Key learning points

1. More force is needed to hold up a bigger mass up in the air.
2. The bigger the mass on a beam, the more the beam bends.
3. The more a beam bends, the greater the force it pushes back with.
4. The bigger the mass on a floor, the more particles in the floor are squashed together.
5. The more particles in a floor are squashed together, the greater the force they push back with.

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.

Common misconception