Chapter 3: Force Flashcards
Force
A push or pull of one body on another body.
What is the unit of force?
Newtons (N)
Examples of force are:
Pulling a car
A book resting on a table
Opening a door
A chicken pulling a cart full of eggs
What are the following things force can do?
Can change motion Start movement Stop movement Change the direction of movement Can cause an object in motion to speed up or slow down
What are the following things force can do?
Can change motion Start movement Stop movement Change the direction of movement Can cause an object in motion to speed up or slow down
How many types of forces are there?
2 types
Unbalanced Force (Object moves)
Forces of equal size acting in the same direction
The force is unbalanced when…
You push or pull something and it moves.
What is an example of an unbalanced force?
A horse pulling a cart.
Balanced Force (Force does not move)
Forces of equal size, but moving in opposite directions.
What is an example of a balanced force?
Tug of war, pushing a wall
Newton’s First Law
A body in motion will stay in motion unless an external force acts upon it to make it stop. A body at rest will stay at rest unless an external force acts upon it to make it move.
Law of Inertia
Also known as Newton’s First Law
What are examples of Newton’s First Law?
A soccer ball sitting on grass
Coasting down the street on a bike
A seatbelt saving a life
Law of Inertia
A property of matter that describes an object’s ability to resist a change in its motion.
The measure of inertia is…
The amount of mass an object has
The measure of inertia is…
The amount of mass an object has
The more mass an object has…
The more inertia it has
When the velocity of an object is zero…
The object is at rest
What is an example of inertia?
A 5 kilogram bowling ball is 100 times as massive as a 50 gram gold ball, so it has 100 times the inertia.
What is an example of inertia?
A 5 kilogram bowling ball is 100 times as massive as a 50 gram gold ball, so it has 100 times the inertia.
Which object in each pair has more inertia?:
A baseball at rest or a tennis ball at rest
