Chapter 5 Ai Flashcards
(24 cards)
What is Newton’s Third Law of Motion?
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
What does the term ‘interaction’ refer to in physics?
It requires a pair of forces acting on two objects.
What happens to the apple-orange system if a force equal and opposite to the friction force occurs?
The system will move with constant speed.
What does Newton’s First Law of Motion state?
An object at rest tends to remain at rest; an object in motion tends to remain in motion at constant speed along a straight-line path.
What does Newton’s Second Law of Motion state?
When a net force acts on an object, the object will accelerate. The acceleration is directly proportional to the net force and inversely proportional to the mass.
What is the outcome when action and reaction forces act within a system?
They cancel each other out and do not cause acceleration.
What occurs when external frictional force acts on a system?
The external frictional force accelerates the system.
True or False: Action and reaction forces cancel each other out.
False
What is the relationship between the forces acting on a bug and a bus during a collision?
Both forces are equal in magnitude.
When a ramp is raised, which force remains constant?
mg
As the angle of the ramp increases, how does the normal force (N) change?
N decreases with increased angle of the ramp.
What force is responsible for the lift of a helicopter?
When lift is greater than the helicopter’s weight, the helicopter moves upward.
What do slightly tilted wings of airplanes do to produce lift?
They deflect oncoming air downward.
Compared to a lightweight glider, what must a heavier glider do to generate lift?
Push air downward with greater force.
What determines the vertical and horizontal components of a vector?
Resolution
In the context of action and reaction forces, what is an example of an interaction?
A hand and wall pushing on each other.
When you step off a curb, what does Earth do in reaction to your weight?
Earth pulls you upward.
What is the net force on a block when the ramp is raised to 90 degrees?
The net force is mg.
What happens to the accelerations of a cannon and cannonball when the cannon is fired?
They are different because the masses are different.
What is the simple rule to identify action and reaction in a force interaction?
Identify the interaction—one thing interacts with another.
Fill in the blank: Action—Object A exerts a force on object B. Reaction—Object B exerts a force on _______.
Object A
What is the effect of equal-magnitude forces acting on equal masses?
They produce equal accelerations.
Why do you not sense Earth moving upward when you step off a curb?
It moves, but by an imperceptible amount.
What is the definition of action and reaction forces?
They are co-pairs of a single interaction, equal in strength and opposite in direction.
