Forces and Changes in Motion

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 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.

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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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Which answer best describes this image?

• The positive charge is repelling the negative charge.
• The blue charged object will repel the negatively red charged object.
• The positively charged red object will be attracted to the negatively charged blue object.

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If each object has the same mass, which pair has the strongest gravitational attraction?

• The first, because it appears to weigh the most.
• The first, because the arrows are thickest.
• The  second, because it has an even balance of weight and distance.
• The first, because the objects are closest together.

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Which of the following will not change in different gravitational fields?

• weight
• force
• mass
• pounds