equal forces acting in opposite directions |
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balanced forces |
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occurs when an object's velocity decreases |
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negative acceleration |
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sum of all forces acting on an object |
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net force |
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total distance divided by total time |
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average speed |
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name for the slant of a line on a graph |
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slope |
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distance divided by time |
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speed |
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a push or pull exerted on a body or object |
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force |
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distance and direction of an object from its starting point |
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displacement |
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tendency to resist change in motion |
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Inertia |
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measure of how far and object has moved |
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distance |
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speed and direction of motion |
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velocity |
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rate of change of position at a specific point in time |
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Instantaneous speed |
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the rate of change in velocity |
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acceleration |
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compare and contrast: distance and displacement |
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both are links; displacement is direction and distance; distance is how far you have moved |
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compare and contrast: speed and velocity |
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both meters per second: speed is distance and velocity is speed and direction |
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explain the difference between positive and negative acceleration |
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positive is speeding up
negative is slowing down |
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how are force and motion related?- |
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both take unbalanced force to cause motion |
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what property of matter is inertia related to? |
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mass |
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a car travels west for 240 kilometers in 4 hours. What is the car's velocity? |
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60 kilometers per hour west |
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an object goes from a speed of 9 m/s to a total stop in 3 sec.what is the object's velocity? |
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-3 |
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explain what causes an unrestrained passenger in a car to fly forward when the car stops suddenly |
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inertia |
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the amount of matter in an object |
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mass |
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the net force acting on an object is zero |
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blanced forces |
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the speed of an object and the direction of its motion |
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velocity |
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the sum of all the forces acting on an object |
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net force |
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rate of change of the velocity of an object |
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acceleration |
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a measure of how far an object has moved |
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distance |
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the rate of change in position at a given point in time |
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instantaneous speed |
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the distance and direction an object moves from its starting point |
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displacement |
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the total distance an object travels divided by the time of travel |
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average speed |
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the rate of change of an object's position |
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speed |
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unequal forces pushing in opposite direction |
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unbalanced forces |
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any change over time |
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rate |
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an object that is neither speeding up or slowing down travels at a________. |
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constant speed |
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a graph with distance on a vertical axis and time on a horizontal axis |
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distance-time graph |
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when an object is accelerating, its speed is_______. |
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changing |
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state newton's first law |
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an object at rest will remain at rest until an unbalanced force acts on it |
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if the net force acting on a body is zero, will the velocity be zero? |
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no the velocity is constant, the object will not change its motion |
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will all forces cause an object to accelerate? |
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no only an unbalenced force |
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another name for newton's first law of motion |
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inertia |
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an object slowing down has a_______ acceleration |
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negative |
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the velocity of an object must have both a______ and a _________ |
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speed; direction |
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the equation s=d/t is used to calculate the_____ of an object |
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speed |
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in terms of positive, negative, and zero exceleration, how would you describe the motion of a student moving in a cafeteria lunch line |
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stand still- zero
forward- positive
backwards- negative |
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explain why the second hands of a clock cannot travels at constant velocities |
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they are changing direction |
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can the velocity of a car change when it's acceleration is constant? explain why or why not |
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yes the direction is always changing |
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a car approaching a red traffic light has a_________ acceleration; when the light turns green, the car's acceleration is ____ |
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negative; positive |
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in the equation s=d/t, d stands for______ |
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distance |
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in the equation used to calculate acceleration, Vi stands for _______ and Vf stands for______ |
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initial;final |
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if the acceleration of a skateboarder is ___, the sakteboarder may be soon coming to a stop |
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negative |
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a net __ is necessary for an object to chanege its motion |
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unbalanced |
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a freight train has more__ than a care, so it has great inertia |
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mass |
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if two people push on an object beween them with equal force but in opposing directions, the net force is __? |
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zero |
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