Force:
- Force is a Vector
- Definition: A push or pull acted upon an object resulting from the interaction of the object with another object, and it only exists as a result of interaction
Unbalanced Force
- If there is no unbalanced force acted upon an object and thus it is maintain its state of motion, this object is said to be at equilibrium.
- Unbalanced forces cause acceleration.
Two categories of force: contact force/ force resulting from action-at-a-distance
Contact forceDefinition: forces that result when two interacting objects are perceived to physically contact each other.
|
Action-at-a-distance forceDefinition:forces that result even when the two interacting objects are not physically contacting with each other.
|
The Unit: NEWTON
- Metric unit of Force: Newton (N)
- Definition:One Newton is the amount of force required to give a 1-kg mass an acceleration of 1m/s/s.
MassDefinition: the only quantity depends upon inertia, they are in direct proportional to each other.
|
WEIGHT
Definition: the force of gravity acting upon that object.
|
Sliding FrictionDefinition: results when an object slides across a surface
|
Static FrictionDefinition: Results when the surfaces of 2 objects are at rest relative to one another and a force exists on one of the objects to set it into motion relative to the other object.
Explanation: When you try to push something but fail to change its state in motion, that's because Static Friction balances the force that you exert on the object. Property:
|
Formula:
Ffrict-sliding = μfrict-sliding • Fnorm μrict-sliding : Definition: coefficient of sliding friction between the 2 surfaces. Property:
|
Formula:
Ffrict-static ≤ μfrict-static• Fnorm μfrict-static: definition: the coefficient of static friction between the two surfaces. Property:
|
Net Force (Fnet):
- Definition: the vector sum of all the forces that act upon an object in one dimension.
- Property: Opposite forces will cancel each other
- Application: it causes mass to accelerate
The Types of Forc
Type of Force
(and Symbol) ____________________ ☆Applied Force Fapp ____________________ ☆Gravity Force (or Weight) Fgrav ____________________ ☆Normal Force Fnorm ____________________ ☆Friction Force Ffrict ____________________ ☆Air Resistance Force Fair ____________________ ☆Tension Force Ftens ____________________ ☆Spring Force Fspring |
Description of Force
____________________________________________________________________________________________________________ ☆A force that is applied to an object by a person or another object. ____________________________________________________________________________________________________________ ☆the force with which massively large object attracts another object towards itself. This is also the weight of the object. The force of gravity on earth is always equal to the weight of the object as found by the equation: Fg = m • g g(the gravitational field strength) = 9.8 N/kg (on Earth) m = mass (kg) ____________________________________________________________________________________________________________ ☆The support force exerted upon an object that is in contact with another stable object. ____________________________________________________________________________________________________________ ☆The force exerted by a surface as an object moves across it or makes an effort to move across it. There are at least two types of friction force: sliding and static friction. Factor: ____________________________________________________________________________________________________________ ☆a special type of frictional force that acts upon objects as they travel through the air. ____________________________________________________________________________________________________________ ☆The force that is transmitted through a strip when it is pulled tight by forces acting from opposite ends. The tension force is directed along the length of the strip and pulls equally on the objects on the opposite ends of the strip. ____________________________________________________________________________________________________________ ☆The force exerted by a compressed or stretched spring upon any object that is attached to it. |