| A | B |
|---|
| The energy associated with motion is called | Kinetic energy |
| Work equals force times | distance |
| An object that travels around another object in space is called a | satellite |
| Objects falling through air experience a type of friction called | air resistance |
| Weight equals mass times acceleration due to | gravity. |
| The force that one surface exerts on another when the two rub against each other is called | friction |
| In physical science, a push or a pull is called a(n) | force |
| You can show the motion of an object on a line graph in which you plot distance against | time |
| The International System of Units is used where? | all over the world |
| When an object’s distance from another object is changing, it is in | motion |
| If you know a car traveled 300 kilometers in 3 hours, you can find its | average speed |
| If you know the distance an object has traveled in a certain amount of time, you can determine the _____________ of the object | speed |
| If you were on the moon, your weight would be roughly what fraction of your weight on Earth? | one sixth |
| The law of universal gravitation states that any two objects in the universe, without exception,___________ each other | attract |
| According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail exerts an __________ _____________ back on the | equal force |
| Two figure skaters who push off of each other will move at the same speed if they have the same | mass |
| If you exert a force of 20 newtons to push a desk 10 meters, how much work do you do on the desk? | 200 joules |
| Unlike kinetic energy, potential energy is | stored |
| Potential energy that depends on height is called _________ ___________ energy | gravitational potential |
| Niagara Falls is a good example of _______________ energy being converted into ____________ energy | potential kinetic |
| A device that is twice as powerful as another can do the same amount of work in | half the time |
| Power equals work divided by | time |
| The ability to do work is called | energy |
| The rate at which work is done is | power |
| Any force that causes an object to move in a circle is called a(n) | centripetal force |
| Which of the following is an example of increasing friction intentionally? waxing skis, throwing sand on an icy driveway, adding grease to gears on a bike, oiling a squeaky door | throwing sand on an icy driveway |
| Energy is measured in units called | joules |
| Power is measured in units called | watts |
| Air resistance is a type of | friction |
| In order to do work on an object, the force you exert must be | in the same direction as the object’s motion. |
| The force that pulls falling objects toward Earth is called | gravity |
| What happens when two forces act in the same direction? | they are added together |
| If a bicyclist travels 30 kilometers in two hours, her average speed is | 15 km/h |
| On a graph showing distance versus time, a horizontal line represents an object that is | not moving at all |
| Liters, meters, and grams are all | units |
| A train that travels 100 kilometers in 4 hours is traveling at what average speed? | 25 km/h |
| The basic SI unit of length is the | meter |
| A place or object used for comparison to determine if something is in motion is called _____________ point | reference |
| The moon accelerates because it is continously changing _________________ | direction. |
| When two equal forces act on the same object in opposite directions, the net force is | zero |
| Which of Newton's law can explain how gases released from burning fuel in a rocket produce thrust? | Newton’s third law of motion |
| Which of the following is an example of rolling friction? your shoes on a sidewalk as you walk, a boat on the water as it sails, two hands rubbing together, bike tires on the road as you ride | bike tires on the road as you ride |
| When the only force acting on a falling object is gravity, the object is said to be | in free fall |
| The tendency of an object to resist any change in its motion is known as | inertia |
| Force equals mass times | acceleration |
| Work is measured in | joules |
| If the speed of an object does NOT change, the object is traveling at a(n) | constant speed |
| When you know both the speed and the direction of an object’s motion, you know the ____________ of the object. | velocity of the object. |
| Which of the following has kinetic energy? a rock poised for a fall, an archer's bow that is drawn back, a rolling bowling ball, a car waiting at a red light | a rolling bowling ball |
| Forces can be added together only if they are acting on the ___________ object | same |
| Changing direction is an example of a kind of | acceleration |
| In graphing motion, the steepness of the slope depends on how ____________ or ____________ the object is moving | how quickly or slowly the object is moving. |
