| Term | Definition |
|---|
| Friction | What unbalanced force cause a ball to stop rolling? |
| Friction | What is the force that opposes motion between two surfaces that are in contact |
| The weight of the object and the roughness of the surface | What are two factors that affect the amount of friction between two surfaces? |
| It has more effect on the object and slows it down faster. | What happens to friction if the force is pushing surfaces together increases? |
| Rough surfaces because it has more hills and valleys which produces greater friction | Is the amount of friction greater between rough surfaces or smooth surfaces? |
| The friction you observe when something moves. | What's kinetic friction? |
| Sliding and rolling kinetic friction. | What are two types of kinetic friction? |
| Sliding kinetic friction is usually greater because there is no round surface. | Which has greater friction? Sliding or rolling kinetic friction? |
| The friction you observe when an object doesn't move. | What's static friction? |
| A lubricant. | What's a substance applied to reduce friction called? |
| Switching from sliding to rolling kinetic friction; By making surfaces in contact smoother; By using lubricants. | What are three ways friction can be reduced? |
| Making surfaces rougher, increasing force on the objects rubbing together. | What are two ways friction can be increased? |
| Because every surface of any object is somewhat rough. | Why does friction occur? |
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