1.Which of the following statements about displacement and distance are correct. （ ）
A:The displacement is directed from the initial position to final position
B:The displacement is not along the motion path
C:The displacement is reversed as the initial and final positions exchanged
D:The magnitude of the displacement equals to the distance
E:The displacement is always parallel to average velocity
答案:distance
2.In linear motions, the magnitude of displacement always equals to the distance. （ ）
A:正确
B:错误
答案:错误
3.If a force acting on a particle that speeds up, the work done by the force must be positive. （ ）
A:错误
B:正确
答案:错误
4.Energy is a quantity that can be converted from one form to another but cannot be created or destroyed. （ ）
A:错误
B:正确
答案:正确
5.Kinetic energy theorem is only valid as there are only conservative forces acting on the target. （ ）
A:正确
B:错误
答案:错误
6.The magnitude of average velocity may not equal to average speed, but the magnitude of instantaneous velocity must equal to instantaneous speed. （ ）
A:正确
B:错误
答案:错误
7.A physical quantity has both magnitude and direction, so it must be a vector quantity. （ ）
A:正确
B:错误
答案:正确
8.The commonly used unit for energy is Joule, and any other unit of energy can be converted into Joule. （ ）
A:错误
B:正确
答案:正确
9.You run due east with a constant speed 3 m/s for 10 s, and then run due west with a constant speed 2 m/s for 5 s. What is the magnitude of average velocity. （ ）
A:8/3 m/s
B:4/3 m/s
C:1 m/s
D:5 m/s
答案:m/s
10.A bullet is fired horizontally at 9.8 m/s from a cliff. Assume no air resistance, what will its speed be after 1 second of being fired. （ ）
A:9.8 m/s
B:6.9 m/s
C:13.9 m/s
D:19.6 m/s
答案:m/s
11.A car travels along x axis with a constant acceleration. If it travels in 10 s, with the speed from 20 m/s in the -x direction and to 40 m/s in the +x direction, what is the displacement. （ ）
A:100 m
B:600 m
C:300 m
D:200 m
A: B: C: D: 13.A particle of mass
rotates with angular speed 
about an axis that is distance 
away from the particle. What are the angular momentum 
and kinetic energy 
. （ ）A:, B:, C:, D:, E:, 14.A conservative force
acts on a particle which moves along a circular path of radius 
and return back to its initial position. What is the work done by the force.（ ）A: B: C: D: 15.A juggler throws a bowling pin up with an initial speed of 14.7 m/s. How much time elapses until the bowling pin returns to the hand of juggler.（ ）
A:4.5 s B:3.0 s C:1.5 s D:2.0 s 16.The Newton (N) is the SI derived unit of force, and the unit conversion of 1 N is （ ） .
A: B: C: D: 17.An unstressed spring of spring constant
is initially compressed by a distance of 0.4 m, and finally stretched by a distance of 0.4 m. What is the change of spring elastic potential energy.（ ）A:16 J B:0 J C:8 J D:4 J 18.The dot product of two vectors equals to the magnitude of their cross product. The angle
between the two vectors can be（ ）.A: B: C: D: 19.A 2-kg block is pushed against an unstressed spring of spring constant 200 N/m, and compress it 0.1 m. What is the change of kinetic energy of the block.（ ）
A: J B: J C: J D: J 20.Pushed by a force
, a 2-kg particle moves along 
direction from 
m to 
m, while its speed changes from 2 m/s to 4 m/s. What is the magnitude of the force. （ ）A: B: C: D: E: 21.The Joule (J) is the SI derived unit of energy, and the unit conversion of 1 J is（ ）.
A: B: C: D: 22.In Newtonian mechanics, not all quantities are independent, what are the three base quantities. （ ）
A:force, mass, velocity B:force, mass, time C:length, mass, time D:mass, length, velocity 23.Vectors
and 
. What is the dot product of these two vectors.（ ）。A: B: C: D: 24.Four particles with the same mass of 2 kg locate at four corners of a square. If the side length of the square is 2 m and its center is at the origin, what is the center of mass of the system.（ ）
A: m B: m C: m D: m E: m 25.If a flea can jump straight up to a height of h, what is its initial speed as it leaves the ground. （ ）
A: B: C: D: 26.A vector is represented in magnitude and angle to +x axis as
, and its components are 
. Which of the following equations are correct. （ ）A: B: C: D: E: 27.For an oscillation with period
, frequency 
, and angular frequency 
, which of the following equations are correct. （ ）A: B: C: D: E: 28.Which of the following objects can be taken as an inertial frame of reference . （ ）
A:A car that is at rest B:A car that speeds up C:A car that is slow down D:A car that moves with a constant speed E:A car that moves with a constant velocity 29.Which of the following unit conversions are correct. （ ）
A: B: C: D: E: 30.For a simple harmonic oscillation in the x direction
, which of the following equations for kinetic energy 
and potential energy 
are correct. （ ）A: B: C: D: E: 31.If car A is moving faster than car B, the net force on car A must be larger than that on car B. （ ）
A:错 B:对 32.In freely falling motion, two objects with different mass have the same acceleration. （ ）
A:错 B:对 33.Both distance and speed of a motion can be measured directly. （ ）
A:错 B:对
