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24 Cards in this Set
- Front
- Back
A _____ is a push or pull that one object exerts on another during an interaction between them. In contact push/pull interactions a _____ is only present during the period that the interacting objects are actually in contact with each other. As soon as contact is lost, the associated ____ ceases to exist.
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Force
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Forces are not transferred between interacting objects as _____ is
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Energy
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When a combination of forces acts on an object, a single equivalent force can always be found that would have exactly the same effect on the object’s motion. This equivalent force is known as the ____ and is found by adding strengths of all the forces acting in one direction and subtracting the strengths of all the forces acting in the opposite direction.
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Net Force
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When the forces are exactly balanced the net force is ____
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Zero
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When the forces acting on an object are unbalanced (which includes the case of a single force), what will happen?
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its speed will change
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If an object is already moving, its speed will ____ if the net force is unbalanced and in the same direction as its motion, and_____ if the net force is in the opposite direction to its motion.
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Increase ; decrease
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If the forces acting on an object are balanced,what will happen?
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Its speed will stay constant
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A balance force applies to an object ___
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at rest
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The rate at which its speed will change is related to the net force strength acting on it and the object’s mass by what relationship?
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Rate of change of speed = Mass of an Object / Strength of Net force
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If object A exerts a force on object B, then object B exerts ....
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a force back on object A in the opposite direction.
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The motion of an object can be represented on a
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speed-time graph
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A horizontal straight line on a speed-time graph indicates the object is moving at a
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constant speed
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On a speed-time graph, An _____ straight line indicates the object is speeding up. A _____ straight line indicates the object is slowing down.
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upward-sloped ; downward-sloped
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The steeper the slope of the line on the speed-time graph, the ....
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the greater is the rate of change in speed.
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The behavior of the strength of a particular force acting on an object, or the net force acting on it, can be represented on a _____
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Force - time graph
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on a force- time graph , a horizontal straight line indicates that the force ____
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has a constant strength
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On a force-time graph , horizontal straight-line segments at different values indicate a change in _____
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force strength from one constant value to another.
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A horizontal straight line on a force-time graph at zero indicates ___(or balanced forces in the case that the graph is showing net force strength.)
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no force
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_____ represents the forces acting on an object, and gives an indication of its motion, at a particular instant in time.
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A force diagram
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Forces are represented with ____ that point toward (pushes) or away from (pulls) the object itself.
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arrows
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The _____ of theses arrows is chosen to represent the relative strengths of each particular force and the ____ of the arrows represents the direction the force is applied.
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length ; direction
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Each force arrow is ____ to indicate how the force is exerted and its strength shown when known
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labeled
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If the object in question is in motion at the moment at which the force diagram is drawn, this is indicated with a _____; a half-arrow drawn close to the object (usually above for horizontal motion).
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speed arrow
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The ____ of the speed arrow represents the direction of motion and its _____ may be used to indicate relative speed, when comparisons of speeds (either of different objects, or different moments in time) are made.
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direction ; length
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