Column 1
A student rubs a balloom on their hair. The balloon is then held near small pieces of paper, and the paper moves toward the balloon without touching it. What is the evidence?
A. Magnetic Field B. Electric Field
C. Gravitational Field D. Friction only
B. Electric Field
Which situation demonstrates an electric field?
A. A hand pushing a book
B. A magnet attracting a paper clip
C. A charged balloon attracting pieces of paper
D. A person kicking a soccer ball
C. A charged balloon attracting pieces of paper.
Which variable should be kept constant when investigating the effect of distance on electric force?
A. Distance
B. Charge of the balloon
C. Number of trails
D. Results
B. Charge of the balloon
Which would make an investigation of electric force more reliable?
A. Conducting only one trial
B. Changing several variables at once
C. Repeating trials and controlling variables
D. Ignoring unexpected results
C. Repeating trials and controlling variables
Which statement BEST describes what an electric field does?
A. Electric fields only exist when objects touch
B. A charged object can exert a force on another object without touching it
C. Electric field is the same at any distance
D. Electric field dissapears.
B. A charged object can exert a force on another object without touching it.
Why do small pieces of paper move toward a charged balloon even though the balloon does not touch them?
A. Balloon creates an electric field that exert a force.
B. Balloon creates a gravitational field.
C. Air resistance pushes the paper toward the balloon
D. The paper becomes magnetic.
A. Balloon creates an electric field that exert a force.
A student wants to investigate whether the distance from a charged balloon affects electric force. Which variable should the student change?
A. The type of balloon
B. The size of the object
C. The distance between the balloon and the object
D. The brand of balloon
C. The distance between the balloon and the object
A student holds a charged balloon 2 cm from small pieces of paper and then repeats the test at 10 cm. The paper moves more noticeably at 2 cm. What does this suggest?
A. Electric force can be affected by distance
B. Electric force only exists when objects touch
C. The paper has become magnetic
D. Gravity has disappered.
A. Electric force can be affected by distance
A charged object is moved farther away from another object. The second object moves less. What does this evidence suggest?
A. The object has become magnetic
B. Gravity has stopped acting
C. Distance may affect electric force
D. Electric force requires contact
A. The object has become magentic
A student gets different results during each trial of an electric-field investigation. What should the student do FIRST?
A. Ignore the results
B. Change the conclusion
C. Check the procedure and variables for possible errors
D. Choose the results the student likes best
C. Check the procedure and variables for possible errors
Which observation provides the BEST evidence that an electric field exists around a charged object?
A. The object has color
B. The object has mass
C. Another object moves without touching the charged object.
D. The object remains in one location.
A student says, "An electric force cannot exist unless two objects are touching." Which evidence BEST challenges the student's claim?
A. A charged balloon attracts paper without touching it
B. A student pushes a book across a table
C. A person picks up a pencil
D. A ball rolls after being kicked
A. A charged balloon attracts paper without touching it.
Two objects with similar electric charges are placed near each other. What will most likely happen?
They will repel each other
Which result would provide the strongest evidence that an electric field exists?
A. A charged object remains still.
B. An uncharged object moves toward a charged object without touching it.
C. Two objects touch and move apart.
D. An object falls toward Earth.
B. An uncharged object moves toward a charged object without touching it.
A student records the distance at which a piece of paper begins moving toward a charged balloon. What type of information is the student collecting?
A. Evidence
B. Opinion
C. Prediction Only
D. A controlled variable
A. Evidence
Two objects with opposite electric charges are brought near each other. What will most likely happen?
They will attract each other
Why should a student use the same balloon when testing how distance affects electric force?
A. To make the balloon heavier
B. To keep the charge source consistent
C. To eliminate the electric field
D. To increase the distance
B. To keep the charge source consistent
A student charges a balloon by rubbing it with wool. The student then brings the balloon near another charged balloon. The two balloons move apart without touching. What does this provide evidence of?
A. Electric forces can act without contact.
B. Only contact forces can move objects
C. Gravity is pushing the ballooons apart.
D. The balloons are producing magnetic forces.
A. Electric forces can act without contact
A student changes the distance between a charged balloon and paper and records how many pieces of paper move. What is the dependent variable?
Number of pieces of paper moved
A student changes the distance and the strength of the magnet at the same time. Why is this a problem?
Student can't tell which variable causes the result.
A student tests a charged balloon with pieces of paper but changes the balloon, distance, and size of the paper during every trial. What is the main problem with the investigation?
Too many variables changing at once
A student repeats an electric-field investigation five times and gets similar results. Why does this strengthen the investigation?
Draw the electric current image on the board. Label the battery, lights, and switch. Also draw the arrows in the correct direction.
Student can miss one identifying label to receive credit.
Draw the electric field that would be produced from a negative and a positive charge.
Student was able to label a positive and negative charge and had the correct arrow directions.
A magnet is placed underneath a sheet of paper. A paper clip on top of the paper moves toward the magnet. What does this demonstrate?
Magnetic forces can act through materials (not all) without direct contact.