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1、1.An object that s movingcircular path.True statementsSAT 模拟试题 (1) with constant speed travels once around aabout this motion include which of the-following?A.The displacement is zeroB. The average speed is zeroC. The acceleration is zeroD. None of the above2.Which of the following must always be tr
2、ue?1.If an objects acceleration is constant,then it must move in a straight line2.If an objects acceleration is zero,then its speed must remain constant3.If an objects speed remains constant,then its acceleration must be zero.A.1 and 2 onlyB.1 and 3 onlyC.2 only D.3 onlyE.2 and 3 only4.A frictionles
3、s inclined plane of length 20m has a maximum vertical height of 5m. If an object of mass 2 kg is planced on the plame . Which of the followingbest approximates the net force it feels?A.5N B.10NC.15ND.20NE.30N5.A person who weighs 800N stepsonto a scale that is on the floor of anelevator car. If the
4、elevator accelerates upward at a rate of 5 m/s2 , what willthe scale read?A.400NB.800NC.1000ND.1200NE.1600ND6 .A person standing on a horizontal floor feels two forces: the downward pullof gravity and the upward supporting force from the floor. There two forcesA. have equal magnitudes and from an ac
5、tion /reaction pairB. have equal magnitudes but do not from an action /reaction pairC. have unequal magnitudes and from an action /reaction pairD. have unequal magnitudes and do not from an action /reaction pair E.None of the aboveB7 .How long would it take a car,starting from rest and accelerating
6、uniformly in a straight line at 5m/s 2 ,to cover a distance of 200m?A.9s B 10.5sC.12.0sD.15.5sE.20.0sA8 .A rock is dropped off a cliff and strikes the ground with an impact velocityA.15mB.20mC.30mD.45mof 30m/s.How high was the cliff?E.60m9 .A soccer ball at rest on the ground,is kicked with an initi
7、al velocity of 10m/s at a launch angle of 30 0 .Calculate its total flight time , assuming that resistance is negligible.A.0.5s B.1s C.1.7s D.2s E.4s10.If all of the forces acting on an object balance so that the net force is zero , thenA.the object must be at restB. the object s speed will decrease
8、C. the object will follow a parbolic trajectoryD. the object s direction of motion can change,but its speed cannotE.None of the above11.The coefficient of static friction between a box and a ramp is 0.5.airTheramp s incline angle is 300 .If the box is placed at rest on the ramp, box willA. accelerat
9、e down the rampB. accelerate briefly down the ramp but then slow down and stopC.move with constant velocity down the rampD.not moveE.Cannot be determined from the information given12.A 20N block is being pushed across a horizontal table by an 18N force . If the coefficient of kinetic friction betwee
10、n the block and the table is 0.4. findhe acceleration of the block2A.0.5 m/sB.1 m/s 2C.5 m/s 2D.7.5 m/s2 E.9m/s 213.A stoneis thrown horizontallywith aninitial speed of 30m/sbridge.Findthe stone s total speed whenit enters the water 4from asecondslater(Ignore air resistance.)E.70m/sA.30m/sB.40m/sC.5
11、0m/sD.60m/s0to the borizontal?14.Which one of the following statements is true concerning the motion of an ideal projectile launched at an angle of 45A.The acceleration vector points opposite to the velocity vector on the way up and in the same direction as the velocity vector on the way downB.The s
12、peed at the top of the trajectory is zero.C.The object s total speed remains constant during the entire flightD.The horizontal speed decreases on the way up and increases on the way downE.The vertical speed decreases on the way up and increases on the way downE15 .Which pair of forces can produce a
13、resultant of 15 newtons?A.20N,20NB.25N,5NC.5N,5ND.7N,7NE.5N,3NA16 .Two crates are stacked on top of each other on a horizontal floor , crate #1is on the bottom , and crate #2 is on the top . Both crates have the same mass . Compared with the strength of the force F 1 necessary to push only crate #1
