Biomechanics - PSK 4U Inquiry Assignment #5: Biomechanics...

PSK 4U
Inquiry Assignment #5: Biomechanics
A. Newton’s Laws
Find (or take) a picture(s) that demonstrate(s) the use of each of the 3 laws of
motion, and explain how it (they) illustrate(s) the law of motion. For example, you
might select a picture of someone pushing or pulling an object and explain how it
demonstrates the second law of motion.

2. Newton’s Second Law of Motion
Newton’s second law states that the acceleration of an object is directly related to
the net force and inversely related to its mass. Acceleration of an object depends
on two things, force and mass. In this picture there is a man pushing two balls.
One ball is heavier than the other. It is obvious that the man uses more force to
push the heavier ball because as the mass of the object increases, the force will
increase to remain the same acceleration (F=m*a).
3. Newton’s Third Law of Motion

Newton’s third law of motion states that for every action in nature there is an
equal and opposite force but the forces are exerted on different objects. For
example, in this picture, the objects are the air inside the balloon and the balloon.
When the balloon is open, the air is able to get out because of the elasticity of the
balloon(the elasticity of the balloon pushes the air inside the balloon), which
produces a force to the air. On the other hand, since the air inside of the balloon
comes out, it also pushes the air around the balloon. Therefore, the air around
the balloon pushes the balloon forward. This is the complete process of an
example of Newton's third law of motion.
B. Torque
Research the definition of the biomechanical principle of Torque, and find a
picture that represents it. Explain how this picture represents this principle.

The force produces torque in order to change the rotation of the object and its angular
momentum. Torque is produced when the line of action of the force does not pass
through the axis of rotation but creates a torque arm. There are seven biomechanical