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Module 3 Test
Freshman Year Semester 2 Module 3 Test
| Question | Answer |
|---|---|
| What is weight? | The force of gravity on an object |
| What piece of lab equipment measures weight directly? | Spring scale |
| Does gravity exist between all objects? | Yes |
| What is the constant for acceleration due to gravity? | 9.8 m/s/s |
| Know how to calculate weight | Mass times gravitation acceleration |
| What is the equation for weight when on Earth? | Mass times 9.8 m/s/s |
| What unit is used for weight? | Newtons |
| What does one Newton equal? | kg x m/s/s |
| N/kg= | m/s/s |
| N/m/s/s= | kg |
| Is gravitational acceleration the same for all objects? | Yes |
| Why don't all objects fall at the same rate? | They don't fall at the same rate because air resistance pushes the object up, and gravity pushes them down. Air resistance is affected by the size and shape of the object, so they fall at different rates. |
| What does the Law of Universal Gravitation state? | All objects have gravitational attraction between them, but it differs in power. |
| What is the relationship between mass and gravitational attraction? | Direct |
| What is the relationship between distance and gravitational attraction? | Inverse |
| What is the moon's gravitational attraction? | 1/6 of Earth's, or 1.63 m/s/s |
| Tell me why it's difficult to walk on the moon. | The moon has 1/6 of the mass that the Earth does, so it has 1/6 of the gravitational attraction, so your body isn't being pulled as strongly to the moon as you are to the Earth. |
| True or false: You weigh less on the moon because you're further away from the Earth. | False; the moon has it's own gravitational force, so it doesn't matter how far you are from the Earth. You weigh less because the moon has less gravitational attraction than the Earth because the moon has 1/6 of Earth's mass. |
| How many Newtons are in a pound? | There are 4.45 N in every lb. |
| What is the only force in a free fall? | The only force is gravity |
| What is Newton's First Law of Motion? | An object at rest tends to stay at rest until acted on by a force. An object in motion tends to stay in motion until acted on by a force |
| What is Newton's Second Law of Motion? | The acceleration of an object is directly proportional to the force exerted on it and inversely proportional to its mass |
| What is Newton's Third Law of Motion? | For every force, there's an equal force in the opposite direction |
| Which law is also known as the Law of Inertia? | Newton's First Law |
| What is the definition of inertia? | The tendency of an object to do nothing or remain unchanged in its position |
| What is the equation for Newton's Second Law of Motion? | F=ma |
| What is a force? | A push or pull on an object |
| How do you combine forces in the same direction? | Add them |
| How do you combine forces in opposite directions? | Subtract them |
| What is a balanced force? | Forces in the opposite direction with the same force |
| What is the net force of balanced forces? | 0 |
| What is an unbalanced force? | Forces either in the same direction or different forces |
| What kind of numbers are never net forces? | Negative numbers |
| What direction does friction act in? | It acts in the direction opposite of the direction the object is moving |
| What is air resistance? | The friction of the air that makes some objects fall at different speeds than others |
| What can affect air resistance? | The size and shape of an object |
| If air resistance was removed (i.e. a vacuum) what would happen if a feather and a golf ball fell at the same time? | They would fall at the same rate and hit the ground at the same time |
| What are two ways that friction is helpful, not harmful? | 1. Cars wouldn't have any way of stopping without it, which would lead to many car crashes 2. We would constantly be in motion forever without it |
| What is the equation for calculating the coefficient of friction? | M=Force to slide/weight |
| What Greek letter is used for coefficient of friction? | Mu |
| What are the units for coefficient of friction? | There are no units |
| What three things do you need to express a force? | A direction, a size, and a unit |
| What causes friction? | Microwelds |
| What is static friction? | Friction that stops an object from changing its motion |
| What are the three types of friction involved in moving objects? | Sliding, rolling, and fluid |
| What is sliding friction? | Opposes the motion of two surfaces sliding past each other |
| Does sliding friction typically have more or less force than static friction? | Less |
| What are two examples of sliding friction? | Sliding down a slide and rubbing your hands together |
| What is rolling friction? | Force resisting motion when two surfaces roll on each other |
| What are two examples of rolling friction? | Wheels on a car when someone is driving it and a soccer ball rolling down the field |
| What is fluid friction? | Friction between layers of gas/liquid stopping motion |
| What are two examples of fluid friction? | Swimming in a pool and throwing a ball |
| What are the three frictions from greatest to less force? | Sliding, rolling, and liquid |
| Why might someone weigh less on a mountain than they do at sea level? | Because distance and gravitational pull have an inverse relationship, the further away you are from the center of the Earth, the less gravity will affect you. We know that weight is gravity pulling you down, so the person would weigh less. |
Created by:
Mrs. Wiles Lover
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