Physics: Forces

Physics: Forces

1. is a push or pull

2. is a vector quantity (has magnitude and direction)

3. net/ resultant force refers to the sum of all the forces acting on an object

   • The resultant force also shows the final effect which all the forces have on the object.

4. Types of forces

   • Weight
     • The weight of the body is the force of gravity actin gon the body..
       • Calculated by W=mg (where W=weight, m=mass, g=gravitational acceleration)
     • is not the same as mass (which is a scalar quantity--has only magnitude)
   • Friction
     • is a force that opposes motion, in order to stop the motion.
       • without friction, we wouldn't be able to stop moving!
   • Contact force
     • two objects in contact with each other will exert a force on each other
       • without contact force, objects would sink into each other because there is no force causing pushing the objects away from each other.
       • The force exerted by the objects are actually electromagnetic forces of repulsion between atoms in the surface of the objects, in the microscopic level.
     • Normal contact force is the contact force acting perpendicular to the surfaces of objects.
       • When objects are on a slope, they will slide downwards as the weight of the object acts downwards, while the onctact force acts diagonally.
   • Tension
     • The force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends. The tension force pulls equally on the objects on the opposite ends of the wire.

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