P8 Flashcards
Displacement is….
Distance in a given direction
Displacement is measured as
A straight line between two points
A scalar quantity has….
Magnitude only
A vector quantity has…
Magnitude and direction
A scale diagram is used to show
More than one force acting on an object
Force is measured in
Newtons
Newton’s third law
“When two objects intersct with each other they extert equal and opposite forces on each other”
Friction is what type of force?
Contact
Newton’s first law
” If the forces acting on an object are balanced, the resultant force on the object is zero” Is which Law?
If the forces acting on an object are unbalanced the object must be…
Accelerating
Free-body diagrams are used to find….
Resultant force
Resultant Force can be described as
A single force that describes the overall effect on an object
A moment is
The turning effect of a force
Moments can be increased by..
Increasing the force or increasing the distance the force is applied from the pivot
Moment equation
Moment (Nm) = Force (N) x Distance (M)
F1 x D1 = F2 x D2
Moment = Force x Gear Radius
Gears are used to….
Multiply forces
A Low gear gives…
a Low speed and a High turning effect
A High gear gives a…
High speed and a Low turning effect
The Centre of mass of an object is…
The point at which the majority of the mass is concentrated.
A Symmetrical object’s centre of mass can be found by…
Finding the point where the lines of symmetry intersect
For an object that is not turning
The Clockwise and Anticlockwise Moments must be equal
The Parallelogram of forces
The Geometric method for finding the result force of non-opposite forces is
An object at rest is in…
Equilibrium
