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本课程起止时间为:2020-02-17到2020-07-04
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CHAPTER 2. Newton’s Laws CHAPTER 1. The Kinematics of Mass Point–单元测验题

1、 问题:A golf cart moves with moderate speed as it reaches the base of a short but steep hill. The cart coasts up the hill (without using its brake or gas pedal). At the top of the hill the cart just about comes to rest; but then the cart starts to coast down the other side of the hill. Consider the forward motion of the cart to be positive. Which of the following velocity–time graphs best represents the motion of the cart?
选项：
A:
B:
C:
D:
答案: 【】

2、 问题:A car moves in a horizontal circle with a radius of 10m. The tangential velocity of the car is 30 m/s. What is the car’s acceleration?
选项：
A:3 m/s2 toward the center
B:3 m/s2 away from the center
C:90 m/s2 toward the center
D:90 m/s2 away from the center
答案: 【90 m/s2 toward the center】

3、 问题:A car in a drag race started from rest and accelerated constantly to a velocity of 50m/s when it reached the end of a 500m road. What was the car’s rate of acceleration?
选项：
A:−5.0 m/s2
B:−2.5 m/s2
C:0.5 m/s2
D:2.5 m/s2
答案: 【2.5 m/s2】

4、 问题:This graph depicts the motion of an object. During which time interval is the object at rest?
选项：
A:0–2 s
B:2–3 s
C:3–4 s
D:4–7 s
答案: 【3–4 s】

CHAPTER 3. Momentum CHAPTER 2. Newton’s Laws–单元测验题

1、 问题:Two boys push a 5kg box on a frictionless floor. James pushes the box with a 10.0N force to the right. Louis pushes the box with an 8.0N force to the left. What is the magnitude and direction of the box’s acceleration?
选项：
A:0.4 m/s2 to the left
B:0.4 m/s2 to the right
C:1.6 m/s2 to the left
D:1.6 m/s2 to the right
答案: 【0.4 m/s2 to the right】

2、 问题:A box of unknown mass (m) slides down a plane inclined at an angle (θ). The plane has a coefficient of friction (μ). Which of the following expressions would you use to calculate the rate of acceleration (a)?
选项：
A:a = g(sinθ − μgcosθ)/m
B:a = g(cosθ − μgsinθ)/m
C:a = g(cosθ − μsinθ)
D:a = g(sinθ − μcosθ)
答案: 【a = g(sinθ − μcosθ)】

3、 问题:You pull down on one side of a rope stretched across a pulley. Attached to the other side of the rope is a 10kg box. How much force must you pull down on the rope to get the box to accelerate upward at a rate of 10m/s2?
选项：
A:10 N
B:20 N
C:50 N
D:200 N
答案: 【200 N】

4、 问题:Two stars, each of mass M, form a binary system. The stars orbit about a point a distance R from the center of each star, as shown in Fig. 选4. The stars themselves each have radius r. What is the force each star exerts on the other?
选项：
A:
B:
C:
D:
答案: 【】

【作业】CHAPTER 2. Newton’s Laws 第二章作业

1、 问题:2.10 A small ball of mass m1=1. 6 kg is attached to a massless string that is connected to a mass m2= 1. 0 kg over an ideal pulley. The ball slides without friction on the table and travels in a circle of radius R =1 m as shown in Fig. 2. What is the period T of the circular motion? (g=10m/s)
评分规则: 【 图片清晰，步骤正确
】

【作业】CHAPTER 3. Momentum 第三章作业

1、 问题:3.4 An object with mass m is projected out from point O with initial velocity v0, the angle between v0 and the horizontal plane is α and we ignore the air resistance .( a ) What is the impulse of the gravity in the process of the object moving from the launching point O to the maximum height? ( b ) What is the impulse of the gravity of the object moving from point O to its landing point in the same horizontal plane?
评分规则: 【 图片清晰，答案正确
】

2、 问题:3.10 A l0kg box begins from rest and is pushed to the right by a force of 60N for 8s on a horizontal, friction less floor. After the force is removed, the box collides with a second box of mass M, which is initially at rest, and the two boxes move together a 25m/s. What is the speed of the first box after being pushed for 8 seconds (and before the collision)? What is the mass of the second box?
评分规则: 【 图片清晰，答案正确
】

CHAPTER 4. Work and Energy CHAPTER 3. Momentum–单元测验

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