Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How is resultant force calculated?
   • A resultant Force is calculated when a number of Forces acting on an object is be replaced by a single Force that has the same effect as all the original Forces acting together.
2. What is the resultant force for an aeroplane accelerating with a force of 2300 N when the reaction force of air resistance is 1900 N.
   • What is the resultant Force for an aeroplane accelerating with a Force of 2300 N when the reaction Force of air resistance is 1900 N is 400 N.
3. What forces are acting on a car that is speeding up?
   • The Forces acting on a car that is speeding up are acceleration (thrust), air resistance (drag and friction), weight and reaction Force.
4. What is the resultant force for an object in each of the two examples below? 1) http://bit.ly/2EF4n0D 2) http://bit.ly/2BEpgGo
   • The resultant Force for example 1 is the object's weight and reaction Forces are balanced. Therefore the resultant Force is zero and the object travels at the same height. However, it is accelerating (thrust) as the vector is longer than the air resistance (drag and friction). The resultant Force for example 2 is weight as the reaction Force and the weight are unbalanced, where the vector for weight is longer.
5. What happens when two component forces at right angles act together?
   • When two component Forces at right angles act together they have the same effect as the single Force.