Science revision mind map
- Created by: Inayaf
- Created on: 16-06-20 13:14
View mindmap
- Forces
- Non contact and contact forces
- A force is a push or a pull on an object that is caused by it interacting with something
- All forces are either contact or non contact forces
- When two objects have to be touching for a force to act this is contact force
- Friction air resistance tension in ropes
- If the objects do not have to be touching for a force to act this is non contact force
- Magnetic force gravitational force electrotatic force
- When two objects interact, there is a force produced on both objects
- An interaction pair is a pair of forces that are equal and opposite and act on two interacting objects
- Resultant forces
- A resultant force is the overall force on a point or object
- If you have a number of forces acting at a single point, you can replace them with a single force which is the resultant force
- If the forces all act along the same line (parallel) the resultant force is found by adding those going in the same direction and subtracting any going in the opposite direction
- Work done
- When a force moves on object through a distance energy is transferred and work is done on the object
- To make something move a force must be applied
- The thing applying the force needs a source of energy(fuel or food)
- The force does work to move the object and energy is transferred from one store to another
- To work out how much work has been done; W=Fs
- W=work done(J) F=force (N) s=distance(M)
- Work is done when a force stretches or compresses an object and causes energy to be transferred into the elastic potential energy store of the object
- Gravity and centre of mass
- Gravity attracts all masses but you only notice it when one of the masses is really really big like a planet
- Gravity has two important effects
- On the surface of the planet, it makes all things fall towards ds the ground
- It gives everything weight
- You can think of force as acting from a single point on the object, his is it’s centre of mass
- Forces and elasticity
- To allow an object to stretch, bend or compress you need more than one force acting on the object
- If an object has been elastically deformed it can go back to its original shape and length after the force has been removed.
- To work out the force of something you use the equation F=Ke
- F=force(N) K=spring constant(N/m)e=extension (m)
- There is a maximum force above which the graph curves, showing the extension is no longer proportional to force
- This is known as the limit of proportionality
- If an object has been inelastically deformed it does not. Return to it’s original shape or length after the force has been removed.
- Stretching a spring
- The extension of a stretched spring is directly proportional to the force applied
- The spring constant depends on the material you are using- a stiffer spring will have a greater spring constant
- The equation is F=Ke
- Untitled
- Non contact and contact forces
Similar Physics resources:
Teacher recommended
Comments
No comments have yet been made