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Stack #4594701
| Question | Answer |
|---|---|
| using one or more of your senses to gather information | observation |
| grocery stores organize food according to food type- diary, frozen, bakery, and so on. This is called | classification |
| observations that deal with a number or amount | quantitative |
| observations that deal with descriptions that cannot be expressed in numbers are called | qualitative |
| the steps commonly used by scientists in gathering information to test hypothesis and solve problems are called | scientific method |
| a possible explanation for a set of observations or answer to a scientific question is called | hypothesis |
| the part of an experiment in which all conditions are kept the same is the | control |
| the following are examples of data | temperature, time & distance |
| a statement that describes what scientists expect to happen every time under a particular set of conditions is a | prediction |
| to reveal trends in data, that data should be presented in a | graph |
| scientists can communicate their results via | graphs, tables & written reports |
| a well-tested explanation for a wide range of observations or experimental results is called a | scientific theory |
| In physical science, a push or a pull is called a | force |
| An example of exerting force | pushing a door open |
| balanced forces acting on an object | do not change the objects motion |
| what happens when two forces act in the same direction | add together |
| the SI unit for force is the | Newton (N) |
| The tendency of an object to resist change in its motion is know as | intertia |
| the greater the mass of an object | greater its intertia |
| when an object's distance from another object is changing, it is in | motion |
| it is rare for any motion to | continue for very long |
| the force that one surface exerts on another when the two rub against each other is called | friction |
| give an example of rolling friction | ball rolling on the ground |
| air resistance is a type of | friction |
| the achievement of lifting a rocket off the ground and into space can be explained by Newtons | 3rd Law of Motion |
| the product of an object's mass acceleration is called its | force |
| how can you increase the momentum of an object | increase mass of velocity |
| speed equals distance divided by | time |
| when you I know both the speed and direction of an object's motion, you know the | velocity of the object |
| average speed is defined as | total distance traveled divided by total time taken to cover the distance. |
| if you know the distance an object has traveled in a certain amount of time, you can determine | the speed of the object |
| if a bicycle travels 30 kilometers in two hours, her average speed is | 15 km/h |
| if speed is measure in kilometers per hour and time is measured in hours, the unit of acceleration is | kilometers per hour |
| to determine the acceleration of an object, you must calculate the change in speed during each unit of | time |
| in an acceleration graph showing speed versus time, a straight line shows the acceleration is | constant speed |
| what is the equation for acceleration | A=VF-VI F |
| Any force that causes an object to move in a circle is called | centripetal force |
| the ability to do work is called | energy |
| energy is measured in units called | J (Joules) |
| The energy associated with motion is called | kinetic energy |
| when you rub your hands together on a cold day, you use friction to covert | kinetic energy to thermal energy |
| the type of energy stored by fossil fuels such as coal is | chemical energy |
| give an example of kinetic energy | moving car |
| unlike kinetic energy, potential energy is | stored energy |
| potential energy that depends of heights is called | gravitational potential energy |
| how would you calculate an objects's mechanical energy | kinetic energy + potential energy |
| for work to be done on an object | a force must be applied, and the object must move (displace) a certain distance in the direction of that force |
| give an example of work being done on an object | pushing a box across the floor |
| work equals force times | distance |
| in order to do work on an object, the force you exert must be | in same direction as the motion |
| if you exert a force of 20 newtons to push a desk 10 meters, how much work do you do on the desk | work = f x a 20 n x 10 m =200J |
Created by:
aherald