Forces & Motion
A change in an object's position
Motion
Give 2 examples of light energy that we can see in the classroom.
Window, overhead lights, projector (when it's on), smart watch, Mrs. M's phone or computer screen
The ability to do work.
Energy
________________ surfaces have ______ friction than rough surfaces.
Smooth; less
Any push or pull
Force
People use ________ energy to heat or cook food.
Thermal
collision
Remember - it doesn't have to be violent!
Objects with _________weight (or mass) have a __________ gravitational pull.
more; stronger
Give 2 different examples of acceleration.
anything that speeds up, slows down or changes direction
How does sound energy travel?
Through vibrations that are carried by air, water, or other matter.
A law that says energy cannot be created or destroyed. It can only change form.
Conservation of energy
Give at least 2 words besides left and right that can describe the POSITION of an object.
above, below, north, south, east, west
What is the difference between speed and velocity?
Speed is how fast something is moving while velocity is the speed AND direction of an object.
Explain the difference between kinetic energy and potential energy. Give real life examples of each.
Kinetic - energy of motion
Potential - energy store in an object
Mrs. M will judge examples
Is it easier to stop a normal-sized car or an 18-wheeler semi truck? Use the word momentum to explain your answer.
The semi truck is harder to stop because it has more mass and therefore has more momentum than a car.
Remember: the more momentum an object has the more energy it has!
Explain the difference between balanced and unbalanced forces with real life examples.
Balanced - forces that act on an object WITHOUT changing its motion
Unbalanced - forces that change the motion of an object
Mrs. M will judge the examples.
Define inertia and give a real life example.
When an object in motion stays in motion or when an object at rest stays at rest.
Ex: a skier going downhill will keep moving until the reach the bottom of the hill + many others.
Why does electrical energy have to flow through wires?
The wires direct the electricity where we want it to go. Otherwise, electricity moves chaoticallly.
Bonus: It protects us from what would otherwise be a dangerous source of energy.
At the Delphi Opera House you turned the crank on the tiny music box and a tune came out. Explain what type of energy you put in and what type of energy came out.
Kinetic energy in (to turn the crank) - sound energy out (music)
Explain the difference between contact and non-contact forces with real life examples.
Contact - forces that occur when one object touches another
Non-contact - forces that occur without objects touching
Mrs. M will judge examples