8th Grade Science Exam Questions
The total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction:
The smallest particle of an element that still retains the properties of the element; tiny building block of matter, made up of protons, electrons, and neutrons
Which is a force that resists motion between two surfaces that are in contact?
Friction
Newton's first law of motion states that....
An object will remain at rest or keep moving with a constant velocity unless a force acts on it
Acceleration is calculated by dividing the force exerted on an object by the mass of the object
When a force act on an object, its acceleration is in the same direction as the force
When a force is applied to an object, there is an equal force applied by the object in the opposite direction.
A ball is thrown straight up in the air. According to Newton's first law of motion, what is the reason for the ball falling back down
Newton's Second Law of motion states that.....
An object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
When a force is applied on an object, there is an equal force applied by the object in the opposite direction
The force on an object can be found by dividing it mass by its acceleration
Acceleration is calculated by dividing the force exerted on an object by the mass of the object
Newton's Third law states that.....
An object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it.
When a force is applied on an object, there is an equal force applied by the object in the opposite direction
Acceleration is calculated by dividing the force exerted on an object by the mass of the object.
The force on an object can be found by dividing the mass by its acceleration
Which is the largest number of individuals of a particular species that the environment will support
Where is desertification most likely to be found?
In a reclaimed strip mine
In a green space in the middle of urban sprawl
In an area where the forest has been cleared and intensive farming has occurred
In a desert area designated for recreational use because of its interesting natural features.
Which is not an effect of water pollution?
It can disrupt the water cycle
Ir can add toxic chemicals to water
It can disrupt the balance of nutrients in water
It can kill wildlife found in the water
Which is true of the greenhouse effect
It is purely a manmade phenomena
It does not involve carbon dioxide
It causes cooling of earth's atmosphere
It traps thermal energy from the sun
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