Further Mechanics Flashcards
What is angular speed?
What is it measured in?
The angle an object moving with circular motion rotates through per second.
Rads^-1
Centripetal force?
The resultant force on an object that is towards it’s centre, allowing the object to move in a circle
Are angular speed and linear speed constant?
Angular speed is constant provided the angle stays the same but linear speed changes either: the further away from the further away from the centre of of motion or when it moves due to direction changing and velocity being a vector.
What is linear velocity?
The velocity of the object has as it moves around the circumference of the circle
What is centipetal acceleration?
The acceleration of the object acting towards the centre of rotation as the direction of the object changes
How does the nature of the centipetal force change?
Varies according to the system being studied.
When does the force feel heaviest?
At the bottom of the circle is the constant force must support both weight and pull the object out of the horizontal path.
What changes due to circular motion?
Speed does not change Velocity only changes direction Kinetic energy doesn't change Momentum only changes direction Centipetal force/acceleration doesn't change, is constant towards the centre as no work is done.
What is the conservation of momentum?
Newtons third law shows that the forces on A and B when collide must be equal. Newtons second law shows the forces cause A and B to accelerate
What is the principle of momentum?
The total linear momentum of any system of interacting bodies on which there is no external forces are acting must remains constant
What is an inelastic collision?
Where kinetic energy isn’t conserved
What is a completely inelastic collision?
Where bodies stick together on impact?
What is an elastic collision?
A collision where kinetic energy is conserved.
What is the area under a force - time graph?
It is the impulse (vector quantity) or the change in momentum
What are the conditions for SHM?
Acceleration is proportional to the displacement from the equilibrium position for a constant mass.
Acceleration always acts towards the equilibrium position/ apposes displacement
