Highlights
Stroking Molecules
Nancy Burnham
Science & Nature
Science Inventions Technology, molecules, scientists
HL
993
B2
English
9781682381649
Friction is the force between two things that opposes their motion. Scientists want to learn all they can about friction, and are doing so using a special instrument called a scanning-force microscope.
Word lists coverage
The word and grammar lists are compiled from commercially available resources and English study websites. They are not intended to be authority. Use at your own discretion.| List | Total | Coverage |
|---|---|---|
| Eiken Grade 1 | 3,105 | 0.1% |
| Eiken Grade 2 | 866 | 0.69% |
| Eiken Grade 3 | 900 | 7.78% |
| Eiken Grade 4 | 600 | 13.33% |
| Eiken Grade 5 | 600 | 17% |
| Eiken Grade Pre1 | 2,868 | 0.17% |
| Eiken Grade Pre2 | 1,327 | 2.34% |
| Eiken Grade Pre2+ | 1,562 | 2.69% |
| NDL | 875 | 20.23% |
| NGSL 1 to 1,000 | 1,000 | 17.5% |
| NGSL 1,001 to 2,000 | 1,000 | 4.3% |
| NGSL 2,001 to 3,000 | 801 | 1.37% |
| NGSL Supplemental | 52 | 5.77% |
Grammar lists coverage
The word and grammar lists are compiled from commercially available resources and English study websites. They are not intended to be authority. Use at your own discretion.| List | Total | Unique | Coverage | Unique |
|---|---|---|---|---|
| Eiken Grade Pre1 | 94 | 94 | 0% | 0% |
| Eiken Grade 2 | 123 | 122 | 0% | 0% |
| Eiken Grade Pre2 | 111 | 108 | 0% | 0% |
| Eiken Grade 3 | 48 | 47 | 0% | 0% |
| Eiken Grade 4 | 52 | 49 | 0% | 0% |
| Eiken Grade 5 | 176 | 139 | 0% | 0% |
| A1 | 352 | 316 | 0% | 0% |
| A2 | 949 | 893 | 0% | 0% |
| B1 | 1,126 | 1,106 | 0% | 0% |
| B2 | 775 | 760 | 0% | 0% |
| C1 | 402 | 395 | 0% | 0% |
| C2 | 312 | 308 | 0% | 0% |