Rough surfaces create more friction than smooth surfaces. Thats why cars have tires. Its also why we use rubber mats in areas that might get wet. In your bathtub, you may even use No-Slip tape. No-slip is another way of saying the items has a lot of friction. In Figure 1.9, the blades of the skates are very smooth. Thats why you cant slide across ice with shoes. The soles of your shoes are much rougher than skates. The rougher surface of shoes causes more friction and slows you down. Heavier objects also have more friction. A heavy object presses down with more force. The surfaces are held together more tightly. This makes the surfaces harder to slide past each other. Did you ever try to push something heavy across the floor? Heavy objects are much harder to push than light objects.

When there is more friction, is it harder or easier to push an object across the floor?

Tom's relaxation at the beach is interrupted by Jerry who inadvertently walks all over a sunbathing Tom going fishing . Jerry falls into Tom's mouth and while escaping , nearly causes Tom to swallow his beach towel . Jerry goes out to the pier and casts his favorite bait : cheese . Tom pulls on the line and makes Jerry reel him in . Jerry lets go of the line and Tom struggles to stay afloat , losing the string . Tom barely catches the pier , but Jerry swings the pole at him . After a few misses , Jerry whistles and then lands a direct hit . He runs to the end of the pier and pulls off the end board . Tom ca n't brake , and walks the plank until Jerry pulls it out , causing Tom to fall into the water and without emerging . A drowning Tom wakes up on the sea bed , where he finds himself still alive . He starts imitating the majestic sea creatures until he spots Jerry . The cat grabs him , but Jerry pulls away revealing that he has become a mer-mouse . Jerry swims in circles until Tom's head has done a 360 , and is then grabbed again . Jerry slaps Tom face with his tail , then spins his ears in to the shape of a wrench . The cat gives chase through shipwreck windows until Tom hangs back to swallow the mouse . Jerry breaks out through Tom's left eardrum . Jerry hides and disguises himself as a seahorse to join a father seahorse leading his babies , fooling the cat for only a while . Jerry then gets lassoed and captured , but Tom gets tricked into holding a fishing line and is caught .

When does Tom decide to get back at Jerry?

In the period before World War II, the New York Times published a vignette in their "The Talk of the Town" feature saying that Einstein was so well known in America that he would be stopped on the street by people wanting him to explain "that theory". He finally figured out a way to handle the incessant inquiries. He told his inquirers "Pardon me, sorry! Always I am mistaken for Professor Einstein." Einstein has been the subject of or inspiration for many novels, films, plays, and works of music. He is a favorite model for depictions of mad scientists and absent-minded professors; his expressive face and distinctive hairstyle have been widely copied and exaggerated. Time magazine's Frederic Golden wrote that Einstein was "a cartoonist's dream come true".
Why did Einstein pretend to be mistaken for Professor Einstein?