Speed / Momentum / Force / Work Done Flashcards
What is a scalar quantity?
A quantity with a magnitude only
What is a vector quantity?
A quantity with a magnitude and direction
What is a contact force?
When two objects are physically touching
What is a non-contact force?
Objects are physically separated
How do you measure the weight of an object?
Weight - gravitational field strength x mass
What is the centre of mass?
The point at which an object is thought to be concentrated
What is the resultant force?
The final force acting on an object when all other forces are taken into consideration
What is newtons first law?
Objects that are in motion tend to stay in motion, and objects that are at rest tend to stay at rest
What is newtons second law?
Force - mass x acceleration
What is newtons third law?
Every action has an equal and opposite reaction
How do you calculate work done?
Work done - force x distance
What is compression?
Pushing an object together
What is tension?
Stretching an object out
What is hooks law?
The extension of a spring is directly proportional to the force applied, provided its limit of proportionality is not exceeded (elastic limit)
How do you work out force applied?
Spring constant x extension
How do you work out stopping distance?
Thinking distance x breaking distance
How do you work out force?
Mass x acceleration
How do you work out speed?
Distance divided by time
How do you work out momentum?
Mass x velocity
How do you work out acceleration?
Velocity divided by time
What is momentum?
The quantity of motion of a moving object
What is the conservation of momentum?
In an isolated system, momentum remains constant
What are the steps of working out momentum?
Calculate total momentum of both objects, calculate the mass of both objects, then divide the total momentum by the total mass
