Topic - Energy
What is the word for the ability to do work or cause change?
Energy
What kind of energy does a ball at the top of a ramp have when it is not moving?
Potential energy
What is a force?
A push or pull that change object's location or direction
What is a contact force? Give one example.
Contact force acts by touching — example: pushing a box or any other suitable example
What simple machine would you use to lift a flag on a pole?
Pulley
Name one source of energy that helps you to see every day.
The Sun / sunlight
When light is taken in by a surface and not reflected, it is called:
Absorption
What unit do we use for measuring force?
Newtons (N)
Which of the following is a non-contact force?
A. Friction between shoes and floor
B. Gravity pulling a ball down
B. Gravity pulling a ball down
Which simple machine is a wheel that turns around a center and helps things move more smoothly?
Wheel and axle
When energy moves from one place(location) to another (for example, from a plug to a phone battery), this process is called what?
Energy transfer
Name a material that does not let electricity flow easily
with example
an insulator.
Example: Plastic, rubber, wood, or glass
Name one effect a force can have on an object.
Change its speed, direction, or shape
Lifting a backpack using your arms is an example of which type of contact force?
Muscular Force
Which simple machine is an inclined plane wrapped around a rod? Give one example of where we use it.
Screw
When energy changes from one form to another (like water turning motion into electricity at a dam), this process is called what?
Energy transformation
How does sound travel to your ear?
Answer: As vibrations through a medium like air, liquid, or solid
Why does a skateboard go farther on smooth ground than on bumpy ground?
Because there is less friction on smooth ground
Define Friction in one sentence
Friction is a force that opposes motion when two surfaces touch.
What is Crest and trough?
What is an equilibrium Line in wave?
Crest is the highest point of wave
Trough is lowest point of the wave
It is the middle line or rest position in wave where wave does not move
What happens to potential energy (PE) and kinetic energy (KE) as a roller coaster goes down a hill?
as it goes down PE decreases and kinetic energy (KE) increases, so speed increases.
question 1: What is the name for light bending when it passes from air into water?
question 2: What happens to light when it bounces off a shiny surface?
Answer 1: Refraction
Answer2 : Reflection
what is non-contact force? Give two examples
A force that acts on an object without touching it, such as gravity or magnetism.
Define spring or elastic force in one sentence.
It is the force made when something is stretched or squeezed and tries to return to its original shape
What is an amplitude of a wave tells us?
What is frequency? What is its units?
•Amplitude tells us how strong or loud a sound is.
Frequency(f) is the number of waves that pass a point in one second.
•It is measured in hertz (Hz).