Transcript quick quiz - Western Springs College

QUICK QUIZ
We’re going well team…let’s keep it
up!!
We are looking at Newton’s Laws today

1. Movement at knee?
2. Agonist?
3. Antagonist?
4. Movement at shoulder?
5. Agonist?
6. Antagonist?
7. Movement at elbow?
8. Agonist?
9. Antagonist?
NEWTONS LAWS, p113
The Law of Inertia
• An object that is moving or is at rest, will
remain that in that state (moving or at rest)
until acted on by an external force
INERTIA
• Inertia is
– An objects resistance to movement. It is a
product of its mass
• The amount of inertia a body has depends
on its mass. The greater the mass, then
generally the greater the bodies inertia will
be.
INERTIA
• The amount of force needed to change the
motion depends on the amount of Mass
and Acceleration
Law of Acceleration
• The acceleration of an object is equal to
the force causing it and is in the same
direction as the applied force
• Force = Mass x Acceleration (F=mxa)
The Law of Acceleration
• In Summary we can say:
a) The greater the force, the greater the
acceleration
b) The smaller the mass, the greater the
acceleration when a constant force is
applied
c) The mass will accelerate in the direction
the force is applied
The Law of Action/Reaction
• For every action there is an equal and
opposite reaction
“What goes up, must come down”
When we apply a force to something, this is
known as Action force
The object we apply force to, applies a force
back, a reaction force.
These two forces always work in pairs