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Squashing and Stretching Yr 8 Forces
Squashing and Stretching
Year 8 Forces
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Slide 1:
Diapositive
Physics
Lower Secondary (Key Stage 3)
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Squashing and Stretching
Year 8 Forces
Slide 1 - Diapositive
(How far it stretches)
Slide 2 - Diapositive
Deformation is when an object changes _______ due to forces
A
Density
B
Temperature
C
Mass
D
Shape
Slide 3 - Quiz
Hooke's law - if you double the force on a spring the extension doubles. Is a ________ relationship
A
Doubled
B
Linear
C
Negative
D
Trend
Slide 4 - Quiz
Extension is how far an object.....
A
Springs
B
Stretches
C
Recoils
D
Shapes
Slide 5 - Quiz
When a spring is permanently deformed we call this
A
Elastic limit
B
Elastic potential
Slide 6 - Quiz
(Extension = the change in length )
Slide 7 - Diapositive
What can happen to an object when multiple forces act upon it?
Slide 8 - Question ouverte
What happens to the strong bonds between particles in a solid when deformation occurs?
A
They are broken
B
They are stronger
C
They are squashed
D
They are stretched
Slide 9 - Quiz
When the bonds are squashed it is called...
A
Compression
B
Extension
Slide 10 - Quiz
When the bonds are stretched it is called...
A
Compression
B
Extension
Slide 11 - Quiz
What is an example of the 'normal reaction force'
A
When a chair pushes back against you sitting
B
When you crush a monster can
C
When you pull a light cord
D
When you jump over a hurdle
Slide 12 - Quiz
Forces can be divided into 5 types.
Compression
- a pushing force.
Tension
- a pulling force.
Shear
- forces acting across the material.
Torsion
- a twisting force.
Bending
- forces act at an angle to the material.
Slide 13 - Diapositive
Tension
Shear
Torsion
Compression
Bending
Slide 14 - Question de remorquage
When a falling ball hits the floor the ball ____________
A
Deforms
B
Supports
C
Stretches
D
Compresses
Slide 15 - Quiz
Forces can _______ or ______ other objects
A
Deform
B
Support
C
Stretch
D
Compress
Slide 16 - Quiz
Order the statements to show how a solid surface provides a normal reaction force (which supports you)
1
2
3
4
Your weight pushes the particles in the floor together.
The Earth pulls down on you with a force of gravity, your weight.
The bonds push back and support you.
The bonds between particles in the floor are compressed.
Slide 17 - Question de remorquage
Which solid has a force acting upon it? How can you tell?
Slide 18 - Question ouverte
A team is having a tug of war. Describe what causes tension in the rope.
Slide 19 - Question ouverte
Slide 20 - Diapositive
Which shows elastic deformation?
A
B
Slide 21 - Quiz
Which shows inelastic deformation?
A
B
Slide 22 - Quiz
Elastic deformation
Inelastic deformation
Slide 23 - Question de remorquage
Describe in your own words what elastic deformation and inelastic deformation are.
Slide 24 - Question ouverte
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