P8 Flashcards
Displacement
Distance in a given direction
Driving force
Force of a vehicle that makes it move (sometimes referred to as motive force)
Effort
The force applied to a device used to raise a weight or move an object
Force multiplier
A lever used so that a weight or force can be moved by a smaller force
Forces
A force (in Newton’s, N) can change the motion of an object
Free body diagram
A diagram they shows the forces acting on an object without any other objects or forces shown
Friction
A force opposing the relative motion of two solid surfaces in contact
Load
The the weight of an object raised by a device used to lift the object, or the force applied by a device when it used to shift an object
Magnitude
The size or a amount of a physical quantity
Moment
The turning effect of a force defined by the equation: moment of a force (in newton meters, Nm) = force (in newtons, N) x perpendicular distance from the pivot to the line of action of the force (in meters, m)
Newton’s first law of motion
If the resultant force is zero the object stays at rest if it is stationary, or it keeps moving with the same speed in the same direction.
Newton’s third law of motion
When two objects interact with each other, they exert equal and opposite forces on each other
Parallelogram of forces
A geometrical method used to find the resultant of two forces that do not act along the same line
Principle of movement
For an object in equilibrium, the sum of all the clockwise movements about any point = the sum of all the anti clockwise moments about that point
Resultant force
A single force that has the same effect as all the forces acting on an object
