Forces 8.3 Flashcards
(23 cards)
What is friction?
A force opposing the motion of the object caused by the interaction of two surfaces.
What is drag?
Drag is the force slowly something down as it travels through a substance
What is a fluid?
A liquid or a gas.
What is it called when a force changes the shape of an object.
Deformation is when a force changes the shape of an object
When a force squashes an object it is called …
Compression
When a force stretches an object is is called…..
Tension.
Extension is ….
The amount a spring, elastic or bungee stretches
At some point a spring will not go back to its original length this means it has met its …….
Elastic limit
The word equation for pressure is….
Pressure = force divided by area
The equation for force is….
Force=mass x acceleration
If an object is moving and forces balance it will ……….
Continue to move
If forces aren’t balanced
The object is likely to accelerate or slow down
If the resultant force is 0 the forces are
Balanced
How do you calculate the resultant force
To calculate the resultant force you subtract the two forces
What is streamlined
Streamline reduces the drag force acting on an object thereby increasing the speed of the object
A moment is
A moment is a measure of ability of a force to rotate an object about a pivot
Word equation to calculate moment is
Moment = force x distance from pivot
When the pressure is bigger is the force bigger
Yah
When the surface area is bigger the pressure is
Lower
The deeper you go underwater the…….… The water pressure
Greater
Are liquids incompressible?
Yes liquids are incompressible this means the pressure is equal in all directions and they are often used in car brakes
Define Hooke’s law….
It is law that says if you double the force the extension will double
What can reduce friction?
Lubrication
Such as oil
