P1.5 Forces(Benjamin)
Effects of forces
Centre of mass
Pressure
Turnning effect
When two objects touch, their is a contact force
Friction acts in the opposite direction which the object is moving
Air resistance or drag is the force of friction when an object moves through air or water
Upthrust is the upward push of a liquid or gas on an object
The resultant force is the single force that has the same effect as two or more forces
Force: the action of one body on a second body that causes its velocity to change
force=mass✖️acceleration
F=ma
Newton(N): the force required to give a mass of 1 kg an acceleration of 1 m/s2
The greater the mass of an object, the smaller the acceleration it is given by a particular force
Pivot-the fixed point about which the door will turn
Moment- the quantity that tells us the turning effect of a force about a pivot
Equilibrium- when a beam is balanced
Moment of a force- the turning effect of a force about a point
moment of a force= force✖️perpendicular distance from pivot to force
When all of its mass were concentrated at this point, known as the centre of mass
We use a lamina to find the irregularly shaped object's centre of mass
p=F➗A
Pascal
Hooke‘s Law
The extension of a spring is proportional tp the load applied to it, provided the limit of proportionality is not exceeded
F=kx
Pa=N➗m2