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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.
Force
Forces are not transferred between interacting objects as _____ is
Energy
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.
Net Force
When the forces are exactly balanced the net force is ____
Zero
When the forces acting on an object are unbalanced (which includes the case of a single force), what will happen?
its speed will change
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.
Increase ; decrease
If the forces acting on an object are balanced,what will happen?
Its speed will stay constant
A balance force applies to an object ___
at rest
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?
Rate of change of speed = Mass of an Object / Strength of Net force
If object A exerts a force on object B, then object B exerts ....
a force back on object A in the opposite direction.
The motion of an object can be represented on a
speed-time graph
A horizontal straight line on a speed-time graph indicates the object is moving at a
constant speed
On a speed-time graph, An _____ straight line indicates the object is speeding up. A _____ straight line indicates the object is slowing down.
upward-sloped ; downward-sloped
The steeper the slope of the line on the speed-time graph, the ....
the greater is the rate of change in speed.
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 _____
Force - time graph
on a force- time graph , a horizontal straight line indicates that the force ____
has a constant strength
On a force-time graph , horizontal straight-line segments at different values indicate a change in _____
force strength from one constant value to another.
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.)
no force
_____ represents the forces acting on an object, and gives an indication of its motion, at a particular instant in time.
A force diagram
Forces are represented with ____ that point toward (pushes) or away from (pulls) the object itself.
arrows
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.
length ; direction
Each force arrow is ____ to indicate how the force is exerted and its strength shown when known
labeled
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).
speed arrow
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.
direction ; length