forces and motion notes Flashcards
What is Free Fall Motion?
This form of motion only occurs in a vacuum or in outer-space.
In Free Fall Motion, the only force acting on the object is gravity.
What is the acceleration rate of all objects toward Earth in free fall?
9.8 m/sec².
This acceleration is constant regardless of the object’s mass.
Define Terminal Velocity.
The constant velocity of a falling object when the force of air resistance equals the force of gravity.
At terminal velocity, the object no longer accelerates.
What happens to net force at terminal velocity?
Net force is equal to zero.
This means no acceleration is occurring.
How does the size and shape of a falling object affect its motion?
It affects the amount of air resistance encountered.
For example, a crumpled piece of paper falls faster than a flat sheet due to less resistance.
What is the formula to calculate the velocity of an object in free fall?
Δv = g (9.8 m/sec²) x t.
This formula helps determine the change in velocity over time.
What initiates Projectile Motion?
An object is launched by an initial force greater than the force of gravity.
This motion always follows a curved path due to gravity.
What are the two components of projectile motion?
- Vertical motion
- Horizontal motion
These components are independent of each other.
How does vertical motion behave in projectile motion?
It goes up and then down due to gravity.
The object slows down as it reaches its peak and speeds up as it falls.
What is centripetal motion?
A combination of simultaneous forward movement and free fall toward Earth.
This keeps objects in orbit due to the curved path of Earth.
What is centripetal force?
The inward force that keeps an object moving in a circular path.
This force is always changing direction due to the changing forces acting on the object.
True or False: The forces acting on an object in centripetal motion are constant.
False.
The forces are always changing, affecting the direction of the object’s motion.
Fill in the blank: The object in centripetal motion is always trying to move toward the _______.
center.
This is the most stable location for the object.
