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

Force & Motion

8th Grade Physical science

Force A push or pull causing an object to change its speed or direction.
Contact Force A force exerted during contact between objects.
Static Friction The fore that resists the start of sliding motion between two surfaces that are touching.
Kinetic Friction The force that resists the movement of two surfaces that are touching AND are moving relative to each other.
Drag A friction-like force that opposes (resists) the motion of an object in fluid or air.
Non Contact Force A force exerted on objects that are not in contact (touching).
Net Force The combination of all the forces acting on an object.
Balanced Forces When net forces acting on a object equal 0 (zero) Newtons. Balanced forces will not cause a change in the motion of a moving object, and objects at rest will remain at rest.
Unbalanced Forces When the net force acting on a object is greater than (>) 0 (zero) Newtons. Unbalanced forces cause a change in the object's motion.