1. Balanced forces To know that in stationary objects forces are balanced To know that the direction of a force can be shown as an arrow To know that force arrows can be scaled to show the size of the force

3. 60N

4. 100N

5. What do we mean by a balanced force?

6. Why does the swan float? Upthrust Weight

7. If the forces are unbalanced….. Upthrust Weight

8. Key points about forces When objects are stationary forces are opposite and balanced When objects are speeding up or slowing down forces are not balanced When an object is moving and the forces are balanced speed will remain constant Forces can be represented by arrows.  The size of the arrow indicates the size of the force The size of the difference between the two opposing unbalanced forces is called the resultant force

9. Balanced and unbalanced forces 1) This animal is either ________ or moving with _______ _____… 4) This animal is also either _______ or moving with ________ ______.. 2) This animal is getting ________… 3) This animal is getting _______…. Words - Stationary, faster, slower or constant speed?

10. Answer the following questions in full sentences. Use diagrams to help you. 1. Use the key words from today to explain how a car speeds up. 2. Use the key words from today to explain how a bus would slow down. 3. Sarah is using a rope to lift a 15N weight. She pulls with a force of 20N. Will she be able to lift it? What is the resultant force?

11. One final question 1. What is the resultant force? Are the forces balanced or unbalanced? 2. The rocket applies an additional force of 10N. What is the resultant force?