CH 8-1 CONCEPTUAL Physics NEXT-TIME QUESTION CONSIDER THREE TYPES OF ROLLERS ON A PAIR OF PARALLEL TRACKS: (1) A CYLINDER. (2) A PAIR OF CUPS FASTENED AT THEIR NARROW ENDS. AND (3) A PAIR OF CUPS FASTENED AT THEIR WIDE ENDS. WHEN ROLLED ALONG THE TRACK, ONE IS VERY UNSTABLE AND ROLLS OFF THE EDGE. ANOTHER IS MODERATELY STABLE FOR SHORT DISTANCES. THE OTHER IS VERY STABLE AND CENTERS ITSELF ON THE TRACK. WHICH IS WHICH? 2 How does the stable roller relate to the wheels of railroad cars? Howit CONCEPTUAL Physics NEXT-TIXE QUESTION A B THE CENTERS OF GRAVITY OF THREE TRUCKS PARKED ON A HILL ARE SHOWN BY THE DOTS. WHICH TRUCK(S) WILL TIP OVER? Howat CH 8-3 CONCEPTUAL Physics NEXT-TIME QUESTION WHEN SHE SHAKES THE BASKETFULL OF BERRIES, THE LARGER BERRIES WILL a) SINK TO THE BOTTOM. b) GO TO THE TOP. c) NOT PARTICULARLY SINK NOR RISE, BUT LIKE THE SMALLER BERRIES, BE RANDOMLY DISTRIBUTED. Howit TRINIT! CONCEPTUAL Physics NEXT-TIME QUESTION Gravity Force on Shuttle When at rest on the launching pad, the force of gravity on the space shuttle is quite huge the weight of the shuttle. When in orbit, some 200 km above Earth's surface, the force of gravity on the shuttle is a) nearly as much. b) about half as much. c) nearly zero (micro-gravity). d) zero. CH 9-1 (Neglect changes in the weight of the fuel carried by the shuttle) DO Howet, tarwit!. CONCEPTUAL Physics NEXT-TIME QUESTION Consider a giant flat plate that touches the Earth at one point and extends out into space. Suppose you slide an iron block along the plane, where it makes contact with the Earth. Suppose also that the plate is perfectly frictionless, air drag is absent, and Vo Vescape. The block will a) continue at constant velocity, in accord with the law of inertia. b) increase in speed as the force of gravity on it weakens with distance. c) decrease in speed due to the pull of gravity d) oscillate to and fro. Galileo considered this nearly 5 centuries ago! CH 9-2 Thanx to Ken Ford Hewit Jaznit!. CH 9-3 CONCEPTUAL Physics NEXT-TIME QUESTION IF THE SUN SUDDENLY COLLAPSED TO BECOME A BLACK HOLE, THE EARTH WOULD a) LEAVE THE SOLAR SYSTEM IN A STRAIGHT-LINE PATH. b) SPIRAL INTO THE BLACK HOLE. c) CONTINUE TO CIRCLE IN ITS USUAL ORBIT. Howit -Paint!.