IQWST Assessment – Flashcards
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Forces
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All forces come in pairs (in opposite directions)
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Two objects that touch..
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Every two objects that touch apply a contact force to each other
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Beginning of motion
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The beginning of motion is always caused by forces
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Object's motion is influenced..
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An object's motion is influence only by the forces that are applied to it,not by the forces it applies to others
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Forces that are applied to an object in opposite directions..
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Counteract each other
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Forces that are applied to an object in the same direction..
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Reinforce one another
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Net force
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Combine all forces
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If forces act in opposite, equal directions... if forces act in opposite directions then ______ to find net force.
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They cancel each other out...subtract
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Two forces acting on the same object in the same direction a
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Added together to determine net force
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Explain why objects begin to move
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A force is applied to the objects, setting them in motion
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Horizontal and vertical forces
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Many cases horizontal causes motion
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When do two forces that are applied to an object counteract each other?
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Forces come in opposite directions, same object
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When do two forces that are applied to an object reinforce each other?
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come in the same direction, same object
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When do two forces that are applied to an object cancel each other?
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When they are equally strong, opposite direction, same object
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An object applies forces to several other things around it. Do these forces influence the object's motion?
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No, motion is only influenced by the forces applied to it, not by the forces it applies to others
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For something to move upwards, it has to overcome what force
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Gravitational
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Under what conditions do forces counteract each other?
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Acting in opposite directions, acting on the same object
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Under what conditions do forces reinforce each other?
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Acting in the same direction, acting on the same object
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Under what conditions do forces cancel each other?
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Equal strenght, opposite directions, same object
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Grams are used to measure...
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Mass (g)
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Newtons are used to measure...
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Weight (N)
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Does a spring get stretched by the same amount each time the same mass is hung frrom it?
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Yes
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Does a spring return to its original shape each time after the mass hanging from it is removed?
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Yes, returned to zero
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What is the relation between the amount a spring gets stretched and the size of the mass hanging from it?
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Greater spring gets stretched, greater mass
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How can you tell the size of the mass hanging from it?
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Greater the mass, spring gets stretched more
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How to covet mass to wight
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Divide by 100
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How to convert weight to mass
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Multiply by 100
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Mass
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Measure of the amount of matter in an object
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Weight
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Force that acts on an object due to gravity
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Don't forget what??
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LABELS - units are important (g for grams or N for newtons)
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Two contact forces with regards to their directions and magnitudes
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Two forces are equal in magnitude in opposite directions
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What general relationship do you think there is between pairs of forces?
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For every force, there is an equal and opposite force
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Friction
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Comes in pairs that act in opposite directions, act in the parallel to the contact surface rather than perpendicular
