physics speeding up revision made from nzqa questions- ncea level1?
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| In the first three seconds Mary’s acceleration is constant. Use the slope of the graph to calculate its size in meters per second squared. | Slope of graph gives acceleration.
Hence:
a = 30ms-1/3s = 10 ms-2
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| to find time you? | distance/speed
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| to find speed you? | distance/time
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| to find distance you? | time x speed
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| Using Newton’s Second Law, explain why the sky diver must have no net force acting on her when she is falling at a constant velocity? | The net force on her is zero Newtons at
her constant terminal velocity because
she has no net acceleration. Hence by
Newton’s second law, if anet = 0, then Fnet
= m anet = 0 N.
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| Mary has a mass of 65 kg. Calculate the size of the force of gravity acting on her as she falls. | F = mg = 65kg x 10 N/kg = 650 N
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| terminal velocity | -drag and weight balanced
-no accelerations; a=0
-at fastest possible speed
-constant speed
-zero change in speed, zero slope, zero acceleration
-F=m,a. if a=0 f=0; weight less
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| at slope= | ------- as constant acceleration
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| vt slope= | acceleration/changing speed; no slope no acceleration= constant speed
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| dt slope= | speed/velocity, more slope speed; no slope no acceleration = constant speed
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