Year 8 Physics - Electricity Flashcards
What is the formula for working out the amount of work done?
work hone (J) = Force (N) X Distance Moved (M)
What is the formula for fluid pressure?
Fluid Pressure (N/Meter squared) = Force (N) over Area (Meter squared)
How can a bird diving through water can be in equilibrium?
The drag (water resistance) cancels out the weight of the bird. The bird travels at a steady speed through the water.
What does friction do?
Friction slows things down by making surfaces rub against each other and sometimes it stopping objects from moving.
What factors can affect the size of the size of friction?
Surface roughness, the amount of force, Contact area between surfaces and Nature of materials in contact
What factors can affect the size of the size of drag?
Object’s shape and size, Speed of motion, Density of the fluid (e.g., air or water) and the Surface roughness of the object
How do forces deform objects?
Forces deform objects by applying pressure or tension, depending on force direction.
How do solid forces surfaces provide a support force?
Solid surfaces push upward, balancing objects’ downward force, keeping them stable and supported.
What’s Hooke’s Law?
Hooke’s law is when stretching a string it increases its length proportionally to the force until it can’t stretch further.
How do you use Hooke’s Law?
Stretch a spring, measure extension when adding force. Extension increases with force until spring’s limit.
What does linear relationship mean?
A linear relationship means when one thing changes, the other changes in a consistent way, like walking at a steady pace.
What does it mean by moment?
Moment means the turning effect of a force.
What’s the formula for moment?
Moment (Nm) = Force (N) X Perpendicular Distance from pivot (M)
How do fluids exert a pressure in all directions?
The tiny particles move and collide.
How does liquid pressure change with depth?
Liquid pressure increases with depth due to more weight above.
