Chapter 6 - Motion in Two Dimensions Flashcards
At each point in the vertical direction, the velocity of the object as it is moving upward has the same _______ as when it’s moving downward. The only difference is that the directions of the two velocities are ________.
- Magnitude
- Opposite
What is maximum height?
It is the height of the projectile when the vertical velocity is zero and the projectile has only it’s horizontal velocity component.
What is the range? (How far?)
It is the horizontal distance the projectile travels when the initial and final heights are the same.
Reasoning:
Why the acceleration is related to the change in velocity, not just the change in speed?
Because their directions are changing, the objects must be accelerating.
Define uniform circular motion.
It is the movement of an object at constant speed around a circle with a fixed radius.
As the object moves around the circle, the length of the position vector does not change, but it’s direction does.
True.
Each velocity vector is at a right angle to the correction position vector. It is in the same direction as the displacement.
True.
The acceleration of an object in uniform circular motion is the change in velocity divided by the time interval. The direction of centripetal acceleration is always ____________________ of the circle.
Toward the center.
Does the direction of the acceleration vector change if the objects moves around the circle?
Yes, but it always points toward the circle.
Define centripetal acceleration.
The acceleration of an object in uniform circular motion.
The angle between the position vectors, r1 and r2 is the same as that between the velocity vectors, v1 and v2.
True.
When an object moves in a circle, the net force toward the center of the circle is called the _____________.
Centripetal force.
What is a reference frame?
It is a coordinate system from which motion is viewed.
