Exam #1 Physical Science

True or false? The momentum of an object remains the same unless an unbalanced force acts on it.

True

What is a scheme of thought that has survived a test of detailed examination for long periods of time?

A scientific theory

True or false? Imagine an experiment in which an 8 lb bowling ball and a heavier 10lb bowling ball are dropped from a building's sixth floor window at the same time. The heavier ball will be observed to reach the ground first.

False

What does measurement NOT involve?

Creating units

True or false? Astronauts experience a weightless condition when they are in orbit.

False

What is NOT a SI unit of the property it measures?

Volume - liter

True or false? The force of gravity near the surface of Earth is 9.8 m/s2.

False (the acceleration is, not the force)

When something cannot be directly observed, what can it can be represented by?

A model

What is the re-creation of an event by comparing two situations in which all the factors are identical except one called?

A controlled experiment

The equation w = mg demonstrates that weight is an example of what type of quantity?

Force

If you consider the total distance and total time for a trip, what are you calculating?

The average speed

True or false? Measurement information used to describe something is called data.

True

A skateboarder pushes on the ground with her foot. What force causes she and the skateboard accelerate down the sidewalk?

The ground exerts against her foot

What is the group in an experimental situation that is used as the basis of comparison called?

The control group

What is the momentum of a 250 g ball travels at a velocity of 40m/s?

10 kg*m/s

A person not paying attention while skateboarding hits a rock. The skateboard abruptly stops, but the person does not and is an example of which law?

The Law of Inertia (1st law)

What should be done to claims that appear to be pseudoscience?

They should be tested experimentally

What happens to the mass and weight of a block of iron is transported to the Moon?

Its mass remains the same, but its weight decreases.

What is one of the basic differences between science and pseudoscience?

Valid and reliable experimental studies.

What is a tentative scientific explanation which may or may not be rejected upon further experimentation called?

A hypothesis

What does the property of volume measure?

How much space an object occupies

If an unbalanced force applied to an object doubles, then what happens to its acceleration?

Its acceleration doubles

What type of unit is the newton?

Force

What is a statement describing a relationship that is observed in nature to occur consistently time after time called?

A scientific law

True or false? A controlled experiment has all variables held constant.

False

True or false? The attractive force a 70 kg person exerts on Earth is much, much smaller than the force Earth exerts on the person.

False

True or false? A theory is a hypothesis that has been shown to be correct by many experiments.

False

What is the weight of a 50 kg box (roughly)?

500 N

What is The tendency of a moving object to remain in unchanging motion in the absence of an unbalanced force called?

Inertia

What can everything that happens in the universe can be traced to interactions of?

Four fundamental forces

What is an event with two situations with all the influencing factors identical except one called?

A controlled experiment

A heavy object and a light object are dropped from rest at the same time on a planet with no air (vacuum). When will the heavier object will reach the ground?

At the same time as the lighter object

In the equation A = пr2, what is п (pi)?

A numerical constant

What term is used to refer to how much matter a body contains?

Mass

True or false? The symbol "Δ" is used to refer to an object's density.

False (Δ = change in variable; delta)

What is the SI unit of measurement counterpart foe the English pound?

Newton

How many cm is 1 meter?

100