谁告诉这些题怎么写那- -(英文好的科学高手进)1) why does an experiment only ever have ONE independent varible?2) what is the relationship between mass and inertia of an object?3) why factors determine the amount of gravitational forc

谁告诉这些题怎么写那- -(英文好的科学高手进)1) why does an experiment only ever have ONE independent varible?2) what is the relationship between mass and inertia of an object?3) why factors determine the amount of gravitational forc
谁告诉这些题怎么写那- -(英文好的科学高手进)
1) why does an experiment only ever have ONE independent varible?
2) what is the relationship between mass and inertia of an object?
3) why factors determine the amount of gravitational force?
4) friction depends on what 2 factors?
energy、joules、mechanical energy 、potential energy、kinetic energy、law of conservation of energy、elastic potential energy、gravitational potential energy、chemical potential energy、thermal enerty、nuclear energy、electromagnetic energy、
energy transformation
选项..
1a) a ball held in the air has_____because it is above the floor and____is pulling the ball down.
1b)before the ground moves during an earthquake,the geologic plates that make up the crust are moving under the surface.they build up tremendous strain(_____)before that suddenly break loose and cause an____.
1c) batteries are a source of potential energy.they have___.so does food.
2a)the___of the ball is converted to___when the ball is dropped.
2b)the___of the geologio plates is converted to___when the plates move and cause the earthquake.
2c)the___in an battery is converted to light energy when you turn on a flashlight.
2d)what type of energy is required for plants to perform pfotosynthesis?
2e)if you increase the mass of a moving object,what happens to its kinetic energy?

谁告诉这些题怎么写那- -(英文好的科学高手进)1) why does an experiment only ever have ONE independent varible?2) what is the relationship between mass and inertia of an object?3) why factors determine the amount of gravitational forc
1.控制变量法.
2.inertia is proportional to mass
3.mass of earth； distance between the center of earth and the object
4.normal force； friction coefficient
选择题
1.gravitational potential energy；gravity
2.elastic potential energy；energy transformation
3.chemical potential energy
4.gravitational potential energy;kinetic energy
5.elastic potential energy;kinetic energy
6.chemical potential energy
7.light energy
8.increase
你选择题选项都不完整.第一题不知道该怎么答.见谅