Soil
The letter used to classify the top soil horizon.
O
Mechanical energy is the sum of a system's _______ energy & _______ energy.
Potential & Kinetic
The part of a lever on which it pivots is called the _____
Fulcrum
The formula for work is ____
W = F.d
Ice-wedging is an example of this type of weathering.
Mechanical (or physical)
This is what the bottom layer of a soil horizon is called.
Bedrock
The law of conservation of energy tells us _____
Energy cannot be created or destroyed, it can only be transferred from one form to another.
The knee is an example of this class of lever.
1st class
Most machines do not convert all of the energy used into work. Why?
Friction
This is the thickest type of crust, the top of Earth's layers.
Continental
This type of soil is a combination of clay, silt & soil.
Loam
A boy standing on a chair throws a ball in the air. The ball has these types of energy after it leaves his hand.
Kinetic & potential
A screwdriver is an example of this type of simple machine.
Inclined plane
A machine completes work of 100J with an input of 200J of energy. What is its % efficiency?
50%
Efficiency = input/output x 100
= 50/100 x 100 = 50%
Rain is naturally acidic because water absorbs this gas in the atmosphere.
Carbon dioxide
This is the type of soil with the smallest size of grain.
Clay
The SI unit of energy is ____
Joule
I make work easier by changing the direction of the force only. I'm a simple _______
Pulley
What length of slope has the greatest mechanical advantage, long or short?
Long
The formula for IMA of an inclined plane is l/h - the longer the length, the greater the IMA.
What mechanical layer of Earth is said to be semi-plastic?
Asthenosphere
The substratum horizon (weathered parent material) is also known by this word.
Regolith
The wheels of a rollercoaster spark as it moves at 15m/s at the top of a 15m high loop. The 4 different types of energy in this statement are _______
Thermal, radiant, kinetic & potential.
This class of lever has a mechanical advantage of less then 1.
3rd class
Boy A takes 4s to lift a 6N weight 2m.
Boy B takes 2s to lift a 5N weight 1m
Boy C takes 6s to lift a 4N weight 3m
Which one has the most power?
Boy A
Boy A = (6x2)/4 = 3W
Boy B = (5x1)/2 = 2.5W
Boy C = (4x3)/6 = 2W
This acid is found in volcanic acid rain.
Hydrochloric (HCl)
Sulphuric (H2SO4)