Chapter 3,4,7 Science Test

1.

1 point

Use Newton's second law to answer this question: The acceleration of a vertically-tossed ball at the top of its path is

zero

between zero and 10 m/s squared

10 m/s squared

dependent on initial speed of the ball

2.

1 point

When a 15-N falling object encounters 10 N of air resistance, its acceleration is

not enough info

more than g

less than g

g

3.

1 point

As a ball rolls down an inclined plane with no air drag, its speed increases and its acceleration

remains unchanged

decreases

none of the above

increases

4.

1 point

An object in free fall undergoes an increase in

acceleration only

both speed and acceleration

none of the above

speed only

5.

1 point

A boulder falls due to gravity. The reaction to the force on the boulder is

actually, all of these

the boulder being pulled downward by Earth

the boulder pulling up on Earth

air resistance

6.

1 point

Consider the Earth pulling on the Moon. Which of these is true?

Both Earth and Moon pull each other with the same amount of force

Earth and Moon have equal accelerations

none of the above

the more massive Earth exerts a greater force on the Moon

7.

1 point

The magnitude of G indicates that gravity is

a relatively weak force

responsible fort eh orbiting of planets

a relatively strong force

responsible for all falling objects

8.

1 point

When you push with a horizontal 15-N force on a book that slides at constant velocity, the force of friction on the book is

zero

slightly less than 15 N

15 N

slightly more than 15 N

9.

1 point

The force that propels a rocket is provided by

gravity

its exhaust gases

Newton's laws of motion

the atmosphere against which the rocket pushes

10.

1 point

The speed of a vertically-tossed ball at the top of its path

between zero and 10 m/s squared

zero

10 m/s squared

dependent on the mass of the ball

11.

1 point

Gravity pulls downward on a book placed on a table. The book remains at rest because

the sum of the forces on it are zero

action and reaction are acting on different objects

the speed of the book doesn't change

no acceleration occurs

12.

1 point

An object will accelerate when

applied force equals frictional force

its mass increases

it is pushed or pulled with a net force

13.

1 point

If the mass of the Sun and a planet that orbits the Sun are both doubled, with the distance being the same, the force of gravity between them

increases by eight

remains unchanged

quadruples

doubles

14.

1 point

The acceleration of a rain drop that falls at constant velocity

decreases over time

increases over time

is directed downward

is zero

15.

1 point

An object with a mass of 1 kilogram on Earth

Has less mass on the Moon

Has the same mass on the Moon

Has more mass on the Moon

Weighs the same everywhere

16.

1 point

A grasshopper has a collision with the windshield of a massive high-speed truck. The force of impact on the grasshopper is

less than the impact force on the truck

the same as the impact force on the truck

more than the impact force on the truck

actually zero

17.

1 point

As the distance between two planets increases, the gravitation force between them

decreases in inverse proportion to distance

increases in direct proportion to distance

decreases as the square of the distance

increases as the square of distance

18.

1 point

Drop a 10 kg rock and a 5 kg rock front he same height at the same time and in the absence of air drag they fall with

different acceleration

the same acceleration

zero net forces

quite different speeds

19.

1 point

Consider your book at rest on a table. When you push it horizontally and it's on the verge of sliding, but still at rest, friction on the book acts in a direction that is

in no direction until the book slides

opposite to your push

the same direction as your push

at right angles to your push

20.

1 point

The force of gravity acting on a 2-kg melon is

20 N

more than 20 N

2 kg

10 N

21.

1 point

A cart is pushed and undergoes a certain acceleration. If the force is held constant and the mass of the cart doubles, its acceleration would be

the same

one quarter

nearly but not quite twice

one half

22.

1 point

A baseball is hit with 1500 N of force. The ball exerts a reaction force against the bat of

somewhat less than 1500 N

1500 N

somewhat more than 1500 N

zero

23.

1 point

A space craft on its way fro Earth to the Moon is pulled equally by Earth and Moon when it is

closer to the Moon's surface

a closer to the Earth's surface

at no point, since Earth always pulls more strongly

half way from Earth to Moon

24.

1 point

If a ball rolls down an inclined plane and picks up a speed of 4 m/s each second it rolls, its acceleration is

one half of 4 m/s

one half of 4 m/s squared

4 m/s squared

10 m/s squared

25.

1 point

When a cat walks across the lawn, its feet push backward on the lawn and

none of the above

also push the lawn forward

the lawn pushes forward on its feet

the lawn also pushes backward on its feet