Page 3 - Class VII Worksheets Forces and Energy

SUBTOPIC: 3.3 Describing movement & 3.4 Turning effect

Sl. No. QUESTIONS
1. Which of these objects do not needs a turning force to work?

(a) (b) (c) (d)

2. If a distance-time graph is a straight line parallel to the time axis, what does it indicate about
the object's motion?
a) The object is at rest
b) The object is moving with constant speed
c) The object is accelerating
d) The object is moving with variable speed
3. The drawing shows a bicycle brake lever. A moment of 1.8 Nm is needed to turn this brake
lever. Calculate the force needed at position F to produce a moment of 1.8 N m.

4. Sameer goes to the football ground to play
football. The distance-time graph of his
journey from his home to the ground is given
as figure.

a) What does the graph between points B
and C indicate about the motion of
Sameer?
b) Is the speed between time 0 to 8
minute constant or not-constant?
c) What is his speed between 8 and 12
minutes of his journey, include units in
answer?
d) Calculate the average speed of Sameer for the complete journey, include units in
answer?
5. The Diagram shows a seesaw with two boys on it. To decide whether the seesaw is balanced,
you need to calculate moment of each force. Is it balance? Show your working in the answer
sheet.

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