Acceleration, Sean Kingston Muzyka, Muzyka Gaga, Dokumenty prace
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Name _________________________________________ Class _______________ Date _________________
How does changing the mass of an object change its acceleration?
Prediction
1 I think that a trolley with a large mass will accelerate _______________________ (faster/slower) than a trolley with a small mass.
Apparatus
Catch the trolley before it hits
the pulley at the end of the ramp. Put the box of crumpled newspaper beneath the weights so they do not fall on your feet.
• ramp • pulley
• blocks • stopclock
• trolley • sticky tape
• string • a box of crumpled
• 50g hanging mass newspaper
• 100g masses
Method
A Fasten the pulley to one end of
your ramp and place it near the end
of the bench.
B Put some blocks under the other
end of the ramp.
C Push the trolley gently. If it slows
down and stops, add another block
under the end of the ramp. If it
speeds up, take a block away. You
need to adjust the slope of the ramp so that the trolley just keeps moving.
D Fasten the string to the trolley, run it over the pulley and fasten the 50g hanging mass to the other end.
E Put 500g of masses on the trolley. You may need to use sticky tape to hold them on.
F Let the mass on the string accelerate the trolley along the ramp. Time how long it takes to move along the ramp and write the time in the results table.
G Repeat step F twice more.
H Add another 500g to the trolley and repeat steps F and G. Carry on adding masses and timing the trolley until you have completed the table.
I Find the mean by adding up the three results and then dividing by 3.
9Kc(2)
Investigating acceleration 1
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Recording your results
Mass on trolley (g)
Time to run along ramp (s)
Mean time to run along ramp (s)
1st run
2nd run
3rd run
500
1000
1500
2000
2500
Considering your results/conclusions
2 I set up the ramp with a slope so that the force of _______________________ cancelled out the effect of _______________________ on the trolley.
3 My results show that it takes _______________________ (more/less) time for a trolley with a large mass to travel along the ramp. This means that a trolley with a large mass is accelerating _______________________ (faster/slower) than a trolley with a small mass.
Evaluation
4 Explain why timing the trolley three times with each mass can give you more reliable results.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
5 a Describe a way in which you could improve your experiment.
_________________________________________________________________________
_________________________________________________________________________
b Why would this be an improvement?
_________________________________________________________________________
_________________________________________________________________________
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