Matter
The amount of matter in an object.
Mass.
The length of the path taken by the object.
Distance.
The force that brings the moving object to rest.
Friction.
Which force is described with the Hooke's law?
Elastic force / Elasticity.
Why do we say that a spring is elastic?
It can return to the original shape after small change in its shape (deformation).
The space an object takes up.
Volume.
The straight line that connects the initial and final positions.
Displacement.
An apple falls on the ground; the Moon revolves around the Earth; Solar System moves around the center of Milky Way. All of these is possible because this force acts on all objects with mass.
Gravity.
What is the SI unit of stiffness?
N/m.
State all states of matter.
Solid, liquid, gas, plasma.
Mass per unit volume.
Density.
Vector quantity that shows displacement in time.
Velocity.
What is the force of gravity that acts on 1 ton satellite flying at 100 km height? (g=10 N/m)
10000 N.
What is the SI unit of coefficient of friction?
It doesn't have a unit / Unitless.
When two substance mix with each other without external interference (action), its called ...
Diffusion.
What is the SI unit of density?
kg/m3.
Velocity that is shown on the speedometer.
Instantaneous velocity.
What is the weight of an astronaut with 80 kg mass, if he is out of the space shuttle flying toward the satellite to fix it, at 100 km height?
0 N - he's weightless. During the flight he does not touch anything, hence does not apply force on any surface.
Where will your mass be greater:
a) on the Earth (g=10)
b) on the Moon (g=1.62)
c) on the Jupiter (g=24,8)
It will be same everywhere.
How many planets are in the Solar System?
A material has a density of 1000 kg/m3. What would be the weight of a sample of the material with a volume of 10 cm3?
0.1 N
10 cm3=0.00001 m3
mxg=0.00001x1000x10=0.1 N
What is the name of the object (or system of the objects), to which we assign the axis to measure the numbers, that is used to describe the motion of the observed object?
Frame of reference.
Why do the ships float, even though they are made of metal?
They are mostly empty, filled with air, and overall density of the ship is less than water density.
Where will your weight be greatest?
a) on the Earth (g=10)
b) on the Moon (g=1.62)
c) on the Jupiter (g=24,8)
c) Jupiter.
How old is the Universe (according to the Big Bang theory)?
13.7 billion years.
13.5 or 14 is also an acceptable answer.