons First Law of Motion
An object _________________________________. An
object _________________________________
_________________, unless acted on by an outside
force.
Newtons First Law can be described using one
word
4
Newtons First Law
There are TWO conditions here and one
constraint. Condition 1 The object CAN move
but must be at a CONSTANT SPEED Condition 2
The object is at REST Constraint As long as the
forces are BALANCED!!!!! And if all the forces
are balanced the SUM of all the forces is ZERO.
5
What if it is NOT at Equilibrium?

• If an object is NOT at rest or moving at a
  constant speed, that means the FORCES are
  UNBALANCED. One force(s) in a certain direction
  over power the others.

6
Newtons Second Law

• A ___________will cause a ________ to
  _______________. The ____________________ of an
  object is directly proportional to the
  ______________________ and inversely
  proportional to the __________________.

7
Second Law of Motion Continued.a special case!
Weight or Force due to Gravity ______________ ____
___________________________________________.
8
What is the weight of an 85.3-kg person on earth?
On Mars where g3.2 m/s2 )?
9
Newtons Third Law

• For every action there is an _________________
  and _______________________ reaction.