Question 2
FTwo children, A and B, sit on a seesaw.
The Figure shows the seesaw. It is balanced.
Figure
a.[3]
Use the equation: moment of a force=force×distance\text{moment of a force} = \text{force} \times \text{distance}moment of a force=force×distance
Calculate the moment of child A's weight about the pivot. Give the unit.
b.[1]
The weight of child A causes an anticlockwise moment about the pivot.
State the direction of the moment caused by the weight of child B.
c.[2]
The seesaw is balanced.
Calculate distance d.
d.[2]
Child B moves further away from the pivot.
Describe what happens to the seesaw. Give a reason for your answer.
2.3 Forces in action Questions
46 exam-style questions on OCR GCSE Physics 2.3 Forces in action, covering 2.3.1 Stretching, bending and compressing, 2.3.2 Elastic and plastic deformation, 2.3.3 Force and extension of a spring, 2.3.4 Linear and non-linear force-extension behaviour, 2.3.5 The spring constant, 2.3.6 Work done in stretching, 2.3.7 Gravitational fields, 2.3.8 Weight and gravitational field strength, 2.3.9 Acceleration in free fall, 2.3.10 Relating force, mass and gravitational field strength, 2.3.11 Forces causing rotation, 2.3.12 The moment of a force, 2.3.13 Levers and gears, 2.3.14 Pressure in fluids, and 2.3.15 Pressure, force and contact area. Each one has a worked solution and a mark scheme showing where the marks go.