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Newton's Laws
COVERT - First, Second and Third Laws
Term | Definition |
---|---|
Balanced Forces | Two or more forces exerted on an object. |
Why when effects ARE canceled out do they NOT cause a change in motion? | because Balanced forces means the Net force is zero. |
Force | A push or pull. |
Velocity | Speed and Direction of a moving object. |
Net Force | Combination of all forces acting on an object. |
With more than on force, this determines the motion of an object | Net Force |
Unbalanced forces | Effects don't cancel each other; motion of object changes |
Newton's First Law of Motion | If the net force of a single object is zero, the object remains at rest. |
Newton's First Law of Motion | If an object is in motion, it continues to move in a straight line with constant speed, as it stays in motion, unless acted upon by a force. |
Friction | the force that brings everything to a stop, and acts to resist sliding between two touching surfaces. |
Static Friction | prevents an object from moving when a force is applied. Upward force must be overcome to move an object with mass. |
Sliding Friction | To slide across a surface, friction must be overcome. |
Rolling Friction | occurs between the ground and wheels to keep tire from slipping on the ground. |
Fluid Friction | A type of force that causes resistance in liquid or in air. |
Gravity | pulls and attracts objects toward each other. |
Newton's Second Law of Motion | Connects Force, Acceleration and Mass A (meters per second per second) = net force in Newtons / mass in kg |
Newton's Second Law of Motion | a is for acceleration, m is for mass, and Fnet is net force. |
Newton's Second Law of Motion | Speeding up or Slowing down, Acceleration tells how velocity changes. |
Newton's Second Law of Motion | turning = a curved path circular Motion = constantly accelerating |
Air Resistance | A form of friction that acts to slow down any object moving in the air. |
Center of Mass | A point in an object that moves as if all the object's mass were concentrated at that point. |
Newton's Third Law of Motion | forces always act in equal but opposite pairs. |
Newton's Third Law of Motion | for every action there is a reaction. |
Newton's Third Law of Motion | when one object exerts a force on another object the second object exerts the same force on the first object. |
Falling Objects with different mass | accelerate with the same rate but do not hit the ground with the same force. |
Action and Reaction Pairs | do not cancel because they act on different objects. |
Inertia | is the tendency of an object to resist any change in it's motion and the greater the inertia then the greater force needed to change it's motion. |
Free fall | an object is in free fall if the only force acting on the object is gravity |
9.8 m/s/s | that rate at which all objects free fall |
Weightlessness | the condition that occurs in free fall when the weight of an objects seems to be zero |