Week 3: Slides

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Week 3: Slides and Forces 


Big Question:

What affects a rider's speed down a slide? 

independent variable: steepness or weight 

dependent variable: speed




Thursday Lecture Edited:

    We began lecture by completing a warm up question on the go cart test run. We learned to look at the graph based on where you are at a specific time, the position in relation to time is important. We then went over what we completed in lab, our slide investigations. Rather than describing and predicting motion like we did last week, this week we are going to investigate why and how things move. We graphed a position vs time graph showing acceleration. Acceleration is change in velocity over time. We know that riders accelerate while going down a slide, the higher the slide the more time the rider has to speed up. We looked at a graph of an object going down a slide a long slide. In the beginning of the slope the object moves very little in the first tenths of seconds. The more time it moves the faster the object moves down the slide, this is called acceleration. Acceleration is speeding up or slowing down. 

Acceleration = change in velocity(speed)/ time, how quickly it is moving/how quickly it is changing over time. 

Speed explains how fast you are going, velocity is the direction and speed that you are moving in. The higher the slide the more time the rider has to gain speed. Acceleration can be speeding up, slowing down, or changing direction. 

    We then looked at the force lens on motion. Force is a push or pull, objects accelerate because of force like gravity. Force is required for objects to move. Forces have a size and direction, they can be represented by using arrows. Objects accelerate in the direction of the force acting on them. When you have a steep table or slide, it cancels less gravity than a flat surface like a table. When the slide is less steep, gravity is pulling you into the slide and the slide is slowly pulling you down. When the slide is steep, gravity is pulling you down and the slide is pulling you down at an accelerated rate. The steeper the slide the more it is aligned with gravity. 



        Friction is a force and opposes sliding. The amount of friction depends on the surfaces, and how hard the surfaces are being pushed into each other. In order to stay put on a surface there must be friction involved. A magnet on a fridge is considered friction, gravity wants the magnet to slide down but friction opposes that pull. 



    Rider weight does not matter, gravity affects all objects the same. 

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