A World in Motion
This is what makes things move, slow down, speed up, change direction, or stop.
What is a force?
This person was interested in how objects move. He learned to predict the motion of different objects.
Who was Galileo?
What is magnetic force?
A force that pulls any two objects together.
What is gravity?
This type of text feature on page 3 is called:
What is a table of contents?
This is a force that pulls any two objects together.
What is gravity?
This person stated his ideas as three laws of motion.
Who is Isaac Newton?
What is air resistance?
Definition: The tendency of an object to resist change when it's at rest or in motion.
What is intertia?
The text in the bottom left corner of page 5 is called:
What is a photo caption (or caption)?
This is a force that resists motion when two objects rub against each other.
What is friction?
An object at rest will stay at rest unless a force acts on it. A moving object will keep moving at the same speed and in the same direction unless a force acts on it.
What is Newton's first law of motion?
This is the reason ski jumpers put wax on their skis.
To reduce friction between their skis and the snow.
Definition: shaped to reduce air resistance.
What is streamlined?
"A World in Motion" on page 6 is this type of text feature.
What is a subtitle?
These reduce friction by forming a slippery, thin layer between moving parts.
What are lubricants?
For every action there is an equal and opposite reaction.
What is Newton's third law of motion?
This is the reason ski jumpers shift their skis into a V-shape while in the air.
To increase the air resistance on the bottom of their skis and they can stay in the air longer.
Definition: how fast an object changes speed, direction, or both.
What is acceleration?
On page 9, there's a green box with the words "What if. . .? This is an example of what type of text feature?
What is a sidebar?
This is why astronauts may grow up to two inches taller while in space.
The force of gravity is less in space, so the bones in the spine move farther apart.
The more mass an object has, the more _________ is needed to change its motion.
What is force?
Seat belts in cars are designed to protect you from this (please use a science word).
What is inertia?
Definition: The push that is equal and opposite in strength and direction from the reaction force.
What is action force?
Pages 20-21 show an example of this type of text feature.
What is a diagram?