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

AMuscle power is not effective in space.

BIt makes any experiment expensive.

CIt is an almost frictionless environment.

DMotion is very slow in space.

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

Atechnology

Blaboratory work

Ctheoretical physics

Dspace exploration

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

Amove the astronaut in the direction opposite that in which the gas is released

Bcontaminate space

Cmove the astronaut in the direction that the gas is released

Dmake the journey too expensive for the government

Which of the following is true of pure science?

AIt is more difficult than applied science.

BIt is distinctly different from applied science.

CIt seeks to discover natural principles.

DIt 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?

AGravity on the stones would increase.

BThe launch angle would be affected.

CThe enemy would be able to destroy the wheels.

DThe 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?

Amaking the material heavier

Blubricating the surface with oil or graphite

Cinserting a layer of soft fabric on the surface

Drasping 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?

AThe rapid expansion of gases out of the exhaust.

BThe rotation of the axle causes a frictionless situation.

CThe road pushing back on the car.

DA net force exerted by gravity on the axles of the car.