20年11个物理模块2的练习问题2：动态

问题6.

两个街区,3公斤,5公斤双倾斜lope connected to each other with a rope and frictionless pulley. The 3kg block is inclined at an angle of 60 degrees and the 5kg block is inclined at an angle of 30 degrees. Calculate the acceleration of the blocks then calculate the tension in the rope.

调查，描述和分析经受恒定净力的单个物体的加速度，并将物体的运动与牛顿第二次运动法（ACSPH062，ACSPH063）相关联

问题7.

当物体突破两件时，较轻的片段比较重的片段获得更多的动能。这是势力保护的结果。用牛顿的议案解释它。

将牛顿的前两项动议施加到各种日常情况下，包括静态和动态示例

问题8.

一个6.00kg盒子坐在40度的倾斜度。盒子和倾斜之间的动力学摩擦系数为0.40。将盒子移动到符合4.2 ms-2的恒定加速度所需的水平力是多少？

将牛顿的前两个动议定律应用于各种日常情况，包括静态和动态示例，包括摩擦（ACSPH063）所扮演的作用

动量，能量和简单的系统

问题9.

在分裂日志时，较重的锤子比较轻的锤子更有效。为什么这么好？

Conduct an investigation to describe and analyse one-dimensional (collinear) and two-dimensional interactions of objects in simple closed systems (ACSPH064)

问题10

Explain the use of crumple zones and airbags in cars for safety reasons. Make reference to Newton’s three laws of motion as well as the concept of impulse.

评估碰撞和其他相互作用所涉及的力的影响，并使用冲动概念进行定量地分析相互作用

问题11

In a rescue operation, a team of firefighters is trying to reach the top floor of a building. One scales the walls of the building, the other takes the winding stairs outside the building and one takes the stair that go directly to the top floor. Which one does the most work? Provide reasons for your answer.

Apply the special case of conservation of mechanical energy to the quantitative analysis of motion

问题12

30公斤物体在10ms-1的水平表面下滑动，并由于摩擦而停止。物体与表面之间的动力学摩擦系数为0.2。当物体停止时，摩擦产生的平均力量是多少？

在一系列机械过程中进行调查，以定性和定量地分析平均力量的概念

问题13

A 20.0kg child plays on a swing with 2.00m support ropes. The brother pulls the child back until the roes are 45 degrees from the vertical and releases it from rest. What is the potential energy just as the child is released compared to the potential energy at the bottom of the swing’s motion?

Apply the special case of conservation of mechanical energy to the quantitative analysis of motion

问题14

Consider a collision between a 1000kg car travelling 20ms-1 to the North and a small truck with a mass of 3000kg travelling 15ms-1 East. If the car and truck join together due to the collision, what is their final velocity?

通过守恒守则进行定量和预测来分析(ACSPH066)

问题15

如果一对物体的动量为零，那些物体的动能也必须为零吗？解释你的推理。

通过守恒守则进行定量和预测来分析

问题16

一根机枪在金属块中烧制。如果子弹反弹，或者如果它们被嵌入到板上，那么金属上的平均力会更大？解释你的推理。

分析和比较弹性和非弹性碰撞的动量和动力量

问题17.

在一个大瀑布中，直接下面的水被加热。解释这是如何发生的。

Apply the special case of conservation of mechanical energy to the quantitative analysis of motion

问题18.

A box slides down an incline and work is done on the box by the gravitational force as well as the frictional force. Can the work done be expressed in terms of a change in potential energy? Explain your reasoning.

Apply the special case of conservation of mechanical energy to the quantitative analysis of motion

问题19.

A worker horizontally pushes a 30.0 kg crate a distance of 5.0 m along a level floor at a constant velocity. The coefficient of kinetic friction between the crate and the floor is 0.30. What is the total work done on the crate?

Apply the special case of conservation of mechanical energy to the quantitative analysis of motion

问题20.

An object is pulled by having a rope attached to it, causing it to accelerate. However, according to Newton’s third law, the object pulls back on the rope with a force of equal magnitude and opposite direction. Is the total work done then zero? If so, how does the kinetic energy of the body change?

Apply the special case of conservation of mechanical energy to the quantitative analysis of motion