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Force 7th grade
Question | Answer |
---|---|
Plants maintain constant size and shape due to: | turgor pressure |
Geotropism exhibited by plants means that a plant that has been laid on its side will: | grow its stem upward and its roots downward |
A simple machine reduces the amount of _____________ required to move an object. | force |
A simple machine reduces the amount of force required to move an object by increasing the ___________ that an object is moved. | distance |
There are 8 dogs attached to a sled with a man on it. The dogs are pulling the sled across the snow. Which statement best describes the force in motion? | The forces are unbalanced, and the dog's forces is greater |
If an object does not move when a force is applied to it then | no work is done |
Regardless of whether you use a ramp or if you lift the ground to move a box into a moving van, what remains the same? | work |
The goal of a simple machine is to reduce the amount of what? | force needed to move an object |
What best explains how a plant is able to grow upward? | It exerts a force greater than the force of gravity |
A wilted plant is given water and it becomes tall and strong because of: | turgor pressure |
As a seedling is sprouting through the soil, the force it exerts to move up must be greater than which of the following forces that are pulling downward? | gravity |
You gently roll a ball across the gym floor. What force will eventually make it come to a stop? | friction |
A plants roots will always grow in a downward direction. What force is affecting the root's growth? | gravity |
What is the simple definition of work? | movement of an object |
Define geotropism: | an organisms response to gravity |
An example of negative geotropism is | a plants stem growing upward |
An example of positive geotropism is | a plants roots growing downward |
What does a simple machine reduce? | force needed to do work |
Define phototropism | an organisms response to light/sun |
An example of negative phototropism is | a plants roots growing downward |
An example of positive phototropism is | a plant growing upward toward the sun |