Principles of Force
A push or pulling object applied upon an object
Force
Fill in the blank: For every action there exists an equal and _________________reaction
opposite
The force that attracts an object towards the center of the earth
gravity
lever
What is an example of a first class lever in the body?
Nodding your head
What is force measured in?
Newtons
Force can be calculated by multiplying ______________ x ____________________
mass x acceleration
the frictional force that air applies against a moving object
air resistance
a fixed point about which the lever can turn
fulcrum
Doing a bicep curl is an example of which class lever?
third
The resistance of an object to any change in its state of motion
inertia
Which law is this? An object will accelerate when acted upon by an external force.
Newton's second law
a push or pull applied to an object provided by muscular contraction
muscular force
What are two other names for the fulcrum?
axis or pivot
A wheelbarrow is an example of which class lever?
Second
True or False: Acceleration can be a negative number
true-when an object is getting slower
Fill in the blanks: An object in motion ___________ in motion at the same ___________ and in the same ____________, and an object at _____________ stays at rest unless acted upon by an external force.
stays
speed
direction
rest
The reaction to the force that the body exerts on the ground
ground reaction force
In a second class lever, where is the resistance located?
Between the effort and the fulcrum
Plantar flexion is an example of which class lever?
Second
The rate at which an object changes speed
acceleration
What is another name for Newton's First Law of Motion?
Law of Inertia
Which force causes a sprinter to have an explosive start out of starting blocks?
Ground Reaction Force
In a third class lever, where is the effort located?
Between the fulcrum and the resistance
A leg curl is an example of which class lever?
Third