Flashcards
Forces and Motion
Cards in this deck (18)
- 1AccelerationThe rate at which something speeds up
- 2DeccelerationThe rate at which something slows down
- 3Unit for accelerationMeters per second per second (m/s/s)
or meters per second squared (m/s²) - 4What does 1m/s² (1m/s/s) mean?The object's speed increase by 1m/s every second
- 5What 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
- 6What happens to an object when a force acts on it in the direction it is moving?It begins to accelerate and get faster
- 7How 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
- 8What 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
- 9What happens when a force pushes in the opposite direction of motion?Then the object decelerates and heat is given to the surrounding
- 10When 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
- 11How 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
- 12Why 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
- 13Why do objects moving through air get air resistance?They collide with the air particles in the air
- 14Why 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
- 15What are the forces acting on a falling object?
- 16What is terminal velocity?When an object can not fall any faster so falls at a constant speed
- 17What 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...
- 18What 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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- Force and Motion
- Created by
- Jonathan Brazier · Jun 2020
- Updated
- Jun 14, 2020
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