science - waves and forces

Question 1

name the parts of this wave

Answer 1

a = peak

b=trough

c = amplitude

d = wavelength

Question 2

name some types of waves

Answer 2

sound

light

Question 3

what is the difference between a contact and none contact force

Answer 3

a contact force acts at the point between two objects - such as friction. a none contact force doesnt need to touch you - gravity

Question 4

name three types of force used in everyday life

Answer 4

push - used in football

pull - when a dog is on a lead and runs away

twist - when opening a bottle screw cap

Question 5

what is uphtrust

Answer 5

a force that pushes up in water

Question 6

what is the name of given to the unit of force

Answer 6

a newton

Question 7

how fast does sound pass through

solids

liquids

gas

order them and give a reason

Answer 7

solids fastes

then liquids

then gas

more particles means faster waves

Question 8

what is ultrasound

Answer 8

sound higher than 20000hertz frequency

Question 9

what part of the ear detects sound

Answer 9

the eard drum