Physics- Test 1 Flashcards
What does a linear relationship look like on a graph?
A straight line
What does a non-linear relationship look like on a graph?
A curved line
How do you tell if a relationship is directly proportional?
A straight line through the origin
What is the spring constant?
The force needed to stretch or compress a material by 1m
What is spring constant measured in?
N/m
What is the equation for spring constant, force and extension?
Force= spring constant x extension
F=ke
What is Hooke’s law?
The force applied to a spring is directly proportional to the extension
On a force-extension graph, where is the limit of proportionality?
Where the line starts to curve
What is meant by elastic deformation?
An object will return to its original shape after being stretched or compressed if the force is below the limit of proportionality
What is plastic/inelastic deformation?
An object will not return to its original shape after being stretched or compressed. The force is beyond the limit of proportionality and is permanently deformed
How do you carry out a force-extension experiment accurately?
- Set up a clamp stand with a spring and a ruler aligned vertically
- Add masses to the spring and record extension
- Use the equation F=ke to find what you need
What is the equation involving density, mass and volume?
Density=mass/volume
p=m/v
How do you find the density if a regular shaped object?
- Find the volume by multiplying height, width and length
- Measure the object’s mass on a set of scales
- Use the equation p=m/v to find density
How do you find the volume of an irregular object?
- Fill a eureka can with water up to the spout
- Place your object into the water and collect the displaced water in a measuring cylinder. Read the volume
- Find the mass using scales
- Use the equation p=m/v to find density
What is uncertainty?
The range of values in which we expect the true value to lie
