Forces and Motion - 7 Science

What is a FORCE?

• A push or pull on an object.

• The speed of an object in a given direction.

• The moment when two objects crash into one another.

• None of the above.

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NGSS.MS-PS2-2

NGSS.MS-PS2-1

____________ is the speed of an object in a given direction.

Which of the skiers experienced the largest force and how do you know?

• The red sweater skier experienced the largest force because it takes more force to slow down than to speed up.

• The yellow and purple sweater skiers because they both sped up by 6 m/s.

• All three skiers experienced the same force because they all had the same velocity change (6 m/s)

• The purple sweater skier because they went from not moving to going 6 m/s.

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NGSS.MS-PS2-2

NGSS.MS-PS2-1

What is FRICTION?

• A force that always speeds an object up.

• A rubbing force that slows an object down.

• Speed in a given direction.

• Stored up energy in a system.

Increased FORCE leads to...

• An increased change in velocity.

• A decreased change in velocity.

• The object always coming to a stop.

• An object always gaining mass.

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NGSS.MS-PS2-2

It requires more force to move a heavy object (more mass) compared to a lighter object (less mass).

• True

• False

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NGSS.MS-PS2-2

A book slid across the floor and came to a stop. What caused the book to stop?

• Velocity force from the floor.

• Friction force from the floor

• The force of the hand pushing it.

• The book stopped because it ran out of force and wanted to be at rest.

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NGSS.MS-PS2-2

What is a COLLISION?

• The amount of matter in an object.

• A force that always completely stops motion.

• The speed and direction of an object.

• The moment when two objects hit one another.

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NGSS.MS-PS2-1

What is Newton's FIRST Law of Motion?

• For every action there is an equal and opposite reaction.

• F=m x a

• An object in motion will stay in motion. An object at rest will stay at rest UNLESS acted upon by an outside force.

• Ouch an apple just hit me in the head.

What is a summary of Newton's SECOND law of motion?

• Things that are moving want to stay moving.

• As mass increases, you need more force to change the velocity of the object.

• Friction can be an outside force to change an object's motion.

• In a car crash, the objects run into each other and bounce back due to the equal and opposite reactions.