Vocab Match-up
What is the force that resists motion between two surfaces?
Friction
An apple falling from a tree .
Gravity
An object in motion will eventually stop on its own.
False
What safety device in cars demonstrates Newton’s First Law?
Seatbelts
A push or pull on an object is called what?
Force
If you slide a book across the table, what unbalanced force makes it stop?
Friction
A heavier object has less inertia than a lighter one.
False
What happens to the inertia of an object if its mass increases?
Inertia Increases
The amount of matter in an object is its ____.
Mass
Why does a magician’s tablecloth trick work?
inertia keeps the objects at rest
Gravity only acts on objects that are falling.
False
What force slows down a skydiver before they open their parachute?
Air Resistance
The tendency of an object to resist changes in motion is called what?
Inertia
A soccer ball eventually stops after being kicked. What force causes it to stop?
friction with the ground, air resistance
Newton’s First Law is also called the Law of Inertia.
True
An object at rest stays at rest unless acted on by a(n) ________.
unbalanced force
the vector sum of all forces acting on an object.
net force
Why do you lurch forward when a car suddenly stops?
inertia keeps your body moving forward
Ms. Bradley is the best science teacher
TRUE
If a rolling ball doesn’t encounter friction, what will happen?
it will keep rolling forever in a straight line at the same speed