NPS International School
Name: Subject: Physics Grade: 7 Date:
Answer these questions.
1) Read the graph given and understand the journey of Emma. The
stages of her journey have been marked as 1 to 5. Answer the
following questions.
a) What
was
Emma’s speed during stage 1. Always write the formula,
substitute the values and show working. You can give the answer
in km/minute.
Emma’s speed :
__________________km/minute
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NPS International School
b) The graph shows two stages when Emma was stationary. Identify
those stages and write their numbers.
___________________________________________________________________
c) Compare the slope of the graph in stages 1 and 4. Can you tell in
which stage was her speed greater by just looking at the graph?
___________________________________________________________________
d) Calculate Emma’s speed in stage 4 in km/minute. Check if your
answer to question (c) was correct.
Speed:
_____________ km/minute
e) What is the total distance covered by Emma in the entire
journey?
__________________________________________________________________
f) Calculate her average speed in km/h (Include stage 5 in your
calculations).
Average speed :
_________________ km/h
2) A car of mass 600 kg accelerated from 15 m/s to 25 m/s in 5
seconds.
a. Calculate the acceleration of the car.
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NPS International School
Acceleration:
________________
b. Calculate the force needed to cause this acceleration.
Force:
_______________
c. The engine force from the car must need to be greater than the
value calculated in question (b). Explain why this is so.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
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