Physical science NC’s released form

question

Why does a flat piece of notebook paper take longer to reach the ground than an identical piece of notebook paper crumpled into a ball?
answer

Because the frictional force of air has more effect on the falling flat piece of paper.
question

why does the weight of an object change with increasing elevation on earth?
answer

Because the force of gravity acting on the object decreases with higher elevation.
question

Which type of friction occurs when an eraser is rubbed across a sheet of paper?
answer

It’s sliding friction.
question

What is an example of a mixture?
answer

A bronze pipe.
question

What is one the elements that is the most chemically reactive?
answer

Potassium.
question

How can two different nonmetals form a compound?
answer

by sharing electrons.
question

What is the chemical formula for magnesium hydroxide?
answer

Mg(OH)2
question

What is the correct name for the compound NaNO3?
answer

Sodium nitrate
question

Why does a student’s hand feel cold when holding an ice cube?
answer

Because heat flows from the hand cold to the ice cube.
question

What happens to molecules in a pot of water as it is heated?
answer

They move faster
question

What describes the kinetic energy of a ball in free fall?
answer

The kinetic energy increases because the velocity increases.
question

How do radio waves and visible light waves differ?
answer

Radio waves have a lower frequency than visible light waves.
question

What is true about a series circuit?
answer

All the current flows through every part of the circuit.
question

This action will have the least effect on the strength of an electromagnet?
answer

Changing the current’s direction.
question

Why is there no gravity on the moon?
answer

The moon’s gravity is much less than the earth’s gravity and weight is a measure of the gravitational pull between two objects.
question

How many planets our in the solar system?
answer

8
question

What is the hottest planet in our solar system?
answer

Venus
question

Is life possible on Mars?
answer

No it’s been proven unsuitable for life due to the hostile whether environment.
question

How long does it take to get to Mars?
answer

About 260 days.
question

Which planet is closest to earth?
answer

Venus

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