Prefixes
103
Kilo
Pick a scalar: displacement, acceleration, speed, force
Speed
Origin, coordinate system and clock
Reference frame
F1=5 N left; F2=27 N right. Net force is...
22 N right
What is the closest planet to the Sun?
Mercury
milli
10-3
Pair of perpendicular vectors that represent the influence of a vector in each direction associated with axes
Vector components
Velocity of an object which uniformly moved from x=18 m to x=6 m in 2 seconds
-6 m/s
What is greater: coefficient of static or coefficient of kinetic friction?
Static
How long does it take for light to travel from Sun to Earth?
About 8 min
106
Mega
What can you say about vectors B and -B?
Equal in magnitude and point in opposite direction
An object was thrown at 45 degrees above horizontal. What is the direction of its acceleration?
Newton's 3rd law
What happens when Earth is in between Sun and Moon?
Lunar eclipse
Tera
1012
What is magnitude of a+b if a= 6 units up and b= 8 units right?
10 units
Under what assumption dx=vxt for the projectile motion?
Air resistance is negligible
A block is sliding down the incline plane. List forces acting on the block
Gravity, normal, friction
Pluto-Charon system
Double Planet
femto
10-15
What needs to be done to find the vector sum of two non-perpendicular vectors?
Use cosine law and sine law
Two 300 m long trains approach each other at 20 m/s. For how long passengers of each train will see another train through the window (assuming line of the sight is perpendicular to the motion)?
7.5 s
You apply sideways force of 500 N on the table weighting 250 N, and the table does not move. Is it possible to find the coefficient of static friction? (justify)
No, since 500 N force may be not the maximum force.
It shows up once in 76 years in the Solar System
Halley's Comet