Under pressure
Mechanically advantaged
Working hard
Efficiency
Hydraulics
100
The unit of pressure
What is a Pascal
100
The units of mechanical advantage are?
What is NO UNITS!
100
The unit of work
Joules (J)
100
No machine is 100% efficient because of ______.
Because of Friction!!
100
What is the difference between hydraulics and pneumatics?
Hydraulics= liquid under pressure
Pneumatics= gas under pressure
200
A person pushes down on a table with a force of 100 N. If the area of contact between the person's hand and the table is 0.01 m², what is the pressure exerted on the table?
What is 10,000 Pa?
200
What is the mechanical advantage of this hydraulic system?
What is 25
200
The 2 conditions that have to be met for work to be done
1. Force and direction of motion need to be in the same direction
2. Movement has to occur.
200
How can friction be useful?
ex: bike breaks, shoes on gravel, etc.
200
In hydraulics a fluid is considered both ______ and ______.
What is a liquid and a gas.
300
What is the area of a car that touches the road if the car’s weight on that tire is 3072 N and the pressure exerted on the road is 48 Pa?
What is 64 m2?
300
find the Force input of this system
What is 13.16?
300
Work is _____ being done.
Kids are playing tug of war but the game is tied and nobody is winning.
Work is NOT being done
300
You use 82J of energy to pedal your bike, which moves with a kinetic energy of 65 J. What is the efficiency of your bike?
What is 76 %
300
Which is more compressible, gases or liquids
Gasses; liquids can be considered incompressible.
400
How much must a woman weigh (force) if the pressure she exerts while standing on one foot has an area of 0.6 m2 exerts a pressure of 16 Pa?
What is 9.6 N
400
Explain how hydraulic systems give us a mechanical advantage
It allows you to use a small force on the small piston to produce a larger force on the large piston.
400
Work ______ being done
A man pushes a lawn mower and is cutting the grass.
Work IS being done.
400
A pulley system is used to lift a box weighing 200N. If you pull with a force of 300 N, calculate the efficiency of the pulley system.
What is 0.67 %
400
What is pascal's law?
Pressure applied to fluid in a closed system will be transmitted in all directions at the same strength
500
A cyclist applies brakes with a force of 150 N to stop the bicycle. If the pressure on the brake pads is 500,000 Pa and the area of the brake pads is 0.003 m², what is the force exerted by each brake pad?
What is 1500 N
500
To ______ the force on the output piston and maintain a _______ ______, the input piston must move a greater distance.
Increase, mechanical adavantage
500
How much work does an elephant do while moving a circus wagon 2000 cm with a pulling force of 30N?
Work = F x d (2000 cm= 20 m)
Work = 600 J
500
A pulley system is used to lift a load, if the efficiency of the pulley system is 75%, and the input force applied is 200 Newtons, what is the output force of the system?
Efficiency = Output/ input
output = efficiency* input
output = 150N
500
How does pressure relate to depth in fluids?
As depth increases, pressure exerted also increased (think about diving down to the bottom of a pool).