HARD
Upper Secondary: IGCSE
IMPORTANT
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Write out step-by-step instructions for an experiment to find the position of the centre of mass of a plane lamina.

Important Questions on Turning Effects of Forces
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform beam AB, pivoted from the end A. The weight of the beam is .
Copy the diagram and mark the beam's centre of mass.

HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform beam AB, pivoted from the end A. The weight of the beam is .
Add arrows to show the following forces: the weight of the beam; the contact forces on the beam at the pivot.

MEDIUM
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform beam AB, pivoted from the end A. The weight of the beam is .
A third force F presses down on the beam (at endpoint A). What value of F is needed to balance the beam?

HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform beam AB, pivoted from the end A. The weight of the beam is .
When the force F is applied, what is the value of the contact force that the pivot exerts on the beam?

MEDIUM
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform iron bar B of weight and length . The bar is being used to lift one edge of a concrete slab S . A stone, placed from one end of B, acts as a pivot.

A force of pushing down at the other end of B is just enough to lift the slab and hold it as shown.
Copy the diagram and draw an arrow to show the weight of bar B acting from its centre of mass.

HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform iron bar B of weight and length . The bar is being used to lift one edge of a concrete slab S . A stone, placed from one end of B, acts as a pivot.

A force of pushing down at the other end of B is just enough to lift the slab and hold it as shown.
State the distance d of the centre of the mass of bar B from the pivot.

HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform iron bar B of weight and length . The bar is being used to lift one edge of a concrete slab S. A stone, placed from one end of B, acts as pivot. A force of pushing down at the other end of B is just enough to lift the slab and hold it as shown. Calculate the total clockwise moment, about the pivot, of the forces acting on bar B.
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HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform iron bar B of weight and length . The bar is being used to lift one edge of a concrete slab S . A stone, placed from one end of B, acts as pivot.
A force of pushing down at the other end of B is just enough to lift the slab and hold it as shown.
Calculate the downward force which slab S exerts on the end of bar B.
