Gravity Flashcards
The more mass an object has…
the greater its gravitational field will be.
What force is wait
Weight is a non-contact force
Gravitational field strength (g) is measured how?
in newtons per kilogram (N/kg).
What is the centre of mass for all objects on earth
The centre of gravity
Equation for weight
Mass x gravity =10
weight(N) = mass(kg) × gravitational field strength(N/kg)
Equilibrium
Moments are equal
When is work done
Work is done when energy is transferred from one store to another. Work is also done when a force causes an object to move.
What happens when work is done against frictional forces acting on an object?
the object’s temperature increases.
Calculating work done
work done = force × distance
Note that one joule of work is done when …
a force of 1 N causes a movement of 1 m.
free body diagram
A simplified drawing of an object or system showing the forces acting on it. The forces are shown acting away from the centre of a box or dot.
How do you find a resultant force?
Two forces can be added together to find a resultant force
component force
One of two forces, at right angles to each other, that can be added together to form a resultant force.
Vector diagrams
Vector diagrams can be used to resolve the pulling force into a horizontal component acting to the right and a vertical component acting upwards.
What is the center of mass of an object
The centre of mass of an object is a point where the mass can be thought of as being concentrated
