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Force/Newton's Law
Lab Exam Review
| Question | Answer |
|---|---|
| What is a push or pull called ? | force |
| What is created when 2 or more forces act on an object at the same time ? | net force |
| Can a net force cause a change in the motion of an object ? | yes |
| Can a net force cause a change in velocity? | yes |
| Can a net force cause acceleration? | yes |
| Is a force a vector ? | yes |
| Does force have direction ? | yes |
| Who was the unit for force named after ? | Isaac Newton |
| What is the unit for force ? | Newton (N) |
| What is a kg m/s^2 ? | Newton |
| What are the arrows that represent forces acting on an object (system) called ? | vectors |
| What are the forces object total when there are NO net forces ? | zero |
| Are forces balanced or unbalanced when the net forces is zero? | balanced |
| Do balanced forces cause acceleration ? | no |
| What is force due to gravity called ? | weight |
| What is the amount of matter in an object called ? | mass |
| Which is measured with a spring scale in Newtons? mass or weight | weight (forces) |
| What are forces that involve a body or bodies being studied a part of ? | a system |
| What is a sketch representing the system and the forces involved called ? | free body diagram |
| F=ma | 2nd Law of Motion |
| For every action, there is an opposite reaction | 3rd Law of Motion |
| An object at rest wants to stay at rest | 1st Law of Motion |
| Law of Inertia | 1st Law of Motion |
| States that objects resist a change in motion | 1st Law of Motion |
| Explains why seat belts are used | 1st Law of Motion |
| States that a net force is needed to accelerate a mass | 2nd Law of Motion |
| Explains how jet engines propel airplanes | 3rd Law of Motion |
| Has action-reaction pairs (involves 2 objects) | 3rd Law of Motion |
| What is the force that opposes the motion of a horizontally moving object called ? | friction |
| What is the force that opposes a free-falling object called? | air resistance |
| What forces are friction and air resistances an example of ? | drag forces |
| If the force of friction equals the applied force, does the object accelerate ? | no |
| If the force of air resistance equals the force of gravity does a falling object accelerate ? | no |
| What is the final speed called of a falling object (it is achieved when air resistance up equals the force of gravity down) ? | terminal velocity |
| What is the name of the force that acts upward on the surface that an object is sitting on a surface (it opposes the weight) ? | normal force |
| What is the ratio of a frictional force to the normal force called ? | coefficient of friction |
| What is the unit for the coefficient of friction ? | it doesn't have one |
| What is the symbol for the coefficient of friction ? | ยต ( u with a tail) |
| What is the name of the type of friction that prevents an object from beginning to slide across a surface ? | static |
| What is the name of the coefficient of friction between a surface and an object that is not sliding ? | static |
| What is the name of the type of friction that exists between a surface and an object sliding across it ? | sliding (kinetic) |
| What is the name of the coefficient of friction between a surface and an object sliding across it ? | sliding (kinetic) |
| Which is greater: coefficient of static friction or the coefficient of sliding (kinetic) friction ? | static |
Created by:
mckay05
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