Forces and motion Flashcards
What is mass measured in?
Kilograms, kg
What is weight measure in?
Newtons, N
What is the relationship between mass, weight and gravitational field strength?
Weight = mass x gravitational field strength
W = m x g
What is the relationship between the moment of a force and its perpendicular distance from the pivot?
Moment = force x perpendicular distance from the pivot
The weight of a body acts through its centre of …………
Gravity
Where do you always draw the weight arrow from in an object?
The centre
What is the ‘moment’?
A moment is the turning effect of a force
What are the two things? The magnitude of the moment depends on?
-Distance of the force from the pivot
-Magnitude of the force
What is the relationship between moment, force and perpendicular distance?
Moment = force x distance
What is the Principle of moments for a simple system of parallel forces acting in one plane?
The principle of moments states that when the clockwise moments are equal to the anticlockwise moments a body will be in equilibrium.
How do the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam?
If the distance from the pivot is less on the left hand side it means that the force must be greater to compensate for the larger distance on the right hand side.
