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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