Unit 1: Our Dynamic Universe Flashcards
What is a vector?
A vector quantity is completely described by stating its magnitude and direction
What is the definition of distance?
It is a measure of how far an object has travelled from its starting position (scalar)
What is the definition of displacement?
Quantity describing the distance from the start of the journey to the end in a straight line with a described direction (vector)
What is the definition of speed?
A measure of the time taken to travel a set distance
OR
the distance per unit time (scalar)
What is the definition of velocity?
The rate of change of displacement per unit time (vector)
What is the definition of acceleration?
The rate of change of velocity per unit time (vector)
What is a projectile?
An object moving horizontally and vertically at the same time. It is an object undergoing unpowered flight
What is a force?
A push or pull acting on an object (vector)
State Newton’s first law
An object will remain at rest or continue at a constant speed in the same direction unless acted upon by an unbalanced force
State Newton’s second law
If the forces acting on an object are unbalanced the object will accelerate
Acceleration is directly proportional to the unbalanced force and inversely proportional to the mass
State Newton’s third law
If A exerts and force on B, B exerts and equal but opposite force on A
What is the definition of mass?
The quantity of matter in an object
What is the definitional of the gravitational field strength?
The weight per unit mass
What is the definition of weight?
The measure of the force due to gravity acting on a mass. It is a downward force and is a vector quantity.
What is the definition of apparent weight?
A measure of the upwards force acting on an object
