1. What is friction? slock a. List the four types of friction and their definitions. friction: a) friction: b) friction: c) friction: (P friction. 3. Friction that occurs in gases and liquids is called 4. True or False: Static friction prevents you from slipping when you walk on a sidewalk. 5. True or False: Sliding friction is stronger than static friction. 6. You use friction when you leave marks on paper with a pencil "lead." fric 7. The weakest type of friction that occurs between solid surfaces is and 8. Factors that affect the amount of friction against an object are 9. When you put on the brakes of your bike, the wheels stop turning. Friction between the wheels am slows your bike to a stop. Which type of friction is this? fluid friction c) sliding friction a) b) static friction d) rolling friction 10. The factors that affect gravitational pull on an object are I1. Define mass: a. Define weight:

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.