MOMEN GAYA MOMEN INERSIA

1. Turning Effect of Forces

2. Induction Activity
hand
long ruler
hand
pivot
turning
effect

3. Induction Activity
Can you open the door?
pivot
turning
effect

4. Turning effect of Forces
Which wrench
would you choose
to unscrew the
stubborn bolt?

5. F
Line of action of
the force
d
Pivot
F-Applied Force
d-Perpendicular
Distance from the
pivot to the line of
force
Turning effect of Forces
Moment of a Force (Torque) = F x d┴ (Nm)
Work Done = F x d// (J)

6. Turning effect of Forces
Which wrench
would you choose
to unscrew the
stubborn bolt?
d1
d2

7. Turning effect of Forces
Top View
Hinge (Pivot) d
d’
Hinge (Pivot)
d1
F1
F2
d2

8. Turning effect of Forces
Which direction
would you choose
to turn the
wrench?
1
2
3
4
5
6

9. Clockwise &
Anticlockwise Moment

10. Principle of Moments
How does a crane keep its balance?

11. Principle of Moments
Pair work Investigative Activity
Get the necessary
apparatus.
You have 15 min to
complete the
worksheet.
Share your findings
with the class
afterwards.

12. Principle of Moments
For a body at equilibrium about a pivot, the
principle of moments states that:
Sum of clockwise
moments about
the pivot
= Sum of anti-clockwise
moments about the pivot

13. Principle of Moments

14. Closure
Reflect on today’s lesson and write
down one important thing you have
learnt. Share with the class.

15. Closure
Turning Effect of Forces: daily applications
Moments = F x d (Nm)
Clockwise Moment Anticlockwise Moment
Principles of Moments