Magnetic Forces and Motion

Students complete and experiment using a different number of magnets to pick up paper clips. The students recorded the number of paper clips the magnets collected. Which sentence best explains the results of the experiment?

• Two magnets pick u more paper clips than one magnet.
• Three mgnets pik up less paper clips than two magnets.
• The more magnets used the less paper clips were picked up.
• The fewer magnets used the more paper clips were picked up.

A student investigates how magnets work. The student plans to explore the function of magnets by placing them in different positions. Look at each magnet set-up. Which one would result in all magnets being attracted to each other?

• 
• 
• 
• 

Which tools can be used to test for a magnetic field and why?

• A ruler because it can provide a distance
• A battery because it can turn on a light bulb
• A compass because it can direct you towards north
• A thermometer because it can tell you when the air changes

Magnets have north and south poles. Which systems show magnets that will repel each other?

• System 1 and System 2
• System 2 and System 3
• System 3 and System 4
• System 4 and System 1

A magnet was tested to see if it could attract iron screws. The magnet was placed at three different distances from the screws. The table shows the results of the test. Why did the magnet attract the screws only from Trial 3?

• The magnet changed strength.
• The magnet did not always attract iron.
• The screws were different sizes in the other trials.
• The magnet was too far from the screws in the other trials.

The image below shows a horseshoe magnet. Which set of magnets will be attracted to the top (south) pole and bottom (north) pole of the magnet?

• 
• 
• 
• 

A student wants to play a trick on their little brother to make it look like magnet is floating. The student uses circular magnets with a hole in them on a plastic rod. Which diagram shows how the magnets should be placed in order for the trick to work?

• 
• 
• 
• 

A student thinks that the rock found in a park contains iron. Which experiment could the student perform to determine if this is true?

• Place the rock in water. If the rock sinks, then it possibly contains iron.
• Place the rock in vinegar. If the rock bubbles, then it possibly contains iron.
• Place the rock in front of a light source. If the rock sparkles, then it possibly contains iron.
• Place the rock next to a magnet. If the rock is attracted to the magnet, then it possibly contains iron.

A student has to place photographs on the metal door of a cabinet. The student has to follow these instructions. -The photographs cannot be damaged. -The metal door of the cabinet cannot be damaged. -It should be easy to change the position of the photographs. The student uses the information in this table to choose a tool. Based on the evidence, which tool is the best to use?

• nails
• tape
• magnets
• glue

The local landfill wants to develop a plan to sort different types of recyclable materials. What is the best tool that could be used to pull out items made of metal?

• A giant battery
• A giant magnet
• A giant compass
• A giant light source