Moments in mass Flashcards
Complete the statements with these words:
Larger, smaller, unchanged.
A force acts on an object and makes it turn about a fixed point.
1: If the force is increased without changing its line of action, the moment of force is ________ .
2: If the moment is doubled and the perpendicular distance from its line of action to the pivot is halved, the moment is ________ .
3: If the force is reduced and the perpendicular distance from its line of action to the pivot is reduced, the moment is ________ .
1: Larger
2: Unchanged
3: Smaller
When a force is applied to a spanner, is the moment of the force increased or decreased when…
1: Increasing the force
2: Exerting the force nearer the nut
1: Increased
2: Decreased
What’s the equation which links moment, force and perpendicular distance?
M = F x d
What is an object’s centre of mass?
The centre of mass of an object is that point where its mass may be thought to be concentrated.
When a suspended object is in equilibrium, where is its centre of mass?
Directly below it
Complete the statements with these words:
Equal to, greater than, less than
1: They are at the same distance from the pivot at opposite sides. The side Jack is on is lower than the other side. This is because Jack’s weight is ________ than Ahmed’s weight.
2: Jack moves towards the pivot until the seesaw is horizontal. This is because Jack’s moment about the pivot is now ________ Ahmed’s moment about the pivot.
1: Greater than
2: Equal to
Dawn sits on a seesaw 2.50m from the pivot. Jasmine balances the seesaw by sitting 2.00m on the other side of the pivot.
1: Who is lighter- Dawn or Jasmine?
1: Jasmine
Think of an object and how it could be redesigned to make it more stable.
!
If the base of a baby chair was too narrow, why would the chair be unsafe?
When the child is sitting in it, the centre of mass is above the seat. If the base of a baby chair was too narrow and the child was strapped in, the chair would topple over when the child leant sideways too much.
