Non-contact forces
Independent and Dependent Variables
Electromagnets
Motors
100

What is a non-contact force

#3 A force that can cause creates a push or a pull without touching it. 

100

What is an independent variable 

#1 What the scientst is testing, what the scientist is changing

100

What are three parts to an electromagnet?

#6 Battery, copper wire, nail

100

What are the parts to a motor?

#9 An electromagnet (battery, copper wire, paperclip) and a permanent magnet

200

What happens to the strength of the magnetic field or static elecrtical field when the distance between the magnetis DECREASES?

#27 It is stronger bc it is closer.

200

What is a dependent varibale?

#2 What the scientist measures, the DATA collected. 

200

What is the difference between a parmanent magnet and an electromagnet?

#7 A permanent magnet always has a magnetic field. An electromanget is a temporary magnet. 

200

What are motors used for?

#9 We put them in items to make them move/power them. Cars, remote control toys, fans, household appliances. 

300

Draw two magnets repelling each other

Draw two magnets attracting each other

24

300

In an experiment testing the number of wire turns on a nail and the number of paperclips it picks up. What is the independent variable and what is the dependent variable?

#19 Independent- number of coils (what the scientist is changing)

Dependent- number of paperclips picked up- data collected to measure strength. 

300

How can a student test which electromagnet is stronger?

#15 Which one picks up more paperclips. 

300

How are motors different than generators?

#8 Generators generate electricity. Motors power appliances/make things power on. 

400

What are three examples of non-contact forces that we have learned about?

#3. Magnetism, electricity, and gravity

400

What is the independet variable? Dependent variable? 

1. Place a 20 kg cart at one end of a 30 m hallway 

2. Apply a force to the cart 

3. Measure how far the cart moves before it stops rolling. 

4. Repeat steps 1-3 using different amounts of force each time. 

5. Create a graph of the amount of force used and distance achieved by the cart for each test. 

Independent: differerent amounts of force- what the scientist is changing 

Dependent: distance the car travels- data collected- what is being measured. 

400

What are four ways you can strengthen an electromagnet?

Question 13 on study guide

1) Bigger/more batteries 

2) More coils 

3) Thicker copper wire

4) Closer distance 

5) Bigger nail

400

Explain how a motor works 

#30 A motor works because the magnetic field from an electromagnet and the magnetic field of the permanent magnet are constantly interacting causing the coil to spin/rotate. 

500
Explain how you are able to create static elecrticity?

Remember the charges

You are able to create static elecrticity by using fricition. Take a wool cloth and rub it against the balloon. The elecrtons will be transferred from the wool to the balloon. The wool then has a positive charge while the balloon has a negative charge. The balloon will be able to attract to someone hair. 

500

A student discovered that motors are built on the concept of electromagnets. Motors are used in many of the items found in home, such as electric toothbrushes, ceiling fans, and vacuum cleaners. Since motors use electromagnets, the student decided to build his own. The student constructed a model of a small motor using an electromagnet. The model will be tested to see if it works when a copper wirse is attached to a battery. 

The student looped the copper wire in a circle with the ends straightened out. The paper clips were reshaped and used to hold the wire, and the rubber band was used to hold the paperclips against the battery. 

The student discovered that the copper loop began to spin very quickly. He also discovered that when the magnet on the battery was moved farther away the spinning of the copper loop slowed down. 

The student revised the procedure to make the copper loop spin faster by adding more loops to the copper wire. The student observed that it did spin faster when more loops were added 

Independent= changing the number of coils 

Dependent (data)= speed of the copper wire

500

Why do you need a battery, a nail, and copper wire to make an electromagnet? 

Battery- power source, provides electrons 

Copper wire- conductor- transfers electrons

Nail- ferromagnetic- need something magnetic for the magnet

500

Draw a model of a motor? 

23)

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