9PH (9I)

Which one of these is a force?

• Mitosis

• Friction

• Electrolysis

• Bioluminescent

Gravity is a force that is only present at certain times of the day.

• True

• False

Gravity, air resistance, thrust, tension and centrifugal are all examples of forces.

• True

• False

Who discovered Gravity?

• Guglielmo Marconi

• Nikola Tesla

• Sir Isaac Newton

• Rosalind Franklin

[BLANK] is a force between two surfaces that are sliding, or trying to slide, across each other. For example, when you try to push a book along the floor, [BLANK] makes this difficult. (Note: it's the same work for both [BLANK] answers)