14、at a constantspeed across the floor, the strengthof the forceF 2 necessary to push the stack at the same constant speed across the floor is greater than F becauseA.the force of the floor on crate #1 is greaterB.the coefficient of kinetic friction between crate #1 and the floor is greaterC.the force
15、of kinetic friction. But not the normal force, on crate #1 is greaterD. the coefficient of static friction between crate #1 and the floor is greaterE.the weight of crate #1 is greaterA17 .A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between crate and the
16、 floor is 0.4, land the coefficient of kineticfriction is 0.3. A force F of magnitude 344N is then applied to thecrate,parallel to the floor. Which of the following is true?2A.The crate will accelerate across the floor at 0.5m/sB.Thestatic friction force , which is the reaction force to F as guarant
17、eed byNewton s third law . will also have a magnitude of 344NC.The crate will slide across the floor at a constant speed of 0.5m/sD.The crate will not moveE None of the aboveD18 .A block of mass m is at rest on a frictionless, horizontal table placed in alaboratory on the surface of the earth . An i
18、dentical block is at rest on africtionless, horizontal table placed on the surface of the moon . Let F be thenet force necessary to give the earth-hound block an acceleration of a acrossthe table . Given that g moon is one sixth of g earth , the force necessary to givethe moon-boud block the same ac
19、celeration a across the table isA.F/12B.F/6C.F/3 D.F E.6FD19 .As the angle between two concurrent forces increases,the magnitude of their resultantA.increases only B.decreases and then increasesC.increases and then decreasesD.remains the same E.decreasesonly E20 .A girl walks 2 meters north, 4 meter
20、s west,and 2 meters south.Her final displacement isA.4 m east B.4m west C.2m north D.2m south E.5m northwest B21 .A cart is pulled by a rope making an angle of 450 to the horizontal.If 100newtons of force are applied to the rope,the magnitude of the horizontal component force is approximatelyA.45NB.
21、141NC.100ND.80NE.71NE22 .A moon of mass m orbits a plant of mass 100m. Let the strength of the gravitational force exerted by the planet on the moon be denoted by F1 ,andlet the strength of the gravitational force exerted by the moon on the planetbe F 2 .Which of the following is true?A. F 1=100 F 2
22、B.10 F 2= F 1 C. F1= F 2. D. F2.=10 F 1 E. F2.=100F 123 .At the surface of the earth , an object of mass m has weight w . If thisobject is transported to an altitude that at the new locationA. its mass is m/2 and its weight is w/2 C.its mass is m/2 and its weight is w/4 w/4E. .its mass is m and its
23、weight is w/9 E24.If the distance between gravitational force between thems twice the radius of the earth , then ,B. its mass is m and its weight is w/2D. .its mass is m and its weight istwo point particles is doubled, thentheA.decreases by a factor of 4B. decreases by a factor of 2C. increases by a
24、 factor of 2D. increases by a factor of 4E.Cannot be determined without knowing the masses25 . The resultant of a 3-newton and a 4-newton force acting simultaneously on an object at right angles to each other is,in newtonsA.0B.1C.3.5D.5E.7Dis26 .Two force act together on an object.The magnitude of t
25、heir resultantleast when the angle between the forces isA.0B.45C.60D.90E.180E27 .The resultant of a 5-newton and a 12-newton force acting simultaneouslyon an object in the same direction is,in newtons.A.0B.5 C.7 D.13E.17E28 . An object is moving around a circle of radius 1.5 meters at a constantvelo
26、city of 7 meters per second. The frequency of the motion, in revolutionper second, isA.0.24B.0.53C.0.67D.0.74E.0.98D29 .An object undergoes uniform accelerated motion. If the radius of the pathis 2 meters and the period is equal to 4 seconds, the magnitude of the centyipetal acceleration is equal to
27、A.5m/s 2B.10 m/s 2C.20 m/s 2D.25 m/s 2E.30 m/s 2A30 .An object undergoes uniform accelerated motion. If the radius of the pathis equal to 1.5 meters and the magnitude of the centripetal acceleration isequal to 6 m/s 2 ,the magnitude of the tangential velocity is equal toA.3m/s B.4 m/s C.5 m/s D.6 m/s E.9 m/sA-