Newton's Laws
Force Summation is...?
Using our body in a sequential manner to produce maximum force
The centre point of a body’s mass, the point about which all parts are equally balanced is called?
Centre of Gravity (CoG)
What are the three factors affecting the flight of a projectile?
1. Angle of Release
2. Height of Release
3. Speed of Release
What is the fulcrum?
The axis/point of movement in a lever (eg a joint in the body)
The four factors that influence Force Summation are?
Body parts in action (number of muscles/joints used)
Sequence (of muscle contraction)
Timing (of muscle contraction)
Range of motion
The area within the body’s points of contact with the ground is called?
Base of Support (BoS)
Explain FLE123 when we are trying to determine which lever is which?
F (1) - Fulcrum in the middle. L (2) - Load in the middle. E (3) - Effort in the middle.
To produce maximal force in a movement/action, large muscles near the midline of the body contract first. True or False?
True
An imaginary vertical line that passes through the centre of gravity is called?
Line of Gravity (LoG)
What is Newton's Second Law?
The acceleration of an object is directly proportional to the amount of force applied, in the direction that the force is applied and is inversely proportional to the mass of the object
Longer levers (limb length or the addition of equipment ei baseball bat) increase force by..?
Increasing mechanical advantage. ei Think of pushing a hinged door at the door handle vs close to the hinges, which is easier?
Choose the sequence of muscle contractions that would produce the greatest force in discus throw.
A. Trunk/Abdominals, Glutes, Pectorials/Deltoids, Forearm
B. Trunk/Abdominals, Glutes, Forearm, Pectorials/Deltoids
A. Large muscles near the midline (proximal) of the body contract first with the smaller muscles closer to the extremities (distal) of the body contract last.
A body is balanced when..? (Three point answer)
1. The LoG falls within the BoS
2. You have a WIDE base of support
3. You have a LOW centre of gravity
Using Newton's 2nd Law (F=MA), complete this problem: A 10 kg bowling ball would require what force to accelerate down an alleyway at a rate of 3 m/s/s? (Hint: F=Force, M=Mass, A=Acceleration)
F = MA. = 10 x 3. = 30N.
Which class of lever is most present in the body and why? (provide an example).
Third Class. Fulcrum - Effort - Load
How does increased Range of Motion (RoM) increase force production?
Increase RoM gives the lever used (limb or equipment) a greater path (distance) to travel through, which allows for greater force to be generated. Eg think of a golf or baseball swing
What is the difference between Balance and Stability?
BALANCE is used to describe when a body is maintaining a steady position in space and remains upright
STABILITY means the ability to retain ones balance while experiencing factors that disturb balance