Vocabulary
Forces
Newton's Laws
Energy
Random
100
________________ is a force that opposes motion between two surfaces that are in contact.
Friction
100
A(n) __________________________ acting on an object changes its speed or direction of motion, or both
Unbalanced Force
100
When considering inertia, an object should continue to travel in a _________________________________________, unless an unbalanced force acts upon it.
straight line
100
A rubber band is being stretched, but it hasn’t been released to shoot across the room. This is an example of which type of energy?
Potential
100
All objects should fall to Earth at a speed of 9.81m/s every second. This does not happen because of the opposing force of friction, specifically called________________________.
air resistance
200
Draw arrows that demonstrate a balanced force.
-------><---------
200
Newton’s second law explains that the mass of an object multiplied by its acceleration will give you its momentum (force). Which object or animal would have the greatest momentum? A. A 50 gram bird flying 3 mph B. A 20 pound (9,072 grams) dog running 8 mph C. A 20 gram bullet at 0 mph
B. A 20 pound (9,072 grams) dog running 8 mph
200
A rubber band has been released and is sailing across the room. This is an example of which energy type?
Kinetic
200
An electrical cord is damaged (including the wire inside). Use what you know about electricity to explain why this is a problem (besides being dangerous and possibly electrocuting you).
The electricity (electrons) can't flow through the wire to complete the circuit
300
Bert told his daughter (covered in mud) not to move, and turned his back to grab a towel. He turned around to find she had not listened to his instructions. How could Bert tell motion occurred?
She is in a different location or postition. Definition of motion.
300
Thinking of physical science, explain how a preschool teacher watching twenty “active” four year-olds is not considered to be doing work, but a kid playing a video game by turning a fake steering wheel is considered to be doing work.
The video gamer is applying a force to the steering wheel over a distance, and the teacher is not.
300
What law of motion is demonstrated by a rocket ship taking off from the ground?
Third
300
As Alejandro rolls down a hill, which type of energy change allows him to speed up?
Potential energy turning into Kinetic engery
300
You have to raise a piano to a fourth story apartment window (over 40 feet). Which simple machine should you use to do this task?
Pulley
400
A __________________________ is often used to see which runner passed a distance in the shortest amount of time. An example would be a finish line.
Reference Point
400
What force is constantly acting on objects on earth?
Gravity
400
Write an example of Newton's second law
Heavier objects require more force to accelerate them. Less mass is easier to accelerate.
400
When does a pendulum have the highest potential energy?
At the top of the swing.
400
Speed can be calculated by dividing…
distance over time
500
What is the purpose of simple machines?
Make work easier by lessening the amount of energy needed to complete the task.
500
How can you tell if a balanced force or unbalanced force is being put on an object?
it won't move with a balanced force, will be moving if there is an unbalanced force.
500
What is the creepiest animal on earth?
SLOTHS!!!!!!!!!!!
500
Food is ______________________ energy, before your body converts it into mechanical energy.
Chemical
500
Draw the graph of an object that starts from rest, then accelerates constantly, then slows down and stops.
answers vary
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