Internal Forces
What is the force called when you pull on a rope or string?
Tension
What type of external force is applied when you push a book across a table?
Applied Force - push
What is the term for a force that is exerted in a specific direction on an object?
Action force
What is the term for an object’s ability to return to its original shape after being stretched?
Elasticity
What force is used when opening a door by pulling the handle?
Applied force - pulling
This force occurs when an object is squeezed or compacted. What is it?
Compression
Which force resists the motion of objects in contact with each other?
Friction
What is the term for the force that acts in the opposite direction of an action force?
Reaction force
What is the term for a permanent change in an object’s shape after a force is applied?
Plasticity
What force is acting on your bike tires when you apply the brakes?
Friction
What internal force occurs when two parts of an object are pushed in opposite directions, causing bending or breaking?
What external force is created when a stretched elastic band is released?
Elastic or spring force
According to Newton’s Third Law, if you push on a wall, what does the wall do?
The wall pushes back with an equal and opposite force.
Give an example of an object that shows plasticity when bent.
Example: Paper clip
What internal force is present when twisting the cap off a bottle?
Torsion
Which internal force is applied when you twist an object, like wringing out a cloth?
Torsion
Give an example of friction acting on an object.
Example: Rubbing your hands together creates friction.
In a game of tug-of-war, what is the reaction force when one team pulls on the rope?
The rope pulls back with an equal force in the opposite direction.
What property allows a rubber band to stretch and return to its original shape?
Elasticity
When sitting on a cushion, what internal force is acting within the cushion?
Compression
Describe an example where more than one internal force acts on an object at the same time.
Example: Bending a ruler involves both tension on one side and compression on the other.
How do external forces create internal forces in an object? Give an example.
Example: An external force like pushing on a sponge creates internal compression within the sponge.
Explain how action and reaction forces work when jumping off a diving board.
Your feet push down on the board (action), and the board pushes you up into the air (reaction).
Compare and contrast plasticity and elasticity with examples.
Example: Elasticity is when an object returns to its original shape after stretching, like a rubber band; plasticity is when an object stays deformed after force is applied, like a bent paper clip.
Describe the forces acting on a stretched slingshot before release.
Tension from the stretched band and elastic force ready to propel the object.