What is a force?, A push, pull or twist., Name two drag forces., Air and water resistance., Is gravity a contact or non-contact force?, Non-contact, Name an interaction pair for a person sitting on a chair., The chair/person; chair/ground; person/ground, What is the unit of force?, Newton, Is friction a contact or non-contact force?, Contact, Does friction usually speed things up or slow them down?, Slow things down., Is a feather floating on water balanced or unbalanced?, Balanced, When a ball hits the floor the ball changes shape. What is another word for 'changing shape'?, Deforms, When the loops on a spring squash together what do we call this?, Compression, The amount that a spring stretches is called..., its extension, What is another name for 'support force'?, Reaction/normal force, An extended spring will bounce back to its original length. What force causes it to bounce back?, Tension, State Hooke's Law, When you double the force, you double the extension.., What does a linear line look like?, It is a straight line., What is the elastic limit of a spring?, The length at which a spring will not go back to its original length when you remove the force., Why do people lubricate the hinges on a door?, To reduce friction so that it opens and closes smoothly., What force allows a person to climb up a tall wall against gravity?, friction between the person's feet and the wall., What does streamlined mean?, The shape of the object minimizes resistance.

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