Physics Term 1 Forces + Telescope thing Flashcards
(14 cards)
What are the different types of forces?
Gravitational, Normal/Contact, Friction, Air resistance or drag, Up thrust, Magnetic, Electrostatic, Tensional, Applied, Spring.
Why do we put telescopes in space and not on Earth?
This allows us to get a lot more clearer image of the Earth with no refraction and there is no gas in the way in space.
What is a resultant force?
When 2 or more forces act on the same objects, their effect is to combine into a single resultant force.
What is Newton’s first law of motion?
1st law- An object in motion stays in motion until acted upon by an unbalanced force.
What is Newton’s 2nd law of motion?
Object will only accelerate if an unbalanced force acts on them. The size and direction of this acceleration is dependant on the size and direction of the force.
F = MA
(Force = Mass * Acceleration)
What is Newton’s 3rd law of motion?
Every action has an equal and opposite reaction.
What is inertia?
This is how much an object wants to stay at rest. For example the more inertia it has the more it wants to stay in its certain state.
What is Ohm’s Law?
V = I * R
(Voltage = Current * resistance)
It might be easier to think of it as V = C * R
What is a free body diagram?
It is a diagram that describes how an object is moving. You must always start drawing it at the centre of mass.
What is a force and what is it measured in?
It is a push or a pull measured in “N”. with a newton meter.
What is gravity?
Attracts a body towards any other physical body having mass.
What is speed?
Speed is the rate at which an object covers a distance. It is a scalar quantity meaning it shows mass and not direction.
What is velocity?
It is speed and direction measured in m/s but you have to specify what direction.
E.g. 10m/s northeast.
What is the Speed diagram?
D = S * T
(Distance = Speed * Time)
