Forces assessment revision
- Created by: EllieChall
- Created on: 02-06-20 11:17
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- Forces
- Scalars and vectors:
- Scalar quantities have size or magnitude but direction is not specified. For example: -distance -speed and mass.
- Vector quantities have magnitude and a specific direction. For example: displacement, velocity, force.
- Scalar quantities have size or magnitude but direction is not specified. For example: -distance -speed and mass.
- contact and non contact forces
- Contact forces are forces that act between two objects that are physically touching each other. such as friction, resistance and tension.
- Non contact forces are forces that act between two objects that are not physically touching each other. such as magnetism and gravity
- Static flyer practical equiptment list: Cotton towel, plastic bag, scissors, balloon.
- Static flyer steps: 1-cut off a section from the open end of the bag. 2-blow up a balloon and tie the end. 3- Rub the towel on the balloon 4-Rub the towel on the plastic. 5-Suspend the plastic cover over the balloon and let go
- Newtons third law: 'when two objects interact with each other they exert equal and opposite forces in each other.
- Contact forces are forces that act between two objects that are physically touching each other. such as friction, resistance and tension.
- Work Done
- when a force makes an object move by a distance you can say that work is done on the object. The work is EQUAL to the energy transferred to the object.
- Work done equation:
- Work done= force x distance
- parallelogram and resolution forces
- resultant forces= a single force that has the effect of all forces acting on an object.
- center of mass and gravity
- Weight (N) The weight of an object and the mass of an object are directly proportional.
- weight of an object = weight(n)= mass(kg) x gravitational field strength (n/kg)
- extension of a spring
- there is linear relationship between force and extension. The extension of a sprint is directly proportional to the force.
- By overstretching the spring we have exceeded the limit of proportionality
- Hookes law: force=spring constant x extention Foxes Kill Elephants
- work done: 0.5 x spring constant(n/m) x extension squared (m)
- extention = new length - origional length
- Scalars and vectors:
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