Forces Skill Builder
| # | Answer |
|---|---|
| 1 | A force is a push or a pull on an object. |
| 2 | Push and pull. |
| 3 | Gravity. |
| 4 | It pulls the rock downward toward the ground. |
| 5 | Wind force, or the force of moving air. |
| 6 | Friction is a force that resists motion between two surfaces touching each other. |
| 7 | Friction between shoes and the ground helps prevent slipping. |
| 8 | Gravity. |
| 9 | The force of flowing water. |
| 10 | Wind can push and move loose soil particles from one place to another. |
| 11 | Gravity. |
| 12 | Gravity pulls more strongly downhill on steep slopes, making movement easier. |
| 13 | Flowing water can erode the channel and make it wider, deeper, or straighter over time. |
| 14 | Erosion is the movement of weathered rock or soil from one place to another. |
| 15 | Forces such as moving water, wind, ice, and gravity move sediment and cause erosion. |
| 16 | Gravity. |
| 17 | A glacier can push, scrape, and carry rock and soil as it moves. |
| 18 | The force of moving water. |
| 19 | Repeated wave force can wear away rock and reshape the shoreline. |
| 20 | Gravity. |
| 21 | Pressure is the amount of force applied over a given area. |
| 22 | A narrow footprint applies the same force over a smaller area, creating more pressure. |
| 23 | Wind pushes and lifts sand grains, piling them into dunes. |
| 24 | Gravity pulls the boulder downhill, while friction resists that movement and helps keep it in place. |
| 25 | For example, gravity pulls soil downhill and moving water or wind can carry it away, so the materials move because both forces act together. |