Starter quiz
- Which word is used to describe the downwards force of an object on a surface it is resting on?
- weight ✓
- thrust
- friction
- upthrust
- magnetic
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- Which of the following affects the amount of weight of an object on a surface?
- the shape of the object
- the mass of the object ✓
- the surface area of the object
- the gravitational field strength ✓
- the strength of the surface
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- What word is used to describe a material that returns to its original shape when the forces acting on it are removed?
- rigid
- plastic
- elastic ✓
- soft
- stretchable
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- What type of electric charge do electrons carry?
- north
- south
- negative ✓
- positive
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- What type of force acts between two objects that are electrically charged?
- magnetic
- gravitational
- friction
- weight
- electrostatic ✓
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- Which of the following correctly describe the structure of an atom?
- a small, negatively charged nucleus containing protons and neutrons
- a small, positively charged nucleus containing protons and neutrons ✓
- a small, nucleus (with no charge) containing protons and electrons
- negatively charged protons surrounding a nucleus
- negatively charged electrons surrounding a nucleus ✓
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Exit quiz
- Match the key words with the descriptions.
- elastic⇔a material that returns to its original shape when forces are removed ✓
- gravitational force⇔a force that acts on any object in a gravitational field ✓
- normal reaction force⇔a force that acts upwards when an object rests on a surface ✓
- electrostatic force⇔a force that acts between electrically charged particles ✓
Izzy holds a mass stationary in her hand. Which statements are correct?- There is no force acting on her hand.
- There is no resultant force on the mass. ✓
- The upwards force on the mass is equal and opposite to the downwards force. ✓
- The downwards force less than the upwards force.
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- What happens to the size of the electrostatic forces between two surfaces when they are pushed closer together?
- it remains constant
- it decreases
- it increases ✓
- it becomes zero
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- Some pupils use a plank of wood to build a bridge across a ditch. They walk across the plank one at a time to get to the other side. What happens to the wooden plank as they walk across?
- The plank does not bend because it is solid.
- The plank will bend slightly as they cross. ✓
- The heavier the pupil, the more the plank will bend. ✓
- The bridge will bend by the same amount for each pupil.
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- How do the forces between atoms in solids operate?
- When the atoms are too close together the forces pull the atoms together.
- When the atoms are too close together the forces push the atoms apart. ✓
- When the atoms are a little bit too far apart the forces push the atoms apart.
- When the atoms are a little bit too far apart the forces pull atoms together. ✓
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- A 5 kg mass is placed on a solid surface. What happens when a second identical mass is placed on top of the first?
- The size of force pushing down on the surface increases. ✓
- The size of force the surface pushes up with remains the same.
- The atoms in the surface are pushed closer together and repel each other more. ✓
- The atoms in the surface are pulled further apart and repel each other less.
- The surface produces a larger upwards force. ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- More force is needed to hold up a bigger mass up in the air.
- The bigger the mass on a beam, the more the beam bends.
- The more a beam bends, the greater the force it pushes back with.
- The bigger the mass on a floor, the more particles in the floor are squashed together.
- The more particles in a floor are squashed together, the greater the force they push back with.
Common misconception
There is a downwards force on a surface, but no upward force, the surface just gets in the way.
Have pupils describe upward forces they need to exert whilst supporting different sized weights at arms length.
Keywords
Gravitational force - A gravitational force acts on any object inside a gravitational field.
Normal reaction force - When an object rests on a surface, there will be a normal reaction force acting on it.
Elastic - Materials are elastic if they return to their original shape when forces are removed from them.
Electrostatic force - The force between two electrically charged particles is an electrostatic force.
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