year 9 Physics

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The force that opposes the motion of two surfaces sliding past each other is called ___________.

• acceleration
• inertia
• friction
• unbalanced

When forces on an object are balanced, what is the force?

• Five
• Ten
• Six
• Zero

What did J.J.Thomson discover?

• Neutrons

• Protons

• Atoms

• Electrons

Why do models of the atom change over time?

• When there is new evidence that disproves older models

• Because they fancy a change

• The atom changes all of the time

• Different scientists disagree so change them

Which two of these equations are correct for calculating density?

• Density = mass  $\div$  volume

• Mass = Density x volume

• Density = Mass x volume

• Volume = Density x mass