Forces in Balance Flashcards
Revsie
What is a vector
A quantity with direction and magnitude
What is a scalar
A quantity with only magnitude
Example of a scalar quantity
Mass
Speed
Distance
Example of a vector quantity
Weight
Velocity
Displacement
What is the formula for weight
Weight(Kilograms) =Mass (Newtons) x Gravity (9.8)
Definition of weight?
A force exerted on a body by gravity
What is Newtown third law?
When objects interact they exert equal and opposite forces on each other
Newton’s first law?
An object will not change its motion unties acted on by an unbalanced force (if its at rest it will stay at rest but if in motion it will remain the same velocity unless something else moves it)
What is a moment?
Turning effect of a force
What is the equation for moment?
Moment(Nm)=Force (N) x Perpendicular distance from the pivot to the line of action of the force (m)
Why are levers used to exert force?
They amplify the force applied to it and make it stronger as a sort of multiplier
Why are gears used?
To increase or decrease power from somewhere by changing the distribution of the power for different scenarios
What is the centre of mass of an object?
A point where the centre of mass appears to act (can be assumed)
What does it mean when a force is in equilibrium?
There is no resultant force as all of them equal to zero.
What is meant by resolving a force?
Splitting it into two perpendicular components with no effect on each other (e.g a diagonal upwards force is a combo of an upwards and sideways force acting together)
