CH 2, 3, 4 and 5 mixed Flashcards
A plane traveling north at 300 km/h airspeed hits southerly wind of 300 km/h. What is landspeed?
- It will look like it is standing still in mid-air
what are the angle measures of a 1-1-root 2 triangle?
45 -45- 90 across from those sides respectively)
How is velocity different from speed?
50 m/s is a speed. 50 m/s NORTH is a velocity. Velocity is speed with direction.
If you are given a force and a mass, you can find ____ by using the equation ____
a = F/m
A plane traveling north at 300 km/h airspeed hits southerly wind of 50 km/h. What is landspeed?
250 km/h
When a bullet leaves a gun, explain why the bullet moves faster forward than the gun moves backward
bullet has small mass, lots of accelertion, gun has lots of mass, little acceleration
What is acceleration when 12N is applied to 3kg object? Why?
4 m/s2
If you have weight, how do you find directional force?
w*sin(angle) gives the directional force
Which is more stable, mass or weight? Explain
mass is same on earth or moon, weight changes
Discuss the vertical component of a thrown baseball
The vertical component is impacted by gravity, so always changing by 10m/s per second.
Suppose you know the hypotenuse and the measure of an angle, and want to find the side across from the angle, on the opposite side?
hypotenuse x SIN (angle) [sin finds opposite side]
What is Newton’s First Law?
Object stays at rest, or moves at a constant velocity in a straight line unless a force acts on it.
A plane traveling north at 300 km/h airspeed hits northerly wind of 50 km/h. What is landspeed?
350 km/h. The wind speed adds to groundspeed
What are the side lengths of the 45-45-90 triangle?
1, 1 and sqrt 2
When have you felt acceleration?
In a car when you speed up (pulled back), slow down (pulled forward) or turn (pulled away from turn direction).
About how fast do people run in m/s? (mph?) [km/h?]
4-6 m/s (9 - 15 mph) [ 15- 20 km/h]
a newton divided by acceleration (m/s2) will give you
mass (kg)
How much does a 3kg object weigh?
about 30N
If you drop a ball from rest, how far did it go after 1s ? 2s ? 5s?
distance is always “avg velocity times time” From rest we can say “distance = 5t2” So, 5m, 20m, 125m
SATELLITES: If an object falls at about 5 m in first second, and the earth curves about 5m every 8km. How fast would something have to travel horizontally to never hit the earth?
8km/s (neglecting air resistance)… now you orbit :)
SATELLITES: How many times does the international space station orbit the earth each day?
It circles the earth every 90 minutes, about 16 times a day!!
What are the side lengths of the 30-60-90 triangle?
1, sqrt 3 and 2
About how fast do people walk in m/s? (mph?) [km/h?]
1-2 m/s (2-5mph) [3-6km/h]
How can we add two vectors (find resultant) by sketching?
Use the parallelogram rule, and the DIAGONAL is the resultant vector when both components start from the same spot.