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 3.0 m uniform beam AB, pivoted 1.0 m from the end A. The weight of the beam is 200 N .
Question Image
Copy the diagram and mark the beam's centre of mass.

HARD
Upper Secondary: IGCSE
IMPORTANT

The diagram shows a 3.0 m uniform beam AB, pivoted 1.0 m from the end A. The weight of the beam is 200 N .
Question Image
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 3.0 m uniform beam AB, pivoted 1.0 m from the end A. The weight of the beam is 200 N .
Question Image
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 3.0 m uniform beam AB, pivoted 1.0 m from the end A. The weight of the beam is 200 N .
Question Image
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 30 N and length 1.40 m. The bar is being used to lift one edge of a concrete slab S . A stone, placed 0.20 m from one end of B, acts as a pivot.
Question Image
A force of 40 N 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 30 N and length 1.40 m. The bar is being used to lift one edge of a concrete slab S . A stone, placed 0.20 m from one end of B, acts as a pivot.
Question Image
A force of 40 N 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 30 N and length 1.40 m. The bar is being used to lift one edge of a concrete slab S.  A stone, placed 0.20 m from one end of B, acts as pivot. A force of 40 N 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.
Question Image
HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a uniform iron bar B of weight 30 N and length 1.40 m. The bar is being used to lift one edge of a concrete slab S . A stone, placed 0.20 m from one end of B, acts as pivot.
Question Image
A force of 40 N 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.