Question 3
FA book rests on a table.
The Figure shows two of the forces acting on the book.
Figure
a.[1]
State Newton's third law.
b.[2]
A student says:
'The weight of the book and the normal contact force from the table are a Newton's third law pair, because they are equal in size and act in opposite directions.'
Explain why the student is wrong.
c.[2]
The weight of the book is the gravitational force of the Earth on the book.
Describe the force that forms a Newton's third law pair with the weight of the book.
2.2 Newton’s laws Questions
50 exam-style questions on OCR GCSE Physics 2.2 Newton’s laws, covering 2.2.1 Interactions between objects, 2.2.2 Force pairs in interactions, 2.2.3 Forces as vectors, 2.2.4 Newton's first law, 2.2.5 Resolving forces with vector diagrams, 2.2.6 Forces acting on an isolated object, 2.2.7 Free body diagrams and resultant force, 2.2.8 Free body diagrams for balanced forces, 2.2.9 Newton's second law, 2.2.10 Inertia and inertial mass, 2.2.11 Momentum in collisions, 2.2.12 Relating force, mass, velocity and acceleration, 2.2.13 Work done by a force, 2.2.14 Work, stored energy and units of energy, 2.2.15 Power as the rate of energy transfer, 2.2.16 Newton's third law, and 2.2.17 Circular motion and changing velocity. Each one has a worked solution and a mark scheme showing where the marks go.