23670649
Description
Flashcards by Jonathan Brazier, updated more than 1 year ago
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Created by Jonathan Brazier
almost 4 years ago
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| Question | Answer |
| Acceleration | The rate at which something speeds up |
| Decceleration | The rate at which something slows down |
| Unit for acceleration | Meters per second per second (m/s/s) or meters per second squared (m/s²) |
| What does 1m/s² (1m/s/s) mean? | The object's speed increase by 1m/s every second |
| What does a straight line tell you on a speed time graph? | It is moving at a constant acceleration. If it is sloped up it is accelerating faster. If it is going down it is decelerating. If it is flat it is going at a constant speed. A curve means the acceleration is gradually increasing or decreasing |
| What happens to an object when a force acts on it in the direction it is moving? | It begins to accelerate and get faster |
| How is the force pushing it and the acceleration related? | The larger that force the larger the acceleration. Acceleration is directly proportional to the force pushing it |
| What does a graph with Acceleration of an object and the amount of force pushing that object look like? | It will be a straight line through the origin because of the direct proportion |
| What happens when a force pushes in the opposite direction of motion? | Then the object decelerates and heat is given to the surrounding |
| When you push something and let go why does it slow down? | Because when you let go then the other forces that were acting on the object in the other direction that weren't as powerful as your pushing force suddenly go into affect as they become more powerful than the forces pushing the object so can slow it down |
| How do we stop moving vehicles? | We create a lot of friction on the wheels with brakes which makes quite a lot of force in the opposite direction of motion |
| Why do we stop moving vehicles over a long time? | The slower we stop them the gentler it is for the human inside. If you were to go from a high speed to completely stopped really quickly it would exert quite a few G's on the human inside which isn't good for them |
| Why do objects moving through air get air resistance? | They collide with the air particles in the air |
| Why does larger surface area and speed mean more air resistance? | Larger surface area means you hit more air particles and faster speed means you go through more air every second so therefore hit more air particles |
| What are the forces acting on a falling object? | |
| What is terminal velocity? | When an object can not fall any faster so falls at a constant speed |
| What causes terminal velocity? | The air resistance becoming so high that the object can't get any faster without the air resistance slowing it down and decreasing the air resistance meaning it speeds up and the air resistance increase again... |
| What energy transfers are there at terminal velocity? | The kinetic store remains the same but the gravitational store is transferred to the surrounding's kinetic stores |
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