Physics /A-Level PE AQA Biomechanical Movement Part 4

A-Level PE AQA Biomechanical Movement Part 4

Physics25 CardsCreated 3 days ago

This deck covers key concepts in biomechanical movement, focusing on forces, motion, and Newton's laws as they apply to angular motion.

How is air resistance shown on a free body diagram?

A force drawn from the centre of mass opposing the direction of motion of the body
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Key Terms

Term
Definition
How is air resistance shown on a free body diagram?
A force drawn from the centre of mass opposing the direction of motion of the body
What is net force?
This is the resultant force activity on a body when all other forces have been considered.
What is a balanced force?
When there are 2 or more forces acting on a body that are equal in size but opposite in direction
When is the net force 0?
When there is no change in state of motion
What is an unbalanced force?
An unbalanced force is created when a force acting in one direction is larger than the force acting in the opposite direction.
What is upward acceleration?
When the reaction force becomes greater than the weight force

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TermDefinition
How is air resistance shown on a free body diagram?
A force drawn from the centre of mass opposing the direction of motion of the body
What is net force?
This is the resultant force activity on a body when all other forces have been considered.
What is a balanced force?
When there are 2 or more forces acting on a body that are equal in size but opposite in direction
When is the net force 0?
When there is no change in state of motion
What is an unbalanced force?
An unbalanced force is created when a force acting in one direction is larger than the force acting in the opposite direction.
What is upward acceleration?
When the reaction force becomes greater than the weight force
What is angular motion?
Refers to rotation and movement around a fixed point
When does angular motion occur?
When a force is applied outside the centre of mass
What are the axis of rotation?
. Transverse . Sagittal . Longitudinal
What is a transverse axis?
It runs from side to side across the body (somersault)
What is a sagittal axis?
It runs from front to back (cartwheel)
What is a longitudinal axis?
It runs from top to bottom (spinning in ice skating)
What is torque?
It is the turning force and is the reason angular motion occurs. Torque causes an object to turn about its axis of rotation
What 2 things is torque dependent on?
1) the greater the size of the force, the greater the torque 2) application of the same force further away from the axis will increase torque
How do you calculate moment of force/torque (Nm)?
Force (N) x perpendicular distance from the fulcrum (m)
How do you calculate the resistance arm?
Moment of force (Nm) = force (N) x perpendicular distance from fulcrum (m)
How does Newton's first law apply to angular motion?
Every body continues in its state of rest or will turn about its axis of rotation unless compelled to change that state by an external force acting upon it
How does Newton's second law apply to angular motion?
The rate of change of angular momentum (acceleration) a body is proportional to the force (torque) causing it and the change that takes place in the direction which the force (torque) acts
How does Newton's third law apply to angular motion?
When a force (torque) is applied by one body to another, the second body will exert an equal and opposite force (torque) on the other body.
What is angular velocity?
Refers to rotational speed of an object and the axis about which the object is rotating. Its a vector quantity
How is angular velocity calculated (rad/s)?
Angular velocity (rad/s) = angular displacement (rad) / time taken (s)
What is angular acceleration?
Is the rate of change of angular velocity calculated by dividing the change in angular velocity (rad/s) by time taken (s)
How is angular acceleration (rad/s*2) calculated?
Angular acceleration (rad/s*2) = change in angular velocity (rad/s) / time taken (s)
What is moment of inertia?
Is the resistance of a body to change its state of motion when rotating
What is moment of inertia acting on a lever dependent on?
1) mass of the object 2) how mass is distributed from the point of rotation