Identifying Forces

A skydiver uses a parachute to land safely because of

• air resistance

• balanced forces

• gravity

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NGSS.MS-PS2-4

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.

• The marble’s speed would increase.

• The marble would stop immediately. 

• The marble would remain at a constant speed.

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The force exerted by a surface perpendicular to an object resting on it (like a table supporting a book)

• Normal force

• Friction

• Applied force

• Gravity

The force opposing the motion of an object

• Friction

• Applied force

• Gravity

• Magnetic force

The force exerted by a person or object directly pushing or pulling on another object

• Applied force

• Gravity

• Magnetic force

• Electric/ electrostatic force

The force of attraction between any two objects with mass

• Gravity

• Magnetic force

• Electric/ electrostatic force

• Normal force

Tags

NGSS.MS-PS2-4

The force of attraction or repulsion between magnetic poles

• Magnetic force

• Electric/ electrostatic force

• Normal force

• Friction

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The force of attraction or repulsion between charged particles

• Electric/ electrostatic force

• Normal force

• Friction

• Applied force

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Occurs when two surfaces are touching and at rest relative to each other. This is the strongest type of friction

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

Occurs when a ball, wheel, or cylinder rolls over a surface. This is weaker than static or sliding friction

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction