lesson one

Question 1

how do we sense heat?

Answer 1

thermoreceptors in our skin

Question 2

how do the nerves communicate with the brain(3 steps)?

Answer 2

1. skin(thermoreceptors) sends electrical signals to the brain along the sensory nerves
2. hypothalamus in brain decides how to react
3. • sweat to lose heat
   • shiver to make heat
   • go red by dilating blood(lose heat)
   • move away from heat

Question 3

what if it’s a lot of heat

Answer 3

skin receptors to sensory neuron to spinal chord. meaning hand will move away before the brain has the information about the event

Question 4

types of burn

Answer 4

heat
friction
cold
combust(chemical change)

Question 5

descrive brownian motion

Answer 5

small particles like pollen and dust randomly change direction

Question 6

what does brownian motion show us?

Answer 6

the water/air that suspends the pollen/dust must contain particles in constant random motion

Question 7

the kinetic theory of matter

Answer 7

everything is made of particles that are constantly moving.
when heat is applied, objects expand due to increased movement of the particles. –> more collisions so the particles in a solid move apart(SAME SIZE STILL) and become a liquid. more –> gas

Question 8

heat energy

Answer 8

the total amount of energy of al the particles in a substance

Question 9

temperature

Answer 9

proportional to the average kinetic energy of the particles

Question 10

exlpain questions

Answer 10

1. what is the physics theory/law/equation?
2. how does that explain the phenomenon?
3. what is the consequence in this context?

Question 11

how de we burn?

Answer 11

cell membranes can be burst by expanding contents

Question 12

thermal expansion scaffold

Answer 12

• as a substance is heated, particles in the substance vibrate faster and need to take up more space, causing the substance to expand(and if container can be pushed outward, will expand)
• the ______ expand bc (heat source)
• consequence e.g. good/bad/useful bc …