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What is work? energy? power?
什么是功？能？功率？
How do you calculate work?
如何计算功？
For a given motion, how does the direction
of the applied force affect the amount of
work done by the force?
对于给定的运动，施加的力的方向如何影响该力所做的功的大小？
What is kinetic energy? potential energy?
什么是动能？势能？
How is net work done on an object related
to its change in kinetic energy?
净作用在物体上的功与其动能变化之间有什么关系？
Find the velocity of an object dropped from
rest from a height h.
求一个从高度h处自由下落的物体的速度。
Given the mass of an object and the height from which it is dropped, can you calculate its impact force when it hits?
已知物体的质量和下落高度，能否计算它撞击时的冲击力？
How do seatbelts help protect you from
injury? Do they diminish the work done
on you in a collision? the force?
安全带是如何保护你免受伤害的？它们是否减少碰撞中作用在你身上的工作？力？
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