Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
KIN 330
Exam 3
| Question | Answer |
|---|---|
| _______________ are the turning effect produced by a force acting on a restrained system | Torques |
| Torques are directly proportion to the ______________ of force as well as the ____________ between the point of application of the force and the axis of rotation | Magnitude; distance |
| Torque= ____x______ | Force x distance |
| _________ torques are produced by forces within a system (human body) | Internal |
| ___________ torques are produced by forces outside the system (human body) | External |
| During _________ ___________ there is no linear or angular acceleration | static equilibrium |
| When ___________ external torque (magnitude) = internal torque (magnitude) | Stationary |
| The ____________ component creates internal torque and causes motion | Rotary |
| The _______________ component does not contribute to internal torque, and causes joint compression or distraction | Non-rotary |
| A ___________ is a simple machine consisting of a relatively rigid bar that may rotate around a fulcrum | Lever |
| In a lever the _________ forces cause rotation | Motive |
| In a lever the ___________ forces resist rotation | Resistive |
| In a ________ class lever the axis is between the motive force and resistive force (MAR) | First |
| Elbow extension is an example of a _________ class lever | First |
| In a _________ class lever the resistance force is in the middle (ARM) | Second |
| A push up and a landmine press exercise is an example of a ___________ class lever | Second |
| A ___________ class lever always has the mechanical advantage | Second |
| In a _________ class lever the motive force is in the middle (AMR) | Third |
| Third class levers have an advantage in ________ and ________ of movement but a disadvantage in ________ | ROM and speed; Force |
| ___________ ____________ is the ratio of the lever arm of the motive force to the lever arm of the resistive force for a given lever | Mechanical Advantage |
| Mechanical advantage= Lever arm _________/ lever arm __________ | Lever arm motive/ lever arm resistive |
| If the MA<1 it is a mechanical ____________ | Disadvantage |
| When the muscle force is greater than the resistive force the lever is a mechanical _____________ | Disadvantage |
| If the MA>1 the lever is at a mechanical ___________ | Advantage |
| When the muscle force is less than resistive force the lever is at mechanical ___________ | Advantage |
| A motive force can move a resistance through a _________ ROM when the motive force lever arm is shorter than the resistance force lever arm | Larger |
| _________ is the product of force and amount of displacement in the direction of that force | Work |
| Work= _____ x ____ | F x distance |
| To calculate ________ you need 1) average force acting on an object, 2) direction of force acting on an object, and 3) displacement of an object along the line of action of the force during the time force acts on an object | Work |
| _______ work is adding energy | Positive |
| _________ work is removing energy from a system | Negative |
| If F and d point in the same direction the work done is ___________ | Positive |
| If F and d point in the opposite direction the work done is _________ | Negative |
| During an isometric movement _______ work is done | Zero |
| During a concentric movement _________ work is done | Positive |
| During an eccentric movement _________ work is done | Negative |
| In work problems F and d must be ___________ to each other | Parallel |
| __________ is the capacity to do work | Energy |
| Energy is a _________ quantity | Scalar |
| Mechanical kinetic energy is the energy of ________ | Motion |
| Objects only possess KE while ____ __________ | In motion |
| Mechanical potential energy is the energy of __________ | Position |
| _________ energy is the energy due to the change of position in gravitational field | Potential |
| Strained or elastic energy is the energy due to ____________ | Deformation |
| Strained Energy= ____x_____x_____ | 1/2 x k x x^2 |
| When gravity is the only external force the total mechanical energy __________ ____________ | Remains constant |
| TE= _____ + ______ | KE + PE |
| At any point in time W= ____ | TE |
| So we can say W= change in ______ + Change in ______ | Change in KE + Change in PE |
| If vertial position is held constant W= (_________-_______) | KEf-KEi |
| W=(KEf-KEi) can be re-written as __________ | Fxd= (1/2mv^2f-1/2mv^2i) |
| Power= ________/__________ | Work/time |
| Newtons first law is the law of _________ | Inertia |
| Every body continues in its state of rest, or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it is Newtons _________ law | First |
| The second law of motion is the law of ______________ | Acceleration |
| The change of motion is proportional to the force impressed and is made in the direction of the straight line in which that force is impressed is newtons __________ law | Second |
| Change of motion= acceleration is newtons ____________ law | Second |
| m(Vf-Vi) is called the ________________ | Momentum |
| The summation of the forces multiplied by the change in time is called the _______________ | Impulse |
| ________________ is the quantity of Motion | Momentum |
| An object that has both _________ and a _____________ is said to have momentum | mass; velocity |
| Units for momentum are _________ | kg x m/s |
| _____________ is when force is applied to a body, the resulting motion is dependent upon both the magnitude and duration of force | Impulse |
| Impulse (p)= ____ x _____ | F x change in time |
| Momentum changes rely on _____________ | Impulse |
| ___________= change of momentum | Impulse |
| A __________ landing is dissipating a large force over a short time | Hard |
| A _______ landing is dissipating a large force over a long time | Soft |
| Newtons 3rd law of motion is the law of ___________ | Reaction |
| Each force has an equal and opposite reaction is newtons _____ law | 3rd |
| During _________ ________________ no linear or angular acceleration is present and the summation of the torques=0 | Static equilibrium |
| When _____________ external torque magnitude= internal torque magnitude | Stationary |
| Any force located some distance from an axis (lever arm) will produce a ______________ | Torque |
| When calculating torque we must use the _________________ component of the force | Perpendicular |
| The _______________ component of the force will not produce torque | Parallel |
Created by:
sschichtel