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5-4,6 test
5-4,6-1 quiz
Question | Answer |
---|---|
a force of attraction between objects that is due to their masses | gravity |
Can gravity change motion? | yes |
All --- is affected by gravity | matter |
Why don't you see all gravity? | the mass of most objects is too small to cause large enough force to move objects |
Earth has a --- gravitational force and if you overcome it, you must apply ---. | large; force |
Newton watched a falling ---. | apple |
Newton concluded that an --- force caused an apple to fall. | unbalanced |
The law of universal gravitation describes the relationships between ---, ---, and ---. | gravitational force, mass, and distance |
Describe the law of universal gravitation | All objects in the universe attract each other through gravitational force. |
Part I of LUG: Gravitational force --- as mass increases. | increases |
Part II of LUG: Gravitational force --- as distance decreases. | decreases |
a measure of gravitational force on an object | weight |
What is used to measure weight? | spring scale |
Are weight and mass the same thing? | no |
the amount of matter in an object | mass |
--- (mass or weight) doesn't change while --- (mass or weight) does. | Mass; Weight |
What is used to measure mass? | a balance |
Unit for force: | Newton (N) |
Unit for weight: | Newton (N) |
Unit for mass: | Grams (g) or miligrams (mg) |
Acceleration due to gravity is --- for all objects | same |
The force that opposes the motion of objects though air | air resistance |
What does air resistance depend on? | size, shape, and speed |
The constant velocity of a falling object | terminal velocity |
The motion of a body when only the force of gravity is acting on the body | free fall |
Free fall occurs where there isn't any ---. | air |
--- objects are in free fall. | orbiting |
An object is orbiting when... | it is traveling around another object in space |
The curved path an object follows when it is thrown or propelled near the center of the Earth | projectile motion |
What are the two components of projectile motion? | horizantal and vertical motion |
What is Newton's first law? | An object at rest remains at rest, and an object in motion remains in motion at a constant speed and in a straight line unless acted on by ans unbalanced force |
An object will not be in motion until they are --- or ---. | pushed or pulled |
Will objects moving at a velocity continue to move at that velocity? | yes |
An unbalanced force to act on a moving object could be ---. | friction |
The tendency of an object to resist any change in motion | inertia |
mass = measure of --- | inertia |
Changing the motion of an object with less mass is ---. | easier |
What is Newton's second law? | The acceleration of an object depends on the mass of the object and the amount of force applied |
What is the first part of Newton's second law? | acceleration depends on mass |
Mass decreases = acceleration --- | increases |
What is the second part of Newton's second law? | acceleration depends on force |
Force increases = acceleration --- | increases |
What is Newton's third law? | Whenever one object exerts force on a second object, the second object exerts an equal and opposite force on the force. |
All forces act in ---. | pairs |
Can you always see the effect of a reaction? | no |
A quantity defined as the product of the mass and velocity of an object | momentum |
p= | momentum |
What is the Law of Conservation of Momentum? | any time objects collide, the total amount of momentum stays the same |
When two objects stick together, they move as ---- object(s). | one |
When two objects bounce off of each other the momentum is transferred... | from one object to another object |
The Law of Conservation of Momentum is similar to Newton's --- law. | third |
Can momentum be gained or lost? | no |