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Unbalanced Forces, Chap 2 Lesson 3 Newton’s Second Law of Motion, pg 109-110 Vocabulary review: 1) When an object changes _______________or ______________, its Speed________________________________________________ velocity changes, and the object is accelerating. The units of ______________________________________________________ _________________________ are meter/second2 2) When the ________ __________ is zero, the Velocity _______________________________________________ _____________________ is zero. When the acceleration of an ______________________________________________________ object is zero, the __________________ is constant. In other words, only _______________________________ forces cause the Acceleration ___________________________________________ motion of objects to __________________________. ______________________________________________________ ______________________________________________________ To Summarize: Unbalanced Forces and Velocity, pg 106-108 _____1) When an unbalanced force acts on a resting object, the object ___________________________ a) remains at rest b) accelerates in the direction of the force. 1) Whenever an object’s speed or direction changes, a(n) _____________________________ force must be acting on the object. a) When a resting object is acted on by an unbalanced force, the object will ______________________________ in the direction of the unbalanced force. b) An object’s speed will _________________ when a net force acts in the same direction of the object’s motion. c) An object’s speed will _____________________ when a net force acts in the opposite direction of the objects motion. d) Unbalanced forces can cause an object to speed up, slow down or change_______________________________. _____2) A net force applied in the same direction as an object’s motion causes the objects to _____________________. a) speed up b) slow down _____3) A moving object that changes direction is being acted on by a(n) ______________________________. a) balanced force b) unbalanced force
