Cause and Effect

Front

Sound is energy created by vibrations, traveling as waves through air. When a bell rings, the clapper strikes the metal, causing it to vibrate and produce sound waves that reach our ears.

Back

the clapper striking the bell

Front

Sound is energy created by vibrations. When a bell rings, the clapper strikes, causing the bell and surrounding air to vibrate, producing sound waves. What happens immediately after the bell vibrates?

Back

the air around the bell vibrates

Front

Sound is energy created by vibrating objects, causing air to vibrate and form sound waves. These waves travel through air and can be measured by devices like oscillators. When sound waves reach your ears...

Back

you hear the sound of the ring

Front

Sound is energy created by vibrating objects, causing air to vibrate and form sound waves. Waves close together indicate high pitch (like a bell), while far apart waves indicate low pitch (like a foghorn). If sound waves are far apart, the sound is...

Back

low-pitched

Front

100m sprint is the shortest outdoor race. Winners may be called the fastest in the world. Records are often broken by tiny margins. A crouched start, introduced 100 years ago, allows more energy for forward motion. Video and computer analysis help athletes optimize performance, reducing times. Why are new winners faster?

Back

the application of science

Front

Crouch position in 100m sprint improves time by putting more energy into forward motion.

Back

the runner puts more energy into forward motion

Front

100m sprint is the shortest outdoor race. The winner may be called the fastest person in the world. Records are often broken by tiny margins. A crouched start, introduced 100 years ago, allows more energy for forward motion. Video and computer analysis help athletes improve by showing every movement and suggesting minor adjustments to reduce time.

Back

It shows every movement the runner makes.

Front

The 100m sprint is the shortest outdoor track race. A crouch start, introduced by a runner in Scotland, allows more energy for forward motion. Video and computer analysis help athletes improve performance by suggesting small adjustments. What can a runner achieve by changing arm position?

Back

she can reduce wind resistance

Front

Why was Mary leaving home?

Back

was not married

Front

Mary Sivulich, born in 1883 in the Austro-Hungarian Empire, worked as a maid in America. After marrying John and having six children, she desired independence from her employer.

Back

She wanted a life independent of her employer.