Dynamics & Space - Definitions Flashcards
Speed
the distance travelled by an object in one second
Velocity
the discplacement of an object in one second
acceleration
the change in velocity in one second
Kinetic Energy
the energy an object has due to it moving, which depends on the objects mass and velocity
Potential Energy
the stored energy of an object when it is lifted a height,h, above the ground
gravitational field strength
the weight of 1kg
Scalar
a quantity with a magnitude (size) only.
Vector
a quantity with direction and magnitude
Balanced forces
the forces acting on an object are equal in size and opposite in direction
Newton’s 1st law
when the forces acting on an object are balanced, the object will remain at rest or continue to move in a straight line at a constant velocity
Newton’s 2nd Law
when the forces acting on an object are unbalanced, the object will accelerate
the object’s acceleration is directly proportional to the unbalanced force acting on it
Newton’s 3rd Law
If A exerts a force on B then B exerts and equal but opposite force on A
Big Bang
a theory for the formation of the universe, which ocured around 13.7 billion years ago
Planet
a celestial body in orbit around the sun with a nearly round shape, which has cleared the neighbourhood around it’s orbit and is not a satellite
Dwarf Planet
a celestial body in orbit around the sun with a nearly round shape, which has NOT cleared the neighbourhood around it’s orbit and is not a satellite
