Intro to Physics

A runner covers 100 m in 20 s. What is the average speed?

• 7.2 km/h

• 14.4 km/h

• 18 km/h

• 36 km/h

Near Earth’s surface, the acceleration of gravity is about:

• 8.9 m/s²

• 9.8 m/s²

• 98 m/s²

• 0.98 m/s²

As you climb a mountain and the altitude increases, what happens to the boiling point of pure water?

• It stays at 100 °C

• It drops below 100 °C

• It rises above 100

• It always matches the altitude in °C

In the metric system, energy is measured in:

• Watts

• Joules

• Newtons

• Hertz

Which list correctly orders materials from least dense to most dense at room temperature?

• Air → Water → Iron

• Iron → Water → Air

• Air → Iron → Water

• Water → Air → Iron

In a vacuum, if the frequency of light increases, its wavelength:

• Increases

• Becomes zero

• Stays the same

• Decreases

The process of a liquid turning into a gas is called:

• Melting

• Evaporation

• Condensation

• Sublimation

A 2 kg ball moves east at 3 m/s. Its momentum vector points:

• West

• North

• East

• South

A person spins a 1 kg bucket of water in a 2 m radius horizontal circle so fast that the water stays at the bottom of the bucket without spilling. When the person increases the spinning speed, what force increases to keep the water in the bucket?

• gravity

• buoyant force

• friction

• centripetal force

What causes the pencil in a glass of water to look broken at the water’s surface?

• Absorption of light by water

• Reflection off the glass wall

• Refraction when light leaves water and enters air

• Dispersion splitting white light