Centre of Mass Flashcards
What will happen to the centre of mass if an object has a uniform shape and density?
The centre of mass will be at the centre of the object.
What is a concentric force?
When a force is applied through the centre of mass of a body.
What happens with an object at a unstable equilibrium?
It tilts and then falls over.
What is true when an object is in equilibrium?
All the forces acting on them are balanced; the sum of all the linear forces equals zero and the sum or all turning forces equals zero.
In which state does the body tend to return to its original position after being disturbed?
A stable equilibrium.
What will happen if a force is applied to an object in equilibrium what will happen?
It will either tilt, tip over or roll.
Which state of motion is is this:
An object such as a ball is applied pressure to and when moved, it rolls.
Neutral equilibrium.
What happens with an object at a stable equilibrium?
It tilts and then falls back into the original position.
Angular motion is caused by which type of force?
Eccentric force.
The ability to maintain balance under unfavourable circumstances is dependent on which factors?
- Size of base of support.
- Relation of the line of gravity to the base of support.
- Height of the centre of mass.
- Mass during movement.
What will happen if an eccentric force is applied to a body?
Then the body will rotate when it moves, the rotation will be around the centre of mass.
What must happen to maintain equilibrium?
The centre of mass must remain within the base of support to maintain equilibrium.
If an eccentric force is applied to a body, angular motion will occur - what is this?
The object will rotate around the centre of mass when it moves.
Does a wide or narrow base of support make stability easier?
Wide base, because it becomes eaiser to keep the centre of mass within the base of support.
What will happen if a concentric force is applied to a body?
Then the body will move in a straight line, causing linear motion.
Which state of motion is is this:
A shoe box is resting on its largest side and is lifted slightly then dropped?
Stable equilibrium, it will move back to its original position because it is in stable equilibrium.
What happens with an object at a neutral equilibrium?
It rolls.
What is an eccentric force?
When a force does not pass through the centre of mass of a body.
In gymnastics, is it easier to maintain balance during a headstand or a handstand and why?
A headstand because it has a larger base of support, the head and two hands rather than only the head.
Which type of equilibrium will the same force create the largest displacement in?
Unstable equilibrium.
What is the difference between a concentric and eccentric force?
A concentric force is applied through the centre of mass whilst an eccentric force does not pass through the centre of mass.
During which state is the body’s centre of mass is neither raised nor lowered, but it stays at the same level when disturbed.
Neutral equilibrium.
T / F:
All objects at rest when they are in equilibrium.
True
Which state of motion is is this:
A shoe box is balancing on its shortest side and a force is applied, the force causes it to become unstable and fall over.
Unstable equilibrium.
