# P1.3-KS3

1.3 Squashing and stretching

Worksheet

Worksheet ANS

Investigation

Friction.mov

Marshmallow.mp4

Squashing

Tugowar.mp4

Tension

# Practical

1.2 Squashing and stretching

Class:

• Marshmallows (1 each)
• Feltip pen to draw on marshmallow

Hookes law -

• Elastic band
• Masses
• Rulers
• Right angled triangle rulers
• Meter sticks

Students using marshmallows to see deformations.

Introduce how an object will have a normal force.

Risk assessment:

• No risk

Risk assessment:

• Safety classes
• masses dropping onto floor.
• elastic bands snapping

# Target:

• State an example of a force deforming an object

• Recognise a support force

• Use Hooke’s Law to identify proportional stretching

• Present data in a line graph and identify a pattern

• Describe how forces deform objects

• Explain how solid surfaces provide a support force

• Use Hooke’s Law to predict the extension of a spring

• Present data on a graph, and identify a quantitative relationship in the pattern

• Explain how forces deform objects in a range of situations

• Explain how solid surfaces provide a support force, using scientific terminology and bonding

• Apply Hooke’s Law to make quantitative predictions with unfamiliar materials

• Present data in a graph and recognise quantitative patterns and errors