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### Transcript of PE - Biomechanics. Learning Objectives To understand Newton's laws To understand Newton's laws To be...

• PE - Biomechanics

• Learning ObjectivesTo understand Newton's lawsTo be able to link Newtons laws to sporting examples.To understand the application of forces

• Newtons First Law of MotionSporting Examples: A football will stay on the penalty spot until kickedA 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 gravityA body continues in a state of rest or uniform velocity unless acted upon by an external force.

• Newtons First Law of MotionA body continues in a state of rest or uniform velocity unless acted upon by an external force.

• Newtons First Law of MotionA 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 waysCause a body to move (as seen in the previous slide)Cause a body to accelerateCause a body to decelerateCause a body to change directionCause a body to change shape

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

• Forces Can -Cause a body to decelerateSporting example: Sailing boat.The force that causes the boat to deceleration is the wind.

• Forces Can -Cause a body to change directionSporting example: TennisThe force that causes the Ball to change direction is the racket impact.

• Forces Can -Cause a body to change shapeSporting example: GolfThe 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

• Newtons Second Law of MotionSporting Examples:If you kick a football hard, it will go a long wayIf you kick a football softly it wont go very farIf you hit a hockey ball to the left, it will go leftIf you hit a hockey ball to the right, it will go rightWhen 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.

• Newtons Third Law of MotionSporting 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 is the goal keeper pushing down into the floorReaction force is the goal keeper lifting into the air in the opposite direction