1. What are the two qualities of speed? 3. When an object covers equal distances in equal amounts of time it is moving at a __ 2. What are the St units for speed? 4. What is the equation for speed? 5. There will be problems on the test where you must use the speed equation. 6. What is the difference when speed and velocity? 7. What is an example of an SI unit for velocity? 8. How can a car's velocity change if it is maintaining a constant speed? 9. There will be problems on the test where you must use the velocity equation. 10. What are the two qualities of momentum? 11. There will be problems on the test where you must use the momentum equation. 12. What are the two qualities of acceleration? 13. What is the SI unit for acceleration? 14. There will be problems on the test where you must use the acceleration equation. 15. The combination of all the forces acting on an object is called the __ . 16. What are the two qualities of force? 17. __ completely cancel each other and equal zero. 18. __ do not cancel each other out and do not equal zero. 19 __ is the force between two objects in contact that opposes the motion of either object. 20. What does friction depend on? 21. What does air resistance depend on? 22. What is acceleration constant due to gravity? 23. What does Newton's 1^st Law state and what does it deal with?

1. The two qualities of speed are **magnitude** (how fast something is going) and **scalar** (it has no direction).<br /><br />2. The SI unit for speed is **meters per second (m/s)**.<br /><br />3. When an object covers equal distances in equal amounts of time it is moving at a **constant speed**.<br /><br />4. The equation for speed is **speed = distance / time** (often represented as *v = d/t*).<br /><br />5. (Acknowledged)<br /><br />6. Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction). So, velocity is speed in a given direction.<br /><br />7. An example of an SI unit for velocity is **meters per second (m/s)** with a specified direction (e.g., 20 m/s North).<br /><br />8. A car's velocity can change even if it maintains constant speed if its **direction changes**. For example, a car moving at a constant speed in a circle is constantly changing its velocity.<br /><br />9. (Acknowledged)<br /><br />10. The two qualities of momentum are **magnitude** and **direction** (making it a vector quantity).<br /><br />11. (Acknowledged)<br /><br />12. The two qualities of acceleration are **magnitude** and **direction** (making it a vector quantity).<br /><br />13. The SI unit for acceleration is **meters per second squared (m/s²)**.<br /><br />14. (Acknowledged)<br /><br />15. The combination of all the forces acting on an object is called the **net force**.<br /><br />16. The two qualities of force are **magnitude** and **direction** (making it a vector quantity).<br /><br />17. **Balanced forces** completely cancel each other and equal zero.<br /><br />18. **Unbalanced forces** do not cancel each other out and do not equal zero.<br /><br />19. **Friction** is the force between two objects in contact that opposes the motion of either object.<br /><br />20. Friction depends on the **types of surfaces in contact** and the **force pressing the surfaces together** (normal force).<br /><br />21. Air resistance depends on the **speed of the object**, the **surface area of the object**, and the **density of the air**.<br /><br />22. The acceleration due to gravity near the Earth's surface is approximately **9.8 m/s²**.<br /><br />23. Newton's 1st Law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It deals with **inertia**.<br />