# HS-PS2-1

## Analyze data to support the claim that Newton's second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration.

Tech

### Did builders of Egypt’s first pyramid use a water-powered elevator?

A controversial study suggests that ancient people might have used one to hoist the stones used to assemble into King Djoser’s pyramid.

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Physics

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## More Stories in HS-PS2-1

1. Physics

### When dominoes fall, how fast the row topples depends on friction

Two types of friction help determine how quickly a line of dominoes collapses, computer modeling shows.

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2. Physics

### Scientists Say: Inertia

Inertia is the tendency of objects to resist changes in their motion.

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3. Physics

### Explainer: The fundamental forces

Four fundamental forces control all interactions between matter, from the smallest subatomic particles to the largest structures in the universe.

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4. Tech

### A new device uses atoms’ quantum weirdness to peer underground

Quantum sensors like this one could monitor magma beneath volcanoes or uncover archaeological artifacts.

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5. Physics

### Explainer: How do mass and weight differ?

Learn why these terms aren’t the same and which to use where. And should you report your results in kilograms? Pounds? If in doubt, try using newtons.

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6. Physics

### Analyze This: Masks cut the distance that spit droplets fly

Both cloth masks and surgical masks reduced the distance spit traveled from a person talking or coughing by at least half, compared with no mask.

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7. Physics

### Explainer: Gravity and microgravity

The force of gravity holds us on the ground, keeps planets in orbit and extends throughout space. A very weak gravitational pull is called microgravity.

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8. Physics

### Scientists Say: Mass

Mass shows how much an object resists speeding up or slowing down when force is applied — a measure of how much matter is in it.

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9. Physics

### Staying grounded in space requires artificial gravity

On TV, people in space walk around like they’re on Earth. How can science give real astronauts artificial gravity? Spin right round, baby.

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