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Physics study Unit 2
Physics study guide unit 2
| Question | Answer |
|---|---|
| What does Newton’s First Law of Motion state? Give an example of how it applies to everyday life. | Every object continues in a state of REST or at CONSTANT speed in a straight line unless acted on by an external non zero net force. ex. A book stays at rest on a table until someone pushes it. |
| What is inertia? | inertia is a property of matter that resists change in motion -defines what inertia is |
| What is the relationship between an object's mass and its inertia? | The greater the mass of an object, the greater its inertia. -defines how mass AFFECTS inertia |
| What is Newton's Second Law of Motion? | F=ma an object's acceleration depends on the net force acting on it and its mass. |
| If you increase the force on an object while keeping its mass the same, what happens to its acceleration? | The greater the net force, the greater the acceleration (when mass stays the same). -acceleration increases |
| If mass increases while net force stays the same, what happens to acceleration? | Acceleration decreases. |
| How do you calculate horizontal net force? | F net = F right - F left |
| How do you calculate vertical net force? | F net = F up - F down |
| When is an object in equilibrium? | When its net force is zero F net = 0 |
| What happens to an object at rest in equilibrium? | It stays at rest. |
| What happens to a moving object in equilibrium? | It continues at constant speed in a straight line. |
| What is the difference between distance and displacement? Give an example. | Distance: The total length of the path traveled Displacement: The straight-line change from where you started to where you ended, including direction ex. You walk 5 meters east, then 5 meters west. - Distance = 10 m - Displacement = 0 m |
| What is the relationship between speed and velocity? | Speed tells how fast. Velocity tells how fast and in what direction. |
| What is the difference between speed and velocity? | Speed: How fast an object moves. Velocity: Speed AND direction. |
| What is a vector? | A vector is a quantity with magnitude and direction. |
| What did Aristotle believe about motion? | An object needs a continuous force to keep moving. |
| What did Galileo believe about motion? | Objects keep moving unless an external force changes their motion. |
| How did Galileo disagree with Aristotle? | Galileo said objects don't need a continuous force to keep moving. |
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