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3.1-3.4 (G7)
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adjustments made in experiments to reduce the risk of accident or risk of injury.
safety precautions
in the context of a graph, sketch means to show the shape of the graph
sketch
not moving
at rest
not moving
stationary
type of graph in which the distance moved by an object is displayed on the vertical axis and the time elapsed is on the horizontal axis
distance/time graph
not changing; the word uniform is also used for constant
constant
calculated by dividing distance travelled by time taken; as actual speed may vary during the journey, the result of the calculation is an average value for the speed
average speed
use a mathematical process to derive an answer
calculate
distance travelled per unit time
speed
an object moves in a curved path or at angle to its original movement
change direction
get faster, accelerate or increase in speed
speed up
get slower, decelerate or reduce in speed
slow down
forces acting on an object are unbalanced if the effects of the forces do not cancel
unbalanced
the path of movement of an object or the line along which a force acts
direction
direction of two forces is opposite if the angle between the forces is 180 degree celsius
opposite
forces acting on an object are balanced if the sizes of the forces are equal and they are in opposite direction
balanced
an action that if unbalanced will change the direction of movement of an object or will change the shape of an object
force
the standard unit of moment; other units of moment include N/cm and N/mm
newton metre (Nm)
turning effect of a force, calculated as the force multiplied by the distance of the force from the pivot.
moment
the point about which a lever turns
pivot
a rigid bar that pivots on a fixed support
lever
rotate around an axis or change direction
turn
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