Sci 206 Weeks 1-5 Exam | Questions & Answers (Verified) | Latest Update | Graded A+

A dolphin can leap several meters above the ocean's surface. Why doesn't gravity stop the dolphin from leaving the water? ANSWER: inertia carries it upward As you jump across a small stream, does a horizontal force keep you moving forward? If so, what is the force? ANSWER: there is no force keeping you moving forward Why does stamping your feet clean the snow off of them? ANSWER: feed accelerate upward, snow continues downwards Why does tapping you toothbrush on the sink dry it off? ANSWER: when toothbrush stops, inertia keeps water moving The back of your car seat has a head rest to protect your neck during a collision. What type of collision causes you head to press against the headrest? ANSWER: where car accelerates forward, like hit from behind Deeagles - Stuvia US An un-seat-belted driver can be injured by the steering wheel during a head-on collision. Why does the driver collide with the steering wheel when the car suddenly comes to a stop? ANSWER: driver's inertia keeps them moving forward Why do loose objects on the dashboard slide to the right when the car turns suddenly to the left? ANSWER: when car accelerates, loose objects are left behind why is you velocity continuously changing as you ride on a carousel ANSWER: direction changes, change in direction involves acceleration when you apply the brakes on your bicycle, which way do you accelerate? ANSWER: backwards one type of home coffee grinder has a small blade that rotates very rapidly and cuts the coffee beans into powder. Nothing prevents the coffee beans from moving, so why don't they get out of the way when the blade begins to push on them? ANSWER: the beans's inertia a blacksmith usually hammers hot metal on the surface of a massive steel anvil. Why is this more effective than hammering the hot metal on the surface of a thin steel plate? Deeagles - Stuvia US ANSWER: anvil's large mass slows its acceleration A sprinter who is running a 200-m race travels the second 100 m in much less time than the first 100 m. Why? ANSWER: in first 100m, must overcome inertia and accelerate if you pull slowly on the top sheet of a pad of paper, the whole pad will move. But if you yank suddenly on that sheet, it will tear away from the pad. What causes these different behaviours? ANSWER: pad's inertia tends to keep it in place if you drop a ball from a height of 4.9m, the ball will hit the ground 1s later. If you fire a bullet exactly horizontally from a height of 4.9m, the bullet will also hit the ground 1s later. Explain ANSWER: regardless of horizontal components, all objects fall at the same rate A speedboat is pulling a water-skier with a rope, exerting a large forward force on her. The skier is traveling forward in a straight line at constant speed. What is the net force she experiences? ANSWER: zero