Chapter 3 Vocabulary

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Chapter 3 Vocabulary 1. Acceleration - Rate of change of velocity; can be calculated by dividing the change in the velocity by the time it takes the change to occur. 2. Air Resistance - Force that opposes the motion of objects that move through the air. 3. Average Speed - Total distance an object travels divided by the total time it takes to travel that distance. 4. Balanced Forces - Forces on a object that combine to give a zero net force and do not change the motion of the object. 5. Displacement - Distance and direction of an object's change in position from the starting point. 6. Distance – How far an object moves. 7. Force – A push or pull exerted on an object. 8. Friction – A force that opposes the sliding motion between objects that are in contact. 9. Instantaneous Speed – The speed of an object at a given point in time; is constant for an object moving with constant speed, and changes with time for an object that is slowing down or speeding up. 10. Net Force – Sum of the forces that are acting on an object. 11. Sliding Friction – Frictional force that opposes the motion of two surfaces sliding past each other. 1

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12. Speed – Distance an object travels per unit of time. 13. Static Friction - Frictional force that prevents two surfaces from sliding past each other. 14. Unbalanced Forces – Forces that combine to produce a net force that is not equal to zero and cause the velocity of an object to change. 15. Velocity – The speed and direction of a moving object.

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