แผ่นงานLesson 5.17 - Review Electric and Magnetic Forces
คำถามทั้งหมด: 10
Two students hold two objects in place on a flat table. When the students let go of the objects, one object is pulled toward the other object.
What are the two objects most likely to be?
a length of wire and a D-cell battery
a wood building block and an electromagnet
a bar magnet and an electromagnet
two toy trains
Static electricity may form when a material is _____
rubbed
electrons
opposite
Two balloons are each rubbed with a silk cloth and then placed on a wall. One balloon sticks to the wall, while the other balloon drops to the floor.
What are the two most likely reasons for the different outcomes?
Select the TWO correct answers.
Different parts of the balloons were rubbed.
The temperature of the room is unusually warm.
The balloons are made of different materials.
One balloon was rubbed more vigorously or longer than the other balloon.
The balloon that sticks to the wall is heavier than the balloon that fell.
Two tiny metal shavings are 1 centimeter apart. Each shaving has an electric charge of 3 units.
How would changes to the shavings affect the electric force between them?
For each change, select Force Weakens or Force Strengthens.
The charge on one shaving is removed.
Force Weakens
Force Strengthens
Two tiny metal shavings are 1 centimeter apart. Each shaving has an electric charge of 3 units.
How would changes to the shavings affect the electric force between them?
For each change, select Force Weakens or Force Strengthens.
The charge on one shaving is increased to 5 units.
Force Weakens
Force Strengthens
Two tiny metal shavings are 1 centimeter apart. Each shaving has an electric charge of 3 units.
How would changes to the shavings affect the electric force between them?
For each change, select Force Weakens or Force Strengthens.
The charge on each shaving is increased to 5 units.
Force Weakens
Force Strengthens
Two tiny metal shavings are 1 centimeter apart. Each shaving has an electric charge of 3 units.
How would changes to the shavings affect the electric force between them?
For each change, select Force Weakens or Force Strengthens.
The distance between the shavings is increased to 2 centimeters.
Force Weakens
Force Strengthens
Two tiny metal shavings are 1 centimeter apart. Each shaving has an electric charge of 3 units.
How would changes to the shavings affect the electric force between them?
For each change, select Force Weakens or Force Strengthens.
The distance between the shavings decreased to one half a centimeter.
Force Weakens
Force Strengthens
Two small spoons are placed at the same distance from the poles of a bar magnet. One spoon is attracted to the magnet, while the other spoon experiences no magnetic force.
What property must differ between the two spoons?
size
texture
type of material
mass
A drone uses a magnetic compass to find its way. The drone flies near a powerful electromagnet, such as a magnet that lifts scrap metal at a junkyard.
How would the drone most likely be affected?
The drone would fly faster and more accurately.
The drone would stop flying and drop to the ground.
The drone would fly in the wrong direction, and soon crash.
The drone would be pushed away from the electromagnet.
แป้นคำตอบLesson 5.17 - Review Electric and Magnetic Forces
คำถามทั้งหมด: 10
a bar magnet and an electromagnet
rubbed
The balloons are made of different materials.
, d)One balloon was rubbed more vigorously or longer than the other balloon.
Force Weakens
Force Strengthens
Force Strengthens
Force Weakens
Force Strengthens
type of material
The drone would fly in the wrong direction, and soon crash.