Understanding Forces and Measurements Flashcards
Explore key concepts of forces and measurements in physics with these engaging flashcards. (14 cards)
Why are forces modeled?
- forces cannot be seen acting
- there are many forces acting at a time
- their size and direction have important effects on situations, so need to be shown.
Do all scientific investigations need a hypothesis?
No, some experiments explore patterns without a prediction.
Do all scientific methods change variables?
No, some just observe what happens without changing anything.
What is a conclusion in science?
A statement that answers the enquiry question using evidence from the investigation.
Eg How does surface type affect friction?
Smoother surfaces cause less friction to act on objects sliding over them.
What is peer review?
Peers (people of a similar level of knowledge) test the results for quality.
What must a a peer review do?
- Repeatability:
- Same group, same results
- Reproducibility:
- Different group, same results
What must you have whena plnning to collect high-quality data?
- Measuring with skill
- Preparing the data table
- Repeatable data
What must you check before running a friction experiment?
Check force-meter is on zero with no force.
What does the table show?
How much force is needed to start sliding an object on different surfaces
What is the independent variable (IV) in the table?
The type of surface (e.g. glass, metal, paper).
What is the dependent variable (DV) in the table?
The force to start sliding (measured in newtons, N).
Why are there three numbers for each surface?
The test was repeated three times to make the results more reliable.
Which surface had the most friction?
Paper – it needed the most force to start sliding.
Which surface had the least friction?
Glass – it needed the least force to start sliding.
