Contact and Non contact forces.

What is a NON-CONTACT force?

• A push or pull force where the objects are not touching

• A push force where the objects are touching.

• An example would be pulling open a door.

• The only type of force that exists in the world.

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When two objects are closer to one another, the force of gravity between them ____________.

• Increases

• Decreases

• Stays the same

• Divides by a factor of 100

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What is the difference between MASS and WEIGHT?

• Mass DOES NOT change if the force of gravity changes. Weight DOES change if the force of gravity changes.

• Mass DOES change if the force of gravity changes. Weight DOES NOT change if the force of gravity changes.

• Mass is related to gravity while weight is not.

• If an object is SMALLER, it always has more mass and less weight than a LARGER object.

What are the poles of a magnet called?

• East and West Pole

• North and East Pole

• North and South Pole

• Up and Down Pole

If you placed two magnets next to one another, and the NORTH poles were facing one another, what would happen?

• The magnets would attract (pull together)

• The magnets would repel (push apart)

• The magnets would explode.

• The magnets would spin out of control.

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What are the three NON-CONTACT forces we are studying this unit?

• Gravity, friction, air resistance

• Forces, motion, human body systems

• Friction, electricity, muscular system

• Gravity, electricity, and magnetism

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What is an EFFECT of STATIC electricity?

• Your hand shocks the doorknob as you leave a room.

• Your iPad charges overnight when plugged in.

• A light bulb lights up when connected to a circuit.

• Our school is powered.

The three examples pictured are of

• Non-contact Forces

• Contact Forces

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The force between the phone and the mount is a

• contact force

• non-contact force

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Each non-contact force has an area of influence surrounding it.  What is this area called?

• gravitational attraction
• influence center
• field 
• attraction 

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