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When solid surfaces are gripping or sliding past eachother what do they experience?

What do liquids/gases experience?

What do the arrows show on a diagram of an object?

When are forces balanced?

What is the resultant force?

Does the speed/direction change when there's a resultant force?

When are the forces unbalanced?

If the resultant force is bigger what does it mean?

What is momentum?

When the momentum is constant it means..