Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
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


Internal / External Forces

Internal Forces (muscle strength) Skilled movement depend on the summation, continuity and direction of forces
Summation of forces Achieved by combining the forces generated by several different joints and muscle groups (tug of war)
Continuity of forces Movement should begin with the larger muscle groups and progressively move towards the smaller muscles.
Direction of forces For every action there is an equal and opposite reaction.
Errors of direction of force Strength imbalance. Incorrect body position. Poor technique.
External Forces Gravity. Depending on the position of the limb or body, the same movement can work different muscle groups.
Inertia Resistance to a change in motion. Force is required to slow down, stop and change direction of movement. More momentum more force is required.
Levers Rigid body that rotates about an axis or fulcrum. Muscluar force is applied where muscle inserts in the bone and not in the belly of the muscle, or at the joint itself,
Created by: LisaSceviour