Inertia
What is inertia?
Inertia is the tendency of an object to resist changes in its state of motion
The combination of all forces acting on an object.
A. Acceleration
B. Vector
C. Net Force
D. Weight
C. Net Force
What does a free body diagram represent?
A free body diagram represents all the forces acting on a single object.
What is a collision?
When two objects bump into one another causing the energy to transfer between the two objects.
Forces acting on an object that combine and equal a net force of zero
Balanced Force
According to Newton’s First Law of Motion, what happens to an object at rest if no unbalanced forces act on it?
It will remain at rest
An object that experiences a push/ push has an ______ exerted on it.
Force
In a free body diagram, if an object is on a flat surface and not moving, what two forces are typically equal in magnitude but opposite in direction?
Normal Force and Gravitational Force
What are the 3 types of collisions? Draw models.
Motionless object collides with an object in motion. Object in motion collides with an object at rest. Two objects in motion collide.
Forces acting on an object that combine and do not equal zero
Unbalanced Forces
The greater the ______ of an object, the greater it's inertia.
Mass
The force that one surface exerts on another when the two rub together is known as
Friction
A box is sitting at rest on a table. Draw a Free Body Diagram to represent the forces acting on the box.
Normal Force (pointing up)
Gravitational Force (pointing down)
What happens to an object’s motion when it collides with another object?
The object's motion changes; it may speed up, slow down, or change direction depending on the forces involved.
If you push a book on a table with a force of 10 newtons and there is no movement, what can you say about the forces?
The forces are balanced because the book is not moving.
How does the concept of inertia explain why seat belts are important in a car accident?
Seat belts help to counteract the inertia of passengers, preventing them from continuing to move forward when the car stops suddenly.
Forces can be added together on if they are
acting on the same object
Gravitational force (down)
Normal force (up)
Applied Force (right)
Friction (left)
Which describes a collision in which the colliding objects do not change shape? Select all that apply.
A. an egg smashes on the ground
B. bumper cars bounce off each other at the park
C. two marbles bounce off one another
D. two cars collide and smash the front headlights
B, C
What type of force causes an object to change its motion or speed?
Unbalanced Force
When you are riding a bike and suddenly stop pedaling, what happens to the bike and why? How does this demonstrate the concept of inertia?
When you stop pedaling, the bike continues to move forward for a while before slowing down and eventually stopping. This demonstrates inertia because the bike's motion continues due to its inertia, and it only stops when unbalanced forces like friction and air resistance act on it.
An object is moving to the right with a constant speed. If there is a frictional force of 5 newtons opposing the motion, what must be the net force acting on the object?
The net force must be zero because the object is moving with a constant speed, indicating that the applied force to the right balances the frictional force of 5 newtons.
A car is in motion driving down a ramp. Draw a free body diagram to represent the forces acting on the ramp.
Gravitational (down)
Normal (up)
Applied force (slanted down)
Friction (slanted up, but smaller than applied force)
Forces that occur in an object can change 3 things...what are they?
Motion(speed) , Shape, Direction
An object experiences two forces: 8 newtons to the right and 3 newtons to the left. What is the net force on the object, and in which direction does it act? Is this balanced or unbalanced?
The net force is 5 newtons to the right (8 newtons - 3 newtons = 5 newtons) It is unbalanced.