Unit 2: Measurements
what are the types of zeros
1) Leading
2) Trailing w/ decimal
3) Trailing w/o decimal
4) Trapped
What is the difference between Distance and Displacement?
Distance is the total amount traveled.
Displacement is the difference from the starting point to the ending point.
What is Dynamics?
Study of motion and forces that cause the motion.
objects speed along line tangent to the circular path
What are the three types of motion?
Translation
Rotational
Vibrational
*all independent of each other*
Which types of zeros are significant?
Trapped zeros are always significant and Trailing zeros are only significant when there is a decimal.
What is the free fall rate? (g=?)
g = 9.8m/s^2
What is force?
The push or pull between two objects
mass * acceleration
How do you find centripetal acceleration?
tangential speed^2/radius
What is torque? What is the equation?
qty measuring the ability of a force to rotate an object. Torque = Force x distance x angle.
Round 13.0706 to three sig figs
13.1
What does the slope stand for on a velocity v. time graph? The area?
The slope on a V vs. T graph stands for acceleration. The area equals displacement.
What is the relationship between mass and inertia?
mass = inertia
greater mass, greater inertia
mass x (tangential speed^2/radius)
What is the equation for momentum?
momentum = mass x velocity
How many sig figs are in 0.00460680
There are 6 sig figs.
How do you know when something changes direction?
When velocity changes signs.
what represents force in a free body diagram?
the arrow or vector represents force.
What is the equation for Newton's Law of Universal Gravitation?
Gravitational Force =
Constant x ((mass 1)(mass 2)/distance between masses^2)
What is the equation for how quickly momentum changes? (momentum-impulse theorem)
(m(Δv))/(Δt)
What is a derived unit?
A derived unit is combined base units.
What is the relationship between distance, speed, and time?
speed = Distance/Time
Time = Distance/Speed
Distance = Speed * Time
what does the law of inertia tell us?
An object in motion stays in motion and an object at rest remains at rest unless acted on by an unbalanced force
What do Kepler's Laws describe?
Kepler's Laws describe the motion of the planets
A 2250 kg truck has a velocity of 35m/s. What is the momentum?
78750