Forces and their Effects

what is a force?

A force is either a push or a pull that one object exerts on another object

what is contact force?

 Forces that result from direct physical contact between objects, such as friction, tension, air resistance and normal contact forces

state two types of friction forces?

1-static friction

2-kinetic friction

what is tension force?

Tension is the pulling force transmitted through a string, rope, cable, or any similar object when it is pulled tight by forces acting from opposite ends.

what is normal force?

 Normal force is the force exerted by a surface that supports an object in contact with it, perpendicular to the surface.

what is air resistance?

Air resistance is a frictional force acting on an object moving through the air.

what are non contact forces?

Forces that act at a distance, including gravitational, electrostatic,nuclear and magnetic forces.

what is gravitational force?

The force of attraction between any two masses in the universe.

what is electrostatic force?

The force between electrically charged objects

what is magnetic force?

The force exerted between magnets or between a magnet and a magnetic material.

what are nuclear forces?

Forces that act within the nucleus of an atom.

state newton’s first law

Every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it.

state newton’s second law

When a resultant force acts on an object of a constant mass, the object will accelerate in the direction of the resultant force. The product of the mass and acceleration of the object gives the resultant force.

state newton’s third law

Every action has an equal and opposite reaction.A force is either a push or a pull that one object exerts on another object. It can produce, slow down, speed up or stop motion or change its direction.

what is centre of mass?

 The center of mass of an object is the point at which the weight of the object acts

what is moment?

 turning effect of a force about a point

state the principle of moments

For an object in equilibrium, sum of clockwise moments = sum of anticlockwise moments so the net (resultant) moment becomes 0.The sum of forces in one direction must equal the sum of forces in the opposite direction.

what are leavers?

A lever is a simple machine consisting of a rigid bar (lever arm) that pivots around a fixed point called the fulcrum.

what are gears?

Gears are toothed wheels that transmit rotational motion and torque from one part of a machine to another.