PS.5.1.1
If you dissolve sugar in water, what happens to the total weight of the solution?
It stays the same.
When two liquids are mixed and a solid forms, what is the solid called?
Precipitate
What happens to a chocolate bar when it is left in the sun?
It melts
Which factor would NOT change the motion of an object?
Friction or Color
Color
What is the main reason objects fall to the ground?
Gravity
What happens to the weight of a piece of wood after it is burned in a fire?
It becomes lighter.
When you burn a piece of paper, what new substances are formed?
Ash and smoke
What is the effect of heating on the molecules in most materials?
They move faster
Best describes gravity
A force that pulls objects toward each other
When a car speeds up, what happens to its acceleration?
It increases
How does the weight of a balloon change when it is inflated with air?
The weight increases.
What is the term for a change that results in the formation of one or more new substances?
Chemical change
What happens to water molecules when water is boiled?
They expand and form vapor
What is the main reason astronauts appear to float in space?
They are in free fall around Earth
What is the unit of speed in the metric system?
Meters per second (m/s)
When you compress a spring and release it, what happens to its weight?
It stays the same.
Which observation might indicate that a new substance has been formed?
Bubbles are forming
What is a practical application of heating metal?
Forging tools
If you slide a book across a table, what role does friction play?
It causes the book to stop
Describes Inertia
The tendency of an object to resist changes in its state of motion
If you mix vinegar and baking soda, producing a gas, how does the total weight of the system change?
It decreases.
What is the main purpose of carrying out an investigation when mixing substances?
To determine if new substances are formed
Why is it important to understand how materials react to heating and cooling?
To create more durable materials
If you increase the mass of an object, what happens to the force needed to move it?
The force increases
If two objects with different masses are dropped from the same height, which will hit the ground first?
the heavier or the Lighter
Both at the same time