Cw K 04 September 2021 Calculating Resultant forces

Cw. K 04 September 2021 Calculating Resultant forces using the Parallelogram method Do Now Activity Draw the following diagram to scale

Self Asses 1. Choose a scale 2. 2 cm= 10 N 3. Draw these lines with a 60 ° angle between them

Progress Indicators Good Progress Choose an appropriate scale to draw a scale force diagram. Measure acute angles. Outstanding Progress Calculate the resultant force of a diagonal line using your chosen scale.

Drawing a Scale Diagram to find the resultant force

Procedure 1. Choose a scale 2. Draw these lines with a 60 ° angle between them

Complete the parallelogram

Draw the diagonal from the point of application of the forces 1. The diagonal labelled R represents the resultant force 2. Measure the resultant force 3. What is the answer?

Draw the diagonal from the point of application of the forces 1. Measure the angle • The angle A = 230. • Thus, the resultant of the two original forces is a force of size ? acting at 230

Practice- Question 1 Find the resultant force acting on a car being pulled by two forces. Use the scale 1 cm = 1000 N Car 11500 N 45° 8000 N

Self Assess Car 45° 11. 5 cm 8 cm Resultant force is 1800 N 18 cm Direction is 18° southwest

Practice- Question 2 Find the resultant force on the rock by the two boys 66 N° 70° 99 N°

Plenary • List the stages of drawing the parallelogram method to find the resultant force and direction