1. How do forces act vertically on objects?
Vertical Forces
How do forces act vertically on objects?
Starter: Draw a tennis ball falling and a tennis ball on a table. Label the forces acting on the 2 balls.

2. But how does the table put a force on the balls? :s
There is a reaction force from the table acting on the balls. Are the 2 forces balanced or unbalanced ?

3. Forces in Explosions http://www.youtube.com/watch?v=0Y14kEY-6fk
Draw an explosion. E.g. a firework
Why have you drawn it that way?
Why do we get that shape?
Gun recoil
Explain that when two objects explode apart they both experience a force .
Show how the motion of rockets and jet engines is caused by an interaction pair

4. What forces are acting on this cannon
Gun Recoil
show how the motion of rockets and jet engines is caused by an interaction pair

5. How does this great hunk of metal float?!

6. Competition Time
In pairs make a boat out of metal, that can float on water.
Draw a diagram to show the “contact forces” which are interacting.
explain that horizontal surfaces exert an upwards force on objects sitting on them – the reaction of a surface

7. Remember: 1kg = 1000g Mass (kg) Weight (N)
Lets Investigate : What is the relationship between mass (in kg) and weight (in N)?
Remember: 1kg = 1000g
Mass (kg)
Weight (N)

8. strength of gravity (N/kg)
Weight(N) = mass(kg) x
strength of gravity (N/kg)
What is the strength of gravity on Earth?
* Remember that a bag of sugar has a mass of 1kg and a weight of 10N *

9. Complete the task in red and then choose one of the other tasks.
ALL: write a revision card and complete the PP questions.
Draw and fully label 5 examples of situations where forces are used e.g. a car accelerating, a car moving at a constant speed.
Complete the worksheet on resultant forces
HIGHER ONLY Extension complete the misconceptions worksheet. (A/ A*)
Create a revision poster (for you) about resultant forces.
What effect does an overall (resultant) force have on an object?

10. Plenary
Past paper Question and revision card