Simple Machines and Work
Name 2 simple machines
Wheel and axle, screw, pulley, incline, wedge, lever
What is the first stop of the digestive tract?
Mouth
Which organ is responsible for gas exchange?
The lungs
What are the first 2 layers of the atmosphere?
Troposphere and Stratosphere
What is the difference between kinetic and potential energy?
Kinetic is energy in motion and potential is energy stored
What simple machine is used by elevators?
Pulleys
What are the three types of muscle in the body?
Skeletal, smooth and cardiac
What do tendons connect to?
Nitrogen, oxygen, CO2, water vapour, and trace gases
What are the 3 methods of heat transfer?
Conduction, convection, and radiation
How does an incline plane make work easier?
Reduces the force to lift an object
What do ligaments connect to?
Bone to bone
Which organ produces bile?
Stomach
What is the difference between igneous and metamorphic rocks?
Igneous is formed by magma cooling, metamorphic is formed by thermal pressure
State the law of conservation of energy
Energy cannot be created or destroyed only transformed from one form to another
If student A is pushing a box with 10N of force to the left and student B is pushing the same box with 11N of force to the right. What direction would it move?
To the right
What type of muscle lines many organs in the body?
Smooth
Name the 6 main nutrients in the body
Carbs, proteins, fats, minerals, vitamins, water
List the mechanical methods of weathering (name 3)
Ice wedging, abrasion, plants and animals, thermal stress, release of pressure
Explain the energy transfer for a light bulb being turned on
Electrical or chemical energy is transferred to light and heat energy
Calculate the work done when a student lifts a 20 N book 7 meters off the ground
140
What happens in the alveoli?
Gas exchange - O2 diffuses through to blood and CO2 diffuses to the alveoli to be breathed out
How do capillaries aid in gas exchange?
Explain how hurricanes are produced
Warm moist air rises to meet cold air, wind current and the jet stream meet to begin spinning
What happens to energy movement when a TV is turned on?
Energy change - electrical to light, sound, and heat