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7Sci Chapt.17 Review
Matter in Motion
| Question | Answer |
|---|---|
| Opposes motion between surfaces that are touching | friction |
| unit of force | newton |
| Is determined by combining forces. | net force |
| acceleration is the rate at which ___________ changes | velocity |
| What is the measure of gravitational force on an object? | weight |
| If a student rides her bicycle on a straight road and does not speed up or slow down, she is traveling with a constant _________. | velocity |
| What is a push or a pull, expressed in newtons,and can cause an object to speed up, slow down, or change direction. | Force |
| If you are a spacecraft that has been launched into space, your weight would..... | decrease because gravitational force is decreasing |
| The gravitational force between 1kg of lead and Earth is __________the gravitational force between 1kg of marshmallows and Earth. | the same as |
| What is the relationship between a reference point and motion? | Motion occurs when an object changes postion over time when compared with a reference point. |
| How is it possible to be accelerating but traveling at a constant speed? | Acceleration can occur simply by a change in direction. |
| How can you find the center of mass of an object? | You can find the center by spinning the object. |
| Which can change, mass or weight? | weight changes as the gravitational force changes |
| A kangaroo hops 60 m to the east in 5 s. What is the kangaroo's average speed? | 12m/s |
| a measure of the amount of matter in an object | mass |
| All matter has mass and is affected by ______? | gravity |
| The force of gravity is directly related to the amount of _______of the objects. | mass |
| What is an example of kinetic friction? | a box SLIDING on a floor |
| What is an example of static friction? | a worker pushing a NON-MOVING box |
| What are two factors that determine the amount of friction? | force and roughness of the surfaces |
Created by:
ahsimmon
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