Chapters 6, 7 and 8 - Newton's 2nd and 3rd Laws and Momentum Flashcards
Directly proportional means as one variable increases the other variable _________ .
Increases.
Inversely proportional means as one variable increases the other variable _________ .
Decreases.
According Newton’s 2nd Law, force and acceleration are __________ related.
Directly
According Newton’s 2nd Law, mass and acceleration are __________ related.
Inversely
What causes an object to accelerate?
Unbalanced forces.
When the air resistance force on an object builds up to where it equals the weight of the object, it stops accelerating. What is this speed (or velocity) called?
Terminal speed (or terminal velocity)
Newton’s third law states that whenever one object exerts a force on a second object, he second object exerts an _______ and ________ force on the first object.
Equal and opposite.
What is the reaction force to a tire pushing on a road?
The road pushing on the tire.
What is the reaction force to Earth’s gravity pulling on a falling ball?
The falling ball’s gravity pulling on the Earth
What word describes inertia in motion?
Momentum
Momentum is the product of what two factors?
mass and velocity
The change in momentum depends on the force that acts and what else?
The length of time it acts.
Impulse is the product of what two factors?
Force and the time interval over which it acts.
If you lengthen the time over which a change in momentum occurs, the force of impact ________ .
Decreases
In the absence of an external force, the momentum of a system remains _________ .
Constant or unchanged. This is the law of conservation of momentum.
