Resultant forces and work done Flashcards
What does a free body diagram show
All the forces acting on an object
In a free body diagram, what does the size of the arrow show
The relative magnitudes of the forces
What does the direction of the arrow show
The direction of the forces acting on the object
What is a resultant force
The overall force on a point or object
How do you calculate the resultant force
If the forces are parallel (all acting along the same line) , the overall force is found by adding those going in one direction and subtracting those going in the other direction
What is the ‘work done’
Work done is the action of a resultant force on an object
To make an object move or to keep it moving, what must be applied to the object
A force
What does the thing applying the force need in order to apply the force
A source of energy e.g. a force
In order to move an object what has a force done
It has ‘done work’
What relationship does ‘work done’ and ‘energy transferred’ have
They are the same thing
What is the formula for work done
Work done (J) = Force (N) x Distance (m)
W
F x s
When is one joule of work done
When a force of one newton causes an object to move a distance of one metre
1 joule = how many newton metres
1 J = 1 Nm
