HARD
Upper Secondary: IGCSE
IMPORTANT
Earn 100
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?
When the force F is applied, what is the value of the contact force that the pivot exerts on the beam?
Important Questions on Turning Effects of Forces
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.
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.
Suggest a change to the arrangement in the diagram that would reduce the force required to lift the slab.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a mobile bird sculpture that has been created by an artist.
Where M is the centre of mass of the bird sculpture. Including its tail (but not including the counter-weight that will be added later). The mass of the bird and tail is . The bird sculpture is placed on a pivot. The artist adds the counter-weight at the end E of the tail so that the bird remains stationary in the position shown. Calculate the mass of the counter-weight.
HARD
Upper Secondary: IGCSE
IMPORTANT
The diagram shows a mobile bird sculpture that has been created by an artist.
M is the centre of mass of the bird sculpture. including its tail ( but not including the counter-weight that will be added later). The mass of the bird and tail is 1.5kg. The bird sculpture is placed on a pivot. The artist adds the counter-weight at the end E of the tail so that the bird remains stationary in the position shown. The center of mass of the sculpture with counter-weight is at the pivot. Calculate the upward force acting at the pivot.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
The sculpture is rotated clockwise to the position shown in the diagram. It is held still, then carefully released.
State whether the sculpture will stay in that position, rotate further clock wise or rotate back anticlockwise.
