Science Milestone

Tyson draws a model to show how the particles in a liquid appear. Which model (or models) above could be Tyson’s drawing of particles in a liquid?

• model 1
• model 3
• model 1 and model 2
• model 1, model 2, and model 3

Match this description to the state of matter.
+/- particles, No shape or volume, Collide violently

• Solid
• Liquid
• Gas
• Plasma

The strength of an electromagnet can be affected by

• changing the current in the wire

• changing the number of loops in the solenoid

• changing the size of the iron core

• all of the above

How do electromagnets differ from regular magnets? 

• A. They  can be turned off and on 
• B. Their polarity can be reversed
• C. Their strength can be changed
• D. All of the above

A student made an electromagnet by wrapping copper wire around an iron nail. The student then connected each end of the electromagnet to the opposite terminals of a battery. The electromagnet will best function as a magnet as long as...?

• electric current flows through the nail.
• electrical energy is transformed into mechanical energy.
• electric current flows through the wire.
• electrical energy is transformed into potential energy.

You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?

• 60 N right
• 10 N left
• 60 n right
• 50 N left

The diagram below shows a skateboarder pushing himself forward with a force of 25 N while the wind pushes back with a force of 5 N. How will the skateboarder be affected if the force of the wind increases to 8 N?

• The speed of the skateboarder will increase.
• The speed of the skateboarder will remain constant.
• The speed of the skateboarder will decrease.
• The skateboarder will come to a stop.

Look at this Distance Time graph.
What is happening at C? 

• constant speed
• stopped
• return home
• deceleration

Look at the Speed Time graph.
What is happening from 0 to A?

• acceleration
• constant speed
• deceleration
• stopped

Which graph represents the greatest acceleration?

• A
• B
• C
• D