Newton's second law in a straight lineEdexcel A-Level Maths: Mind map

Exam questions on Newton's second law in a straight line

1. A sledge of mass $40$ kg is pulled from rest along horizontal ground by a horizontal rope. The tension in the rope is $100$ N and the resistance to motion is a constant $20$ N. Model the sledge as a particle.
   Find the distance travelled by the sledge in these $6$ s.2 marks
2. A particle $P$ of mass $2$ kg is acted on by two forces only, $\mathbf{F}_1=(6\mathbf{i}-4\mathbf{j})$ N and $\mathbf{F}_2=(2\mathbf{i}+8\mathbf{j})$ N, where $\mathbf{i}$ and $\mathbf{j}$ are perpendicular unit vectors.
   Find the magnitude of the acceleration of $P$.2 marks
3. A lorry of mass $8000$ kg travels along a straight horizontal road. The resistance to the lorry's motion is a constant $1200$ N. Model the lorry as a particle.
   The driving force of the lorry's engine is $6400$ N. Find the acceleration of the lorry.3 marks