GRADE 11 - PHYSICAL SCIENCES Notes

The free-body diagram for the 1 kg block would include the following forces:

• Weight (
  $W_1 = mg = 1 kg \times 9.81 m/s^2 = 9.81 N$): Acting downward.
• Normal force (
  $N_1$): Acting perpendicular to the incline surface and opposing weight component acting down the incline.
• Frictional force (
  $F_f = 20 N$): Acting up the incline, opposing the motion.

Key Elements for Free-Body Diagram:

• Mark the angles, label all forces, and include the direction of each force.