1. Forces Notes

2. A force can be a _____, a ____ or a _____.
Forces can change the _____, _____ or _________ of an object

3. A force can be a push, a pull or a twist.
Forces can change the speed, shape or direction of an object

4. Contact Forces Applied Force Friction Spring Force
Drag - Air or water resistance
Spring Force
Support (or reaction) Force
Tension Force

5. Non-contact Forces Gravity Force (or Weight) Magnetic Force
Electrical Force

6. Balanced Forces
How can I tell that the forces on an object are balanced?
Not moving
Constant speed
Not changing shape

7. Unbalanced forces
How can I tell that the forces on an object are unbalanced?
Changing speed
Acceleration or deceleration
Changing direction
Changing shape

8. Unbalanced Forces Poster
Hard copy or electronic.
Title "Unbalaced Forces"
Choose a situation with unbalanced forces e.g.: Sky diving,Bungy jump, Race Car, Tackle, Kicking a ball, Skateboarding, Sinking Rock
Find a picture to show the situation (online, from a magazine or hand drawn)
Draw and label arrows to show the unbalance forces acting on the object
Write a sentence that says how the unbalance forces are affecting the object (ie. changing speed, direction or shape)
Do a draft or plan of the poster for Miss Voss to check before doing the final copy. 

9. Unbalanced Forces Skydiving
The skydiver is accelerating towards the ground because the Force of gravity is greater than the force of air resistance.
Skydiving

10. Check for Understanding
For each diagram
Copy it
Label the force arrows
Are the forces balance or unbalanced
Describe what will happen to the speed of the object (same, faster, slower) and explain why.

11. Mass: Weight: How much matter (atoms) there is in something.
Measured in grams (g) or kilograms (kg)
Weight:
The force due to gravity that acts on something.
Measured in Newtons (N)

12. My Weight around the Universe
Earth
(sea level)
(top of Mt Everest)
Moon
Jupiter
My Mass (kg)
Force of gravity (N/kg) 10
9.8
1.66
3180
Weight
(N)

13. Density How heavy something is for its size
Density (g/cm3) =
Mass (g) ÷ Volume (cm3)
Mass (g)
Volume (cm3)
Density (g/cm3) =

14. Friction A force that resists surfaces sliding past each other
When friction is useful:
Tires on road
When is friction not useful:
Moving engine parts

15. Friction
Increase friction by:
Decrease friction by:

16. Friction Increase friction by: Decrease friction by:
Rough surfaces e.g. sand paper
‘Grippy’ surfaces e.g. rubber
Decrease friction by:
Lubrication e.g. oil, water, wax
Smooth surfaces
Wheels
Bearings
Streamlining e.g. cars and boats

17. Speed Speed is how fast an object is going.
Speed can is commonly measured in:
kilometres per hour (kph or km hr-1) or
metres per second (m/s or ms-1).
Speed can be calculated by dividing the distance travelled by the time it took:
Speed = distance/time

18. Tables an organised way to record data
Title that describes what the data is
Ruled columns and rows
Columns or rows labelled with quantity and unit

19. Line Graphs a good way to present experimental data to help see patterns
Title that describes what the data is
Rules axes
Axes labelled with quantity and unity
Axes numbered in even intervals
Plotted with ‘x’s