1. Lesson Starter What is a force? Describe how a balanced force affects
a) a moving object b) a stationary object
Describe how an unbalanced force affects:

2. To learn how to measure a force using a spring
Learning Intention
To learn how to measure a force using a spring

3. Discuss..
Why is bottle B`s spring stretched more than bottle A`s spring?
What is pulling down the two bottles?

4. Investigate
Is there a link between the mass hanging from the spring and the length of its stretch?
1. Measure the length of the unstretched spring.
2. Either hold the spring or use a clamp stand to hold it.
3. Start by hanging the carrier on the spring. (The carrier has a mass of 100g)
4. Measure, with a ruler, the length of the stretch of the spring. Don’t forget to take away the length of the unstretched spring!

5. What are you investigating?
Aim
What are you investigating?
To find out if there is a link between the mass hanging on a spring and its stretch

6. Method
Write down step by step instructions as to how you carried out your experiment.
Draw a labelled diagram of how your experiment was set up

7. Results

8. Stretchy Springs Lab Report
Aim
Method (instructions + diagram)
Results (copy the table)
Graph (on graph paper)
Conclusion

9. Plotting Line Graphs: Rules
Always use a ruler
Always label your axis
Always use correct units
Always use an appropriate scale
Always plot your points accurately

10. Conclusion What did you find out?
What was the link between the mass hanging on a spring and its stretch

11. Use your graph to find out the mass of objects
Experiment
Use your graph to find out the mass of objects

12. Gravity Force of attraction Pull- keep you on the ground
Every object in the universe that has mass exerts a gravitational pull or force, on every other mass.
The size of the pull depends on the masses of the objects.
Weight is a force caused by gravity.
Weight of an object is the gravitational force between the object and the Earth.

13. Copy and complete
An object attached to the end of a spring will _________ it.
The bigger the mass of the __________ the ___________ the spring stretches.
The force that pulls on the object is called the force of _____________
This special force gives the object ___________
Weight is name given to the force of gravity _________ downward on the object