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# Force Grade 8

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Force

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### Force Grade 8

1. 1. WELCOME! to our lesson of the day… Let us explore!!!!!!!! 8 7 6 5 4 3 2 1 PAGES
2. 2. Objectives of the Lesson Identify the forces acting on an object. Explain the effect of balance and unbalanced forces on the state of motion of an object. 8 7 6 5 4 3 2 1 PAGES
3. 3. I have questions…. What makes the objects move the way they do? Why do objects move in different ways? Why are some faster than the others? What makes the objects stay in place? 8 7 6 5 4 3 2 1 PAGES
4. 4. . • Will this ball move by itself?• How can we make this object move?• How can we make this object move? • When it is moving, how can we make it speed up or slow down? • How can we make it change its direction? Consider this ball…. 8 7 6 5 4 3 2 1 PAGES
5. 5. Let us do some activities…!!! 8 7 6 5 4 3 2 1 PAGES
6. 6. What do you think pulls the book and the pen down? Pen Book Line of Action Tension Force (FT) Normal Force (Fn) Force of Gravity (Fg) What makes the pen and book stay at rest?How do lengths of the arrows in each case compare? Balance Force – forces acting on object are equal in magnitude and in opposite directions and they lie along the same line of action. 8 7 6 5 4 3 2 1 PAGES
7. 7. . Due to unbalanced force, the object change its state of motion 8 7 6 5 4 3 2 1 PAGES
8. 8. Fn = 6 units Fg = 6 units Fnet = Fn + Fg = 6 units + (-6 units) = 0 Fn = 10 units Fg = 6 units Fnet = Fn + Fg = 10 units + (-6 units) = 4 units If the sum of the forces equate to zero, they are considered balanced. If the algebraic sum is not equal to zero, the forces are unbalanced. 8 7 6 5 4 3 2 1 PAGES