Transcript Newtons Laws and projectile motion

Isaac Newton developed three laws that help us
explain the relationship between forces acting on
a body and the motion of a body
Newton’s First Law
“An object at rest tends to stay at rest
until acted on by some external force”
Likewise, an object in motion will stay in motion until acted on by
another force.
This Law can also be known as.. The Law of
75 Kgs
125 Kgs
There are advantages and disadvantages to
having a lot of inertia in different sporting
situations.
With the person beside you:
Come up with an example of when a lot of inertia would be an
advantage
AND when it would be a disadvantage in a sporting situation.
•How can we apply this law to golf?
Newton’s Second Law
“When a force acts upon a mass, the
result is acceleration of that mass”
This Law can be summarised by an
equation
The greater the force,
The smaller the mass,
when a constant force is applied
The mass will accelerate in the direction
Consider the situation of a golf swing, How can we apply Newton’s
Second Law to produce a more powerful strike??
PROJECTILES!!
Angle of release
Determines the flight path of the projectile
High angle of release = Longer flight time but less distance
Low angle of release = Shorter flight time but more distance
How can this be applied to golf
club selection??
Driver and long irons have shallow angle
on the club face, driver is angled at 9
degrees, these are designed to get
distance.
Short irons and wedge have steeply
angled club faces, 46 degrees for a
wedge and are designed to get height
and have stopping ability
Speed of release
Speed of release has two components:
•Vertical velocity
•Horizontal velocity
•What are the advantages of having high vertical velocity??
•In which sports would this be an advantage?
•What are the advantages of having high horizontal velocity??
•In which sports would this be an advantage??
Height of release
Always the same in golf – off the tee.
Spin
TOP SPIN – shot will dip suddenly and
therefore results in decreased
distance.
A top spin shot creates a region of high pressure
on top of the ball and low pressure below.
BACK SPIN– increased distance
High pressure is created under the ball with a
lower pressure area on the top, causing the ball to
float
These forces are known as magnus forces or the magnus effect.
Newton’s Third Law
“For every action, there is an equal and
opposite reaction”
•What goes up must come down!
•Action Force
•Reaction force
These two forces ALWAYS work in pairs
Think about where the
ACTION and REACTION
forces are on these
athletes:
How does this law work with golf??