Chapter 12 Forces and Eriction (pages 889-300) 1. The following ouching mover false? Friction is a force that helps objects. That are touching move past each other more easily. __ B. Circle the letters identify types of friction. a. rolling b. gravity C. static d sliding 9. The friction force that acts on objects that are at rest is __ 10. Why is less force needed to keep an object moving than to start __ ded to keep in opjectmoring,manager.

Let's address each part of your question:<br /><br />1. **Friction Sentence True or False:**<br /> - The statement "Friction is a force that helps objects that are touching move past each other more easily" is **false**. Friction is actually a force that opposes the motion of objects sliding against each other, making it harder for them to move past each other.<br /><br />2. **Identify Types of Friction:**<br /> - The types of friction listed are:<br /> - a. rolling<br /> - c. static<br /> - d. sliding<br /> - Gravity (b) is not a type of friction; it is a separate force that acts on objects due to their mass and the mass of the Earth.<br /><br />3. **Friction Force on Objects at Rest:**<br /> - The friction force that acts on objects that are at rest is called **static friction**. Static friction prevents an object from moving when a force is applied until the force exceeds the maximum static friction.<br /><br />4. **Less Force Needed to Keep an Object Moving:**<br /> - Less force is needed to keep an object moving than to start it moving because once an object is in motion, it encounters **kinetic friction**, which is usually less than static friction. Static friction must be overcome to initiate movement, which requires more force compared to maintaining motion with kinetic friction.