P1.5 Forces (Alex)
effects of forces
Turning effect
centre of mass
pressure[N/m]
what is a centre of mass
The center of mass is a position defined relative to an object or system of objects. It is the average position of all the parts of the system, weighted according to their masses.
How can we find the centre of mass of any object or system?
The center of mass is the point at which the mass of an object is concentrated. For this reason, it is used for calculations on the effect of forces and torques on an object. It is the point around which the object will rotate if subjected to torque forces. Center of mass is calculated using a reference point outside of an object and the mass of the object at different distances from that reference point.
A force acting on an object may cause the object to change shape, to start moving, to stop moving, to accelerate or decelerate. When two objects interact with each other they exert a force on each other, the forces are equal in size but opposite in direction.
Conversion of pressure = newton per square meter is pascal force per area unit units - psi = pounds per square inch - sengpielaudio Sengpiel Berlin. The SI unit of the pressure is the pascal with the formula sign Pa. 1 Pascal is equal to the pressure of 1 newton per square meter. 1 Pa = 1 N / m2 ≡ 1 kg / m.
the formula of pressure
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The formula for pressure is
P = F/A
In this equation, P stands for pressure while F stands for force and A stands for area. Pressure is typically measured in a unit called the Pascal.
So what this means is that the amount of pressure that is exerted on an area is determined by the size of that area and by the amount of force that is pressing against it.
Therefore, if you have a given amount of force, you will have more pressure if it presses down on a small area than if it presses down on a large area.
If a body under the action of a net external force is allowed to rotate about a pivot, the body will tend to turn in the direction of the applied force.
Examples of turning effect of force:
A person pushing a swing will make the swing rotate about its pivot.
A worker applies a force to a spanner to rotate a nut.
A person removes a bottle’s cork by pushing down the bottle opener’s lever.
A force is applied to a door knob and the door swings open about its hinge.
A driver can turn a steering wheel by applying a force on its rim.