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What is a reference point?
A fixed place used to determine motion.
What is rectilinear motion?
Motion in a straight line.
Give an example of circular motion.
A Ferris wheel rotating.
What is periodic motion?
Motion that repeats at regular intervals.
A soccer ball rolling on the ground is an example of:
Rolling motion.
A child on a swing moving back and forth is an example of:
Periodic motion.
What type of motion does the Earth around the Sun exhibit?
Periodic motion.
Which of the following represents rolling motion?
A moving bicycle wheel.
What type of motion does a train moving on a straight railway track exhibit?
Rectilinear motion.
Which type of motion does a spinning fan blade exhibit?
Circular motion.
Which of the following is the best conductor of electricity?
Copper wire.
Which of the following is NOT a conductor of electricity?
Plastic.
Which metal is commonly used for electrical wiring?
Copper.
What is a conductor?
A material that allows electricity to flow through.
Which material is a conductor?
Brass.
What is an insulator?
A material that does not allow electricity to pass through.
Which of the following is an insulator?
Plastic.
Which material is used to cover electrical wires for safety?
Plastic.
Which of the following is NOT an insulator?
Steel.
Why are electrical wires covered with rubber or plastic?
To prevent electrical shocks.
What is the electromagnetic spectrum?
The range of all types of electromagnetic radiation.
What part of the electromagnetic spectrum can we see?
Visible light.
An opaque object:
Blocks all light.
A translucent object:
Allows some light to pass through.
What is a transparent object?
Allows all light to pass through.
What is refraction?
Bending of light when it passes through different materials.
Reflection happens when light:
Bounces off a surface.
What is absorption of light?
When light is absorbed by an object.
What happens when light is transmitted through an object?
It passes through the object.
Which of the following supplies energy in a circuit?
Battery.
What is needed to complete a circuit?
Closed circuit.
What happens when a switch is open?
The circuit is incomplete.
What is the purpose of a switch?
To control the flow of electricity.
A series circuit has:
One path for current to flow.
A parallel circuit has:
Multiple paths for current to flow.
What is an electromagnet?
A magnet that works only when an electric current is flowing.
What happens when you turn off the electricity in an electromagnet?
It loses its magnetism.
What is a magnet?
An object that produces a magnetic field.
What are the two poles of a magnet called?
North and South poles.
What happens when two like poles of a magnet are placed together?
They repel each other.
What happens when two opposite poles of a magnet are placed together?
They attract each other.
What materials are attracted to magnets?
Iron and steel.
What is an example of a temporary magnet?
A paper clip that is magnetized.
How can you make an electromagnet stronger?
Increase the number of coils around the core.
What happens when you remove the electric current from an electromagnet?
It stops being a magnet.
What happens if you increase the number of coils in an electromagnet?
It becomes stronger.
Which of the following is NOT attracted to a magnet?
Wooden spoon.
How does an electromagnet differ from a regular magnet?
It works only when an electric current is flowing.
Electromagnets are commonly used in:
Doorbells.
What will happen if you disconnect the battery from an electromagnet?
The magnetic field will disappear.
A light bulb does not turn on in a circuit. What could be the reason?
The wire is broken.
What happens if one bulb burns out in a series circuit?
The other bulbs turn off.
What happens if one bulb burns out in a parallel circuit?
The other bulbs stay on.
Why are parallel circuits used in homes instead of series circuits?
If one appliance turns off, others still work.
What is the purpose of a battery in a circuit?
To provide electrical energy.
What happens when light passes through a convex lens?
It bends inward.
Which of the following is an example of reflection?
Your image in a mirror.
A material that allows some light to pass through but not all is called:
Translucent.
Why do objects appear black in color?
They absorb all colors of light.
What is the main source of natural light on Earth?
The Sun.