Question by spiderpig: I NEED HELP ON SCIENCE PLEASE HELP ME?
4. The energy that is released in motion of a system is called: (1 point)
potential energy
kinetic energy
translational energy
formational energy
For questions 8–11, identify which type of simple machine each of the following objects represents.
8. door on a hinge (1 point)
wheel and axle
pulley system
wedge
screw
lever
9. bottle opener (1 point)
wheel and axle
pulley system
wedge
screw
lever
10. roller skates (1 point)
wheel and axle
pulley system
wedge
screw
lever
11. screwdriver (1 point)
wheel and axle
pulley system
wedge
screw
lever
Sound is ___. (1 point)
a drop in air pressure
a vibration of molecules
an increase in temperature
17. Which part of the human ear vibrates to receive sound? (1 point)
outer cortex
inner canal
eardrum
cranial nerve
18. Which of the following statements is true about sound? (1 point)
it requires a medium
it can travel in a vacuum
it is not a wave
it does not have a frequency
19. Sound with a high frequency also has
(1 point)
a long wavelength
a short wavelength
a high amplitude
a low amplitude
20. Who is often credited for the discovery of electricity? (1 point)
Thomas Edison
Benjamin Franklin
Albert Einstein
Democritus
21. The term static in static electricity means (1 point)
flowing electrons
flowing protons
non-moving build up of charge
discharge of electrical build-up
22. Electricity is the flow of which subatomic particles? (1 point)
electrons
protons
neutrons
23. Static electricity causes socks to stick together in the dryer, and a charged balloon to stick to the wall. Why does this happen?
(1 point)
like charges attract
like charges repel
opposite charges repel
opposite charges attract
24. Which of these phrases best describes lightening? (1 point)
a discharge of protons that cools the surrounding air
a discharge of electrons that heats the surrounding air
a discharge of protons that heats the surrounding air
a discharge of electrons that cools the surrounding air
25. An electrical current will travel through a metal. Metals are ____. (1 point)
conductors
insulators
carbon grids
silicon chips
26. Rubbing your feet across the carpet or a balloon across your hair will transfer a charge. Which of these statements best explains why this takes place? (1 point)
protons are found in the outer areas of the atom and may be removed by rubbing materials together.
the highly charged electron remains tightly bound in the nucleus and provides a static charge
electrons are found in the outer areas of the atom and may be removed by rubbing materials together
protons of the nucleus are easily transferred between materials
27. A build up of negative electrical charge is (1 point)
AC power
DC power
nuclear electricity
static electricity
Best answer:
Answer by Leena Gill
4.) Kinetic
27.) Static
26.) Electrons are found
25.) Conductors
What do you think? Answer below!