Force
Any push, pull, or lift that acts on an object.
What is a force?
Forward motion caused by the force of an airplane engine.
What is thrust?
The force that always pulls two objects together.
What is gravity?
A force that opposes (pushes against) the motion of one object moving past another.
What is friction?
When two forces act on ONE object but do not change its motion. This means that the object does NOT accelerate (does not change speed or direction).
What are balanced forces?
A force that lifts a less dense object out of a denser substance.
What is buoyancy?
The force of air resistance that slows down an airplane.
What is drag?
The scientist in the 1600s who researched gravity.
Who was Sir Isaac Newton?
Friction generates this.
What is heat?
When one force acting on an object is stronger than the other. This causes the object to accelerate (speed up, slow down, or change direction).
What are unbalanced forces?
Forces can change this about an object.
What is the object's shape?
Thrust must be ________ than drag to move the plane forward.
What is stronger, or greater?
The scientific law that says all objects in the universe pull on every other object.
What is Newton's Law of Universal Gravitation?
When air slows down an object and can cause drag forces, this occurs.
What is air resistance?
The scientific law that says objects do not change their motion unless some forces causes them to do so. (Also known as the law of inertia).
What is Newton's First Law of Motion?
Two units for measuring force.
What are Newtons (N) and pounds (lb)?
The upward motion caused by the force of air around the wings of the airplane.
What is lift?
Objects on Earth are pulled toward Earth by the great amount of gravity caused by the great amount of _____ of the Earth.
What is mass?
True or False: Water can exert resistance.
What is true?
In Newton's Second Law of Motion, we can find the force and acceleration of a moving object. What are the equations for force and acceleration?
What are . . .
Force = m x a
Acceleration = F/m
True or False: A force causes acceleration or deceleration
What is TRUE? A force causes an object to speed up or to slow down.
In order for the airplane to move upward, lift must be stronger than this force (which pulls down on the plane).
What is gravity?
Objects with greater ____________ have LESS gravitational pull.
What is distance?
The three things that can determine the amount of friction on something.
What are . . .
1. Texture of the surface (rough vs. smooth)
2. The amount of force
3. The weight of an object
The scientific law that says for every action there is an equal but opposite reaction.
What is Newton's Third Law of Motion?