Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
A force is described by what? |
magnitude and direction |
|
|
Arrows are often used to represent the direction and _______ of a force. |
strength or magnitude |
|
|
The unit for magnitude, or strength, or a force is? |
newton (N) |
|
|
The combination of all forces acting on an object is called the ___ _______. |
net force |
|
|
When two forces act in opposite directions to each other, one is a positive force and one is a _____ force. |
negative |
|
|
If the opposing forces are of equal strength, the net force is ___. |
zero |
|
|
_______ forces acting on an object result in a net force and cause a change in the object's velocity. |
Unbalanced |
|
|
Equal forces that act on one object in opposite directions are called _____? |
balanced forces |
|
|
Balanced forces acting on an object do not change the object's _____. |
velocity or speed |
|
|
What is a force that two surfaces exert on each other when they rub against each other. |
friction |
|
|
Does a smooth surface produce more or less friction than a rough surface? |
less |
|
|
What is a force that pulls objects toward each other? |
gravity |
|
|
The statement that "the force of gravity acts between all objects in the universe" is known as ____. |
The Universal Law of Gravitation |
|
|
The force of gravity between objects _____ with greater mass and ______ with greater distance. |
increases |
|
|
The amount of matter in an object is known as its ______. |
mass |
|
|
The scientific unit of mass is the _____. |
kilogram |
|
|
The gravitation force exerted on a person or object at the surface of a planet is known as _____. |
weight |
|
|
When the only force acting on an object is gravity, the object is said to be in ____ _____. |
free fall |
|
|
What type of friction acts on objects falling through the air. |
Air resistance |
|
|
What causes a flat piece of paper to fall slower than a crumpled piece of paper? |
Air resistance |
|
|
The formula for acceleration is: |
Acceleration = net force / mass |
|
|
What is the name of the man credited with much of our knowledge of forces? |
Sir Isaac Newton |
