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forces (terminal velocity (terminal velocity depends on shape and area…
forces
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calculating forces
scale drawings
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then draw straight line from start of first force to the end of last force -resultant force (PHYTHAG THEOREM)
measure the length of resultant force to find the magnitude, angle and direction of force
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forces and elasticity
stretching, compressing, bending transfers energy
when you apply a force to an object it may bend, compress or stretch
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an object is elastically deformed if it can go back to its original shape after force has been removed
an object is in elastically deformed if it doesn't return to its original shape or length after force is removed
work is done when a force stretches/compresses an object and causes energy to be transferred to elastic potential energy store of object- if elastically deformed all energy will got to epe store
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moments
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levers
levers increase distance from pivot at which force is applied. this means less force is needed for same moment
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distance, displacement, speed, velocity
distance is scalar, displacement is vector
distance is how far an object has moved, no direction
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speed and velocity
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this means that an object can travel at constant speed but changing velocity -object changes direction at same speed
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typical speeds
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can change due to factors (age, fitness, temp, terrain
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