A student pushes a heavy box across a floor.
She pushes with a constant horizontal force of 120 N. The box moves 4.5 m in the direction of the force.
Use the equation: work done=force×distance\text{work done} = \text{force} \times \text{distance}work done=force×distance
Calculate the work done by the student.
Work done can also be given in newton-metres (N m\text{N m}N m).
Write down your answer to (a) in newton-metres.
The box moves at a constant speed.
Describe what happens to the energy transferred by the work the student does.
The student then pushes a smaller box with a force of 80 N. The box moves 250 cm.
Calculate the work done on the smaller box in joules.
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.