1/26 - 8th Science - Spiral Review

Two factors that affect gravity

• mass and distance
• types of surfaces and how hard they are pushed together
• force and distance
• mass and direction

For every _______ there is an equal and opposite ________. 

• reaction, action
• action, action
• reaction, reaction
• action, reaction

The tendency of an object to resist change in its motion is known as

• mass.

• inertia.

• force.

• balance.

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

Match the following

• It is used in thermal imaging

• Radio waves

• Has the highest energy of all electromagnetic radiation and is the most damaging to human tissue

• Microwaves

• Overexposure to this can result in sunburns and skin cancer

• Infrared rays

• Has the longest wavelengths and the lowest frequency

• Gamma Rays

• Used in cell phone communication and police radar systems

• UV rays

How do these waves compare?

• wave 2 has a higher frequency than wave 4

• all have the same frequency

• all have the same wavelength

• wave 3 has a longer wavelength than wave 4

When a student runs and kicks a ball, they have applied an ___________ force to move the ball.

• Balanced

• Magnetic

• Spring

• Unbalanced

Which body has the greater effect on Earth's tides?

• Sun

• Mars

• Moon

• Mercury

Why does the moon's gravitational pull have more of effect on tides than the sun's gravitational pull?

• they are the same
• the moon is larger than the sun
• tides are not caused by the moon
• the moon is closer to the Earth than the sun

What type of tides would this arrangement of earth-moon-sun create?

• neap tide
• spring tide
• new moon tide
• full moon tide