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Physics of Golf
5
THE END
Newton's Third Law of Motion
Free Body Diagram: Club Hitting the Ball
- Newton's Third Law: all forces come in pairs; each force is equal and opposite
Force of Tee
- When the ball is resting on the tee, it applies a force on it due to gravity, and the tee applies an equal force upward onto the ball.
- When the ball is hit by the club, the club produces a force onto the ball, and the ball produces an equal and opposite force on the club.
- When the ball lands on the ground in the hole, it pushes onto the ground and the ground produces an equal upward force.
Force of club
Force of Ball
Force of Ball (weight)
Newton's First Law of Motion
WELCOME TO
- Newton's First Law (objects in motion or rest stay in motion or rest in the absence of an outside force) is present in these circumstances:
Video Clip: Roberto Castro
- The ball remains at rest on the tee; no force that causes the ball to move acts on it
- In mid air, the ball continues to move with a nearly constant horizontal velocity directed north, as barely any horizontal force (air resistance) acts on it
Sports Physics:
Physics of Golf
- The golf ball continues to stay in motion until going into the hole, where air resistance and friction work to stop the ball's movement
- This tendency to stay in motion or rest is called INERTIA
Gerard Llanes and Pablo Burgos
Newton's Second Law of Motion
- Newton's Second Law: acceleration is directly proportional to an unbalanced force and indirectly proportional to the object's mass
Velocity, Acceleration, and Vector
- Had Castro used the same amount of force on the golf ball to accelerate an object with more mass, the acceleration would have been lower
DIRECTIONS
- Had Castro used a greater force on the same golf ball, the acceleration would have been greater
South
FORCE OF CASTRO'S CLUB ON THE BALL:
North
Force = Mass x Acceleration
Force = 0.05kg x 40,000m/s
Force = 2000N
- For a very small fraction of a second, the golf ball accelerated north when coming in contact with Castro's club.
Sliding Friction
- In mid air, the golf ball had a constant horizontal velocity directed north.
- In a golf swing, shoes tend to slide against the grass
- Since the golf ball changed from being in rest to being in motion, there was a net force caused by the unbalanced force of the club.
- Because of this, golf shoes tend to have a high mu, or coefficient of sliding friction
- Mu = Force of Friction/Normal Force
- Mu = 457.54 N/703.9 N
-Mu = .65
- A high mu of .65 in a golf shoe increases its friction with grass, preventing too much sliding