Physical Science Chapter 1 & 2

The mass of a 100 N sack of seed is closest to

10 kg

A 250 g ball travels at a velocity of 40 m/s. Its momentum is

10 kg m/s

The weight of a 50 kg box is closest to

500 N

A controlled experiment has all variables held constant. True False

False

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

False

Imagine an experiment in which a 8 lb bowling ball and a 10 lb bowling ball are dropped from the fifth floor at the same time. The heavier ball will reach the ground first. True False

False

Newton's second law states that if an unbalanced force acts on an object, it will move at constant velocity. True False

False

The force of gravity near the surface of Earth is 9.8 m/s2. True False

False

The mass of 1000 cm3 of water is a kilogram. True False

False

The property of mass is a measure of how heavy an object is. True False

False

The symbol "∆" is used to refer to an object's density. True False

False

When you roll a ball across the floor, it comes to a stop because you are no longer exerting a force on it. True False

False

An object accelerates when it slows or its direction of movement changes. True False

True

Measurement information used to describe something is called data. True False

True

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

True

Gravity is an attractive force between

all objects everywhere

Equations are used to

all of the above

A heavy object and a light object are dropped from rest at the same time in a vacuum. The heavier object will reach the ground

at the same time as the lighter object

If you consider the total distance and total time for a trip, you are calculating a(an)

average speed

An experimental situation used as the basis of comparison is the

control group

From the equation w = mg, it is apparent that weight is a(an)

force

The newton is a unit of

force

Everything that happens in the universe can be traced to interactions of

four fundamental forces

Suppose that a rock is swinging in a circle when some string is let out so that the length doubled as the same speed is maintained. The force now exerted on the string is

half as great

The property of volume is a measure of

how much space the object occupies

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

hypothesis

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

inertia

Ignoring air resistance, the velocity of a falling object

is constantly increasing

If an unbalanced force applied to an object doubles, then

its acceleration doubles

A block of iron is transported to the Moon. Which of the following is true?

mass remains the same, but the weight decreases

When something cannot be directly observed, it can be represented by a

model

A cannon ball and a bowling ball were dropped at the same time from the top of a building. At the instant before the balls hit the sidewalk, the cannon ball has greater

momentum

The pound is an English unit of measure; its SI counterpart is the

newton

In the equation A = πr2, π (pi) is a

numerical constant

The English unit of volume closest in size to a liter is

quart

A statement describing a relationship that is observed in nature to occur consistently time after time is a(an)

scientific law

If you double the mass of an object while an unbalanced force remains constant,

the acceleration of the object is halved

A boy on a skateboard pushes off the ground with his foot. He and the skateboard accelerate down the sidewalk due to the force

the ground exerts against his foot

hich of the following is not a SI unit of the property it measures?

volume - liter