Internal Forces
What internal force causes an object to be pulled when stretched from both ends?
Tension
What external force slows down a sled on snow?
Friction
Give an example of an action force.
Answers will vary. Should have something to do with exerting force on an object, example: kicking, pushing pulling.
If you stretch a rubber band and it goes back, what is this property called?
Elasticity
Name one energy resource that is used before processing.
Wood, wind, water
Which internal force pushes or squashes an object?
Compression
What is the force when you push a box across the floor?
Applied force
What is the reaction force when a balloon is released?
Air rushes out, pushing the balloon the other way.
Bending a paperclip so it stays bent shows what property?
Plasticity
Name two energy resources used after processing.
Any two of: Wind, Solar, Fossil Fuels, Nuclear, Hydro, Biofuel
A metal rod twists when turned. What type of internal force is this?
Torsion
What force pulls objects toward the Earth?
Gravity
True or False: Every action force has only one direction and no reaction.
What’s the difference between elasticity and plasticity?
Elasticity = temporary shape change
Plasticity = permanent shape change
Is wind an energy source used before or after processing?
Before and after — can be both depending on context
A chocolate bar snaps when pushed from both ends in opposite directions. What force is this?
Shear
You jump, and the trampoline pushes you back up. What force is that?
Elastic or spring force
You jump, and your feet push on the ground. What is the reaction?
The ground pushes back up on your feet
Give an example of something that shows plasticity in real life.
Answers vary: bent spoon, clay sculpture, etc.
List three processed energy resources and one unprocessed one.
Processed: Solar, Nuclear, Fossil Fuels
Unprocessed: Wind or Water
What is an internal force? (Explain)
A force that acts from within a structure.
You kick a soccer ball, but it slows down over time. Name two external forces acting on the ball.
Friction and gravity
What does Newton's law state. Give an example.
For every action force, there is an equal and opposite reaction force.
True or False: Elastic changes are permanent.
False — they are temporary
What’s the difference between energy used before and after processing?
Before = natural state
After = has been changed or refined for use.