Internal Forces Check-In

What is torsion?

• is a twisting or turning force

• is a pulling force that stretches a material

What is tension?

• is a pulling force that stretches a material

• is a pushing force that squeezes a material

What is compression?

• is a pushing force that squeezes a material

• is a force that makes a straight material curved

What is an internal force?

• is a force that acts from within the structure

• a force often makes materials shorter

Ling loves sleeping on her new mattress. Her old mattress was as hard as a board. The new mattress sinks comfortably under her when she climbs into bed. What type of internal force acts on the mattress when she lies on it?

• Compression

• Bending

• Torsion

• Tension

Rick tunes his guitar. Rick tightens a guitar string to make it play in tune. To tighten it, he turns the tuning peg at the end of the guitar string. What type of internal force acts on the tuning peg?

• Compression

• Tension

• Torsion

• Bending

Mr. Green is fishing and a big fish has taken the bait. The fish tries to swim away as Mr. Green tries to reel it in. What type of internal force acts on the fishing line?

• Compression

• Tension

• Torsion

• Bending

Stretching is another term for tension.  

• True
• False

Squeezing is another term for torsion.

• True
• False

Tension is an example of a pushing force.

• True
• False