Unit 6 Forces A ______________ is a push or pull. Force is measured in ______________, which is represented with a ______________. One Newton is equal to ______________. __________ force, also known as _____________ force, is the sum of the forces acting on an object. When the forces that are acting on an object are of ______________ strength but in opposite directions, this is called a ______________ force. When the forces are ______________ of equal strength in opposite directions, or if the force(s) are only acting in ______________ direction, the forces are ______________. Unbalanced forces cause a ______________ in position, speed, or direction. Types of Forces Type of Force Symbol Description Applied Force (Push) Fapp Force of Gravity Fgrav Normal Force Fnorm Friction Force Ffrict Air Resistance Force Fair Force that acts with objects that are traveling through air. Ftens Force that is transmitted through a ___________, rope, cable or___________ when it is pulled tight. Tension Force Example Force that is ______________ to an object by a person or another object. The _____________________ on objects. The ___________________ exerted upon an object that is in contact with another stable object. This force is in the _____________ direction than a _______________ and ________________ an object. Force Diagrams Force diagrams are used to show the ______________ and _____________ of the forces acting on an object through vectors or arrows. Practice: In each of the following situations draw and label which, if any, of the following forces are acting on the object. Make sure forces are drawn to a proper scale. Use the small dot provided to represent the object. Forces: Fapp, Fgrav, Fnorm, Ffrict, Fair, Ftens, 1. A small object lies motionless on a floor. 2. A small object hangs motionless from a rope. 3. An object is sliding across a smooth floor (no friction) at a constant speed. 4. An object is sliding to the right across a rough floor with friction and slowing down. 5. An object is being pulled by a rope to the right on a smooth floor (no friction). 6. An object is being pulled to the right by a rope on a rough floor with friction at a constant speed. 7. An object is being pushed to the right on a rough surface with friction and accelerating to the right. 8. An object that has been tossed up into the air just after it was released. (Ignore air resistance.) 9. An object that has been tossed up into the air at the very top of its trajectory. (Ignore air resistance) 10. An object in the air falling to the floor with no air resistance. 11. Your classmate does not want to leave Science class. You apply a force to drag him to lunch to the right. 12. A monkey sitting in a tree.