Chapters 2, 3, & 4 - Flashcards
What is a force?
A quantity that changes the velocity of an object.
What is Newton’s 3rd Law of Motion?
For every action there is an equal and opposite reaction.
(interaction partners always have the same magnitude and are in opposite directions)
What happens when you push on a wall with a certain amount of force?
The wall pushes back on you with an equal amount of force.
When a ball is rolling down a hill, what happens to acceleration? What happens to speed?
The ball’s acceleration will be constant and will not change. The ball’s speed will increase at a constant rate.
internal forces in a system all add to zero
What happens to acceleration when a ball is thrown straight up into the air?
Its acceleration decreases on the way up and increases on the way down.
Is acceleration directly proportional or inversely proportional to mass?
Acceleration is inversely proportional to mass.
Increase mass means decrease in acceleration.
Decrease mass means increase in acceleration.
What is inertia?
An object’s tendency to resist changes in its state of motion.
What is mass?
The amount of matter in an object.
What is velocity?
The rate of change of an object’s position.
What is Newton’s 1st Law of Motion?
An object at rest will stay at rest, and an object in motion will stay in motion in a straight line, unless acted upon by an outside force.
What happens to velocity when you round a curve without changing speed? What happens to acceleration?
Velocity will change because you are changing direction.
Acceleration will change because your velocity is changing.
Is a ball moving at a constant speed in a straight line in equilibrium? Why or why not?
Yes, the ball IS in equilibrium because it is traveling at a constant velocity, and it is not accelerating or changing direction. Therefore, all the net forces on it must equal zero, and it is in equilibrium.
What is a friction force?
A contact force that acts parallel to the contact surfaces.
What are interaction partners?
Force pairs that are equal in magnitude but opposite in direction, and act on different objects.
