Roller Coasters, Gravity and Friction Quiz
 A force of attraction between objects due to theirmasses and the distances between them is _______air resistanceKinetic energyFrictionGravity A type of friction with airmolecules as an object falls is ___________speedmassair resistance gravity The hammer and the feather stayed where they were.6.11bIn 1971, the Apollo 15 spacecraft landed on the moon. During this mission,astronaut David Scott wanted to see what would happen if he dropped a hammerand a feather from the same height while standing on the moon’s surface. Heperformed the experiment, dropping both objects at the same time. What happened?The hammer hit the ground as the feather floated awayThe hammer and the feather hit the ground at the same time.The hammer hit the ground first and then the feather hit. Objects with greater masses havea ______________ force of attraction decreasedlessGreaterequal Your roller coaster had the greatest Kineticenergy _____________________near the bottom of the highest hillhalfway down the hillat the end of all the hillsat the top of the highest hill _____________ is a measureof gravitational pullfrictionweightair resistancepotential energy 6.8aWhich statement best describes the energy changes that occur while a child is riding ona sled down a steep, snow-covered hill?A. Kinetic energy decreases and potential energy increases.B. Kinetic energy increases and potential energy decreases.C. Both potential energy and kinetic energy decrease.D. Both potential energy and kinetic energy increase.ABCD 6.8aA cart at the top of a hill is released and rolls down the hill. Which of the followingdescribes the energy of the cart just as it reaches the bottom of the hill?A. The cart has no energy.B. The cart has maximum kinetic energy.C. The cart has maximum gravitational potential energy.D. The cart has equal gravitational potential and kinetic energy.ABCD 6.8cAn escalator at a shopping mall is 40 m long and moves at a constant speed of 2 m/s. Ifa student steps onto the escalator at the bottom while it is moving, how long will it takehim to travel the 40 m?A. 5 s B. 10 s C. 15 s D. 20 sABCD The force of attraction between two objectsdepends ona Japanese sandwichthe air resistancetheir weightsmass and distance put the paper on top the tennis ballcrumple the paper into a shape like the tennis ballfold the paperHow might a student get a tennis ball anda piece of paper to hit the ground at the same time when dropped? A force can be a _______ or a _______.'A) spin, rotateB) push, pullC) balance point, counterbalanceD) wheel, axleABCD  ________ is a force on earth that is caused by two things rubbing together.A) motionB) spinningC) frictionD) inertiaABCD We know that _______ is what makes an object stay sitting still or keep moving until a force acts upon it.A) counterweightB) forceC) inertiaD) frictionABCD Friction is present whenever surfaces _________A) break openB) look like simple machinesC) are smoothD) touchABCD Which object has the most potential energy?A) Mr. Murray falling from an 8ft. ladderB) Mr. Murray falling from the 4ft. deskC) Mr. Murray standing on a 4 ft. deskD) Mr. Murray standing on an 8 ft. ladderABCD Which force slows down a basketball rolling along the ground the most?A) solar energyB) air resistanceC) frictionD) gravityABCD If my car takes 0.2558 seconds to go30 centimeters, what is its speed incm/second?0.00852 cm/sec7.674 cm/secnone of these117.28 cm/sec
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