Prologue and Chapter 1 Homework

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What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s?

0 m/s^2

The net force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

10 N

You're driving in a car at 50 km/h and bump into the car ahead traveling at 48 km/h in the same direction. The speed of impact is

2 km/h

A 50 N object falling in air experiences 30 N of air resistance. The amount of net force on the falling object is

20 N

An object in free fall has a speed of 60 m/s. One second later its speed is

70m/s

the scientists to first introduce the concept of inertia was

Galileo

In Science a theory is

a synthesis of a large body of well-tested knowledge

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

add to your equal weight

A tutor will be correct in saying that velocity and acceleration are

different concepts

A parachutist falling at constant velocity is in a state of

dynamic equilibrium (rest)

The scientific method is most effective in

gaining, organizing, and applying new knowledge

Science is a body of knowledge that extends back to

humankind's beginnings

During each second of free fall, the speed of an object

increases by the same amount

Whenever the net force on an object is zero, its acceleration

is zero

Aristotle believed that natural laws could be understood by

logic

On the surface of the moon where acceleration due to gravity is less, a person's hang time would be

longer

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

mass, inertia, and volume

In science facts

may change

According to Galileo, inertia is a

property of all matter

An object is pulled with two forces, 10 N northward and 15 N southward. The direction of the net force is to the

south

An object in mechanical equilibrium is an object

that is moving at constant velocity, that has no acceleration, and that is at rest

A truly educated person is knowledgeable about

the arts, religion, and science

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. The object with the greater mass is the one on

the moon

What did Galileo incorporate in his study of motion that Aristotle overlooked?

the role of time

Compared with the mass of a certain object on Earth, the mass of the same object on the moon is

the same

When you push a crate across a level floor at constant speed, friction between the crate and the floor is

the same amount as your pushing force

As an object freely falls, its

velocity increases

If you toss a ball straight upward at 40 m/s with no air resistance, 6 seconds later its speed is

zero

The speed of a vertically thrown ball at the top of its path is

zero


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