Biomechanics 2 – Newton’s Laws of Motion 2.2 A BALL OF A TIME!

 What is a force?  A push, pull or twist that causes objects to move, speed up, slow down, stop or change direction.  Force = Mass x Acceleration Force

Newton’s 1 st Law of Motion An object at rest tends to remain at rest unless acted upon by some external force. An object in motion will stay in motion in a straight line until acted on by an external force. Which of the following has the greater Inertia and why? 30kgs 20kgs Answer: 30kg weight because it has a greater mass

Newton's first law

Newton’s 1 st Law of Motion 1.Basically inertia is an objects resistance to movement. Having a great deal of inertia can be an advantage in some sports – Can you think of three? Of course having a lot of Inertia can have a disadvantage in some sporting situations. How? If you have a lot of Inertia you require a lot of force or effort to get moving.

Newton’s 1 st Law of Motion  The ball will keep travelling until gravity/air resistance pulls it down or player blocks the ball.

Newton’s 2 nd Law of Motion 2. When a force acts upon a mass, the result is acceleration of that mass. Consider the following three balls: a) If each is hit with the same amount of force, which one accelerates the most? Why? The table tennis ball – because it is lighter b) If the tennis ball is hit with gradually increasing force, what happens to its acceleration? The acceleration will increase with increasing force

Newton's second law

Newton’s 2 nd Law of Motion So considering this 2 nd law we can say…  The greater the force, the greater the acceleration  The smaller the mass the greater the acceleration when a constant force is applied.  The mass will accelerate in the direction the force is applied. How could you apply Newton’s 2 nd Law to a sporting situations

Newton’s 3 rd Law of Motion 3. For every action, there is an equal and opposite reaction. a)When we apply a force to something, this is known as action force b)The object we apply a force to, applies a force back a reaction force. On the following pictures, draw in and label the two forces in action action reaction action reaction

Newton's third law

Part 1: Newton’s Law of Motion Law #3 We can see pairs of forces working when we run on sand. We run forward and sand is kicked up behind us in the opposite direction. What other example of this can you think of? When a ball is bounced, it bounces back in a direction opposite to that in which it was dropped

Newton’s 3 rd Law of Motion  The incoming ball is the Action Force.  Your body acts as a reaction force.  Because your body has the greater Inertia, the ball is the reaction reaction action

Can you apply the 3 rd law to passing in netball?  Analyse this shoulder pass.  Where would you put the necessary arrows?  Come draw on the board