Chapter 3 and 4 - Motion and Forces Flashcards
What does the gradient represent on a distance-time graph?
Speed
What is acceleration?
The rate of change of velocity
What does the gradient represent on a velocity-time graph?
Acceleration
What does the area under a velocity-time graph represent?
Displacement
What is 1N?
The force required to accelerate a 1kg object by 1ms^-2 in the direction of the force
What is an object’s centre of gravity?
An imaginary point where the entire weight of the object appears to act.
What is the principle of moments?
For a body in rotational equilibrium, the sum of the anticlockwise moments about any point is equal to the sum of the clockwise moments.
What does it mean when an object is in equilibrium?
The object’s net force and net moments is 0.
What is a couple?
To equal and opposite forces that are parallel acting on the same object.
How do you find the torque of a couple?
magnitude of one of the forces x the perpendicular distance between them
State Archimedes’ principle
The upthrust acting on an object is equal to the weight of the fluid displaced by the object
