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What is motion?
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How do you know when you are in motion?
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Science
Motion
| Question | Answer |
|---|---|
| What is motion? | An object’s change in position relative to a reference point. |
| How do you know when you are in motion? | Because you see other objects pass by. (This is the reference point.) |
| A force must cause a change in _____. | Motion. |
| What is force? | Any push or pull in a particular direction. |
| When you push an object, the force is in the direction of the _____. | Push. |
| When you pull an object, the force is in the direction of the _____. | Pull. |
| What are the four forces found in nature? | Electric, magnetic, gravity, and friction. |
| What is gravity? | The force of attraction between all objects and the universe. (Universal gravitation/ Newton's law of gravity.) |
| The force of gravity between two objects _____ as the distance between them increases. | Decreases. |
| When a shuttle leaves Earth's atmosphere, gravity _______. | Weakens. |
| Why do the planets orbit the sun? | Because the sun has the greatest gravitational pull. |
| The farther away a planet is to the sun, the _____ the gravity. | Weaker. |
| The amount of gravitational pull depends on the ______- of an object. | Mass and density. (Mass increases, gravity increases.) |
| Your ______ never changes. | Mass. |
| Your weight on the moon is -/6 your weight on Earth. Your weight on Jupiter is -.-3 times as much on Earth. | 1, 2.5 |
| What is friction? | The force that opposes the motion of an object. |
| What is friction caused by? | When two things rub together. |
| What does the initial force (F) keep the object doing? | Moving. |
| The force of friction (f) acts in the _____ direction. | Opposite. |
| What would happen without friction? | An object would not be able to slow down. |
| Too much friction causes metals to _____ _____ and over _____. | Wear out, over heat. |
| Do all objects fall in different speeds in outer space? | No, all the same speed. |
| What are the three types of friction? | Rolling, Sliding, and fluid. |
| Sliding is friction involving ______. | Solids. |
| Rolling is friction involving a ______. | Wheel. |
| Fluid is friction with ______ and ______. | Liquids, gases. |
| What is air resistance? | Friction involving air. |
| What are two ways to reduce friction? | Add wheels, lubricants. |
| What are two examples of lubricants? | Oil and wax. |
| What is inertia? | The tenancy for an object to stay at rest or in motion. |
| When the engines on a spacecraft are turned off, it will go through space at the same _____ and ______. | Speed, direction. |
| Does your body have inertia? | Yes. |
| The more massive an object, the _____ inertia it has. | more. |
| Bowling bass are made heavy because they are difficult to ____. | Stop. |
| What is momentum? | The measure of how difficult it is to stop an object. |
| What is Newton's first law? | That an object at rest wants to stay at rest and an object in motion, wants to stay in motion. Unless stopped by an unbalanced force. |
| An unbalanced force can change the _____ or/and ______. | Speed, direction. |
| What are balanced forces? | Forces that are equal in size but opposite in direction. |
| What are unbalanced forces? | Forces that are not equal in size/direction and cause a change in motion. |
| What are the four forces of the airplane? (In order.) | Lift, Thrust, Weight, Drag. (Lemons Throw Watermelons Drastically) (To lift, drag must be greater) |
| What is speed? | Distance traveled within a certain amount of time? |
| Speed= _____ divided by ______. | Distance, time. (Distance is on top of the triangle.) |
| Meters= _____ (unit) | m/s |
| km= ______ (unit) | km/hr |
| Miles= _____ (unit) | M/hr |
| What is the independent variable? | Time. |
| What is the dependent variable? | Distance. |
| What is constant speed? | A speed that doesn't change. (Distance divided by time .) |
| Average speed= total _____ divided by total _____. | Distance, time. (Only up to where the bar reaches.) |
| When riding a bike, ______ is the unbalanced force. | Pedaling. |
| What is acceleration? | A change in speed. |
| Slowing down is _____ acceleration or ______. | Negative, deceleration. |
| What is Newton's 2nd law? | An object acted upon by a force will accelerate in the direction of the force. |
| The greater the force, the _____ acceleration. | More. |
| The greater the mass, the more ____ needed to accelerate the object. | Force. |
| As the force increases, acceleration ______. | Increases. |
| Force= _____ x _______ | Mass, Acceleration. |
| Force= _____ (unit) | Newtons. |
| Mass= ______ (unit) | Kilograms. |
| Acceleration= _____ (unit) | meters/s, m/s2 |
| What is velocity? | Speed in a particular direction. |
| If two velocities are in the same direction, you _____ them. | Add. |
| If two velocities are in opposite directions, the label on the answer should be in the direction the _____ is going. | Person. |
| Velocity= ______ divided by chosen _____-. | Distance, time. |
| Do forces always act in pairs? | Yes. |
| What is Newton's third law? | For every action force, there is an equal and opposite reaction force. |
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emarciante