Science - Chapter 2 Forces
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Created by:
Laxryguy on January 13, 2012
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Classes:
OHA IS BOSS, OHA Class of 2013
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40 terms
Terms | Definitions |
|---|---|
 What happens when two forces act in the same direction? | Their strengths are added. |
| The greater the mass of an object | the greater its inertia |
| The force of gravity on a person or object on the surface of a planet is called | weight |
| The force that one surface exerts on another when the two rub against each other is called | friction |
| The law of universal gravitation states that any two objects in the universe that have mass, without exception, | attract each other |
| Forces can be added together only if they are | acting on the same object |
| According to the law of conservation of momentum, when two objects collide in the absence of outside forces | the objects have the same momentum before and after they collide |
| Any force that causes an object to move in a circle is called a(n) | centripetal force |
| The momentum of an object is in the same direction as its | velocity |
| According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail | exerts an equal and oppostie force on the hammer |
| In physical science, a push or pull is called a(n) | force |
| Which of the following is an example or rolling friction? | between your bike tires and the road as you ride |
| Which of the following is an example of increasing friction intentionally? | throwing sand on an icy driveway |
| The force of gravity on a person or object at the surface of a planet is known as | weight |
| The amount of matter in an object is called its | mass |
| The force that pulls falling objects toward Earth is called | gravity |
| The tendency of an object to resist change in its motion is known as | inertia |
| The product of an object's mass and velocity is called its | momentum |
| How can you increase the momentum of an object? | by increasing its mass |
| The total momentum of a group of objects is conserved unless | outside forces act on the objects |
| An object that orbits another object in space is called a(n) | satellite |
| When the only force acting on a falling object is AIR RESISTANCE, the object is said to be in free fall. T or F | F - when the only force acting on a falling object is GRAVITY |
| The property of matter that resists a change in motion is called INERTIA. T or F | True |
| According to Newton's second law of motion, WEIGHT depends on an object's mass and the net force acting on the object. T or F | F - ACCELERATION |
| Friction depends on the types of surfeaces involved and how HARD the surfaces push together. T or F | True |
| Mass and AIR RESISTANCE affect the gravitational attraction between objects. T or F | DISTANCE |
| The overall force on an object after all the forces are added together is called the _______ force. | Net force |
| One _________ is the force required to accelerate 1 kilogram of mass at 1 meter per second per second. | Newton |
| The force of gravity between you and the Earth is greater than the force of gravity between you and a car because Earth has more _____ than the car. | Mass |
| According to Newton's third law of motion, the strength of a reaction force is _______ the strength of the action force. | opposite |
| The force of gravity is responsible for continuously changing the ______ in which a satellite moves. | orbit |
| Wet pavement is more slippery than dry pavement because the force needed to overcome ________ friction is less than the force needed to overcome sliding friction | fluid |
| Friction acts in a direction ______ to an object's direction of motion. | opposite |
| As the distance between two object's decreases, the gravitational force between them ___________. | increases |
| An object's inertia is a measure of its | mass |
| A person traveling in as car that stops suddenly keeps moving forward due to | inertia |
| If the action force of a bat striking a ball accerlerates the ball in one direction, the reaction force accelerates the bat in the _________ direction. | opposite |
| The momentum of an object is in the same ___________ as its velocity. | direction |
| The momentum of a roller skate in not conserved because ________ acts on the skates. | friction |
| Because the moon travels around the Earth, it is a(n) ___________. | satellite |
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