Phys 101 Lecture

What makes a rolling ball stop moving?

• Gravity
• Friction
• A balanced force
• An applied force

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NGSS.MS-PS2-2

NGSS.MS-PS3-5

Name the missing force....

• Weight force
• Normal force
• Frictional force
• Tension force

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NGSS.MS-PS2-4

Name the missing force...

• tension force
• gravitational force
• normal force
• applied force

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:

• normal

• abnormal

• static

• inertia

Match description with free-body diagram.

• A book is at rest on a tabletop.
• A gymnast holding onto a bar, is suspended motionless in mid-air. The bar is supported by two ropes that attach to the ceiling. Diagram the forces acting on the combination of gymnast and bar.
• An egg is free-falling from a nest in a tree. Neglect air resistance.
• A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Name the missing force...

• thrust
• frictional force
• normal force
• weight force

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NGSS.MS-PS2-2

Which FBD is most appropriate for describing the following situation?

A book sits on top of the table, motionless.

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NGSS.MS-PS2-4

TRUE or FALSE

Normal force is always perpendicular to the surface at which an object is resting.

• True

• False

TRUE or FALSE

Friction force always goes in the same direction as the motion of an object.

• True

• False

The force that pulls objects toward the Earth

• Speed

• Gravity

• Normal

• Thrust

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4