Why is space a good place to demonstrate newton's laws of motion?

a) muscle power is not effective in space.
b) it makes any experiment expensive.
c) it is an almost frictionless environment.
d) motion is very slow in space.

which of the following means roughly the same thing as applied science?

a) technology
b) laboratory work
c) theoretical physics
d) space exploration

in space, an astronaut's jet pack that releases compressed nitrogen in one direction will

a) move the astronaut in the direction opposite that in which the gas is released
b) contaminate space
c) move the astronaut in the direction that the gas is released
d) make the journey too expensive for the government

which of the following is true of pure science?

a) it is more difficult than applied science.
b) it is distinctly different from applied science.
c) it seeks to discover natural principles.
d) it is of less value than applied science.

in medieval warfare, catapults were used to lob stones and firepots at the enemy. what would be the danger in putting such a catapult on wheels?

a) gravity on the stones would increase.
b) the launch angle would be affected.
c) the enemy would be able to destroy the wheels.
d) the catapult would move backward rapidly when fired.

a coefficient of friction is a measure of how much friction there is to oppose motion in a given material. a higher coefficient of friction means that the sliding friction of the surface is increased. which of the following actions will lower the coefficient of friction?

a) making the material heavier
b) lubricating the surface with oil or graphite
c) inserting a layer of soft fabric on the surface
d) rasping the material to make it rougher

when a car’s wheels turn, the wheels push backward on the road. what is it that makes the car go forward?

a) the rapid expansion of gases out of the exhaust.
b) the rotation of the axle causes a frictionless situation.
c) the road pushing back on the car.
d) a net force exerted by gravity on the axles of the car.