PE - Biomechanics

Learning Objectives… To understand Newton's laws To understand Newton's laws To be able to link Newton’s laws to sporting examples. To be able to link Newton’s laws to sporting examples. To understand the application of forces To understand the application of forces

Newton’s First Law of Motion Sporting Examples: “ A football will stay on the penalty spot until kicked” “A hockey ball will remain still until hit by the stick” “ A football will roll until slowed by friction or another player” “ A hockey ball will not fall from the air without the application of gravity” A body continues in a state of rest or uniform velocity unless acted upon by an external force.

Newton’s First Law of Motion A body continues in a state of rest or uniform velocity unless acted upon by an external force.

Newton’s First Law of Motion A body continues in a state of rest or uniform velocity unless acted upon by an external force. PUSH or PULLS can alter a body (object) in the following ways Cause a body to move (as seen in the previous slide) Cause a body to accelerate Cause a body to decelerate Cause a body to change direction Cause a body to change shape

Cause a body to accelerate Sporting example: Sailing boat. The force that causes the boat to acceleration is the wind. Forces Can -

Cause a body to decelerate Sporting example: Sailing boat. The force that causes the boat to deceleration is the wind.

Forces Can - Cause a body to change direction Sporting example: Tennis The force that causes the Ball to change direction is the racket impact.

Forces Can - Cause a body to change shape Sporting example: Golf The force that causes the ball to change shape is the impact from the club head. Ball shape is compressed by the force of the club head on impact

Newton’s Second Law of Motion Sporting Examples: “If you kick a football hard, it will go a long way” “If you kick a football softly it wont go very far” “If you hit a hockey ball to the left, it will go left” “If you hit a hockey ball to the right, it will go right” When a force acts on an object, the motion experienced by the object is proportional to the size of the force and in the direction in which it is applied.

Newton’s Third Law of Motion Sporting Examples: “If a rugby player pushes to the left with their foot, they swerve to the right.” “A high jumper needs to push down on the ground to be able to go up.” A football goalkeeper needs to push to the left with their feet in order to dive to the right.” For every action there is an equal and opposite reaction.

ACTION FORCE REACTION FORCE Action force is the goal keeper pushing down into the floor Reaction force is the goal keeper lifting into the air in the opposite direction