Final Review

Question 1

An object following a straight-line path at constant speed

Accepted Answer

has zero acceleration

Question 2

A straight line about which rotation takes place is called an axis

Accepted Answer

True

Question 3

A force is exerted on the tire of a car to accelerate the car along the road. The force is exerted by the

Accepted Answer

road

Question 4

Any force that causes an object to move in a circular path is called a centripetal force.

Accepted Answer

True

Question 5

A freely falling object starts from rest. After falling for 1 seocnd, it will have a speed of about

Accepted Answer

10 m/s

Question 6

As an object falls freely in a vacuum, its

Accepted Answer

velocity increases

Question 7

A ball is thrown straight up. At the top of its path its instantaneous speed is

Accepted Answer

0 m/s

Question 8

A girl pulls horizontally on a 10-kg wagon with a constant force of 20 N. What is the wagon's acceleration?

Accepted Answer

2 m/s/s

Question 9

Which has more mass, a kilogram of feathers or a kilogram of iron?

Accepted Answer

Neither -- they both have the same mass

Question 10

The rotational speed of a wheel is defined as the number of rotations it makes in a unit of time.

Accepted Answer

True

Question 11

The force required to maintain an object at a constant speed in free space is equal to

Accepted Answer

zero

Question 12

A car starts from rest and after 7 seconds is moving at 42 m/s. What is the car's average acceleration?

Accepted Answer

6 m/s/s

Question 13

If the force of gravity suddenly stopped acting on the planets, they would

Accepted Answer

move in straight lines tangent to their orbits

Question 14

A rock is thrown vertically into the air. At the very top of its trajetory the net force on it is

Accepted Answer

its weight

Question 15

Two people pull on a rope in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?

Accepted Answer

400 N

Question 16

When an object turns about an external axis, the motion is called rotation.

Accepted Answer

False

Question 17

A bug on a record player will make more turns per minute if it is located toward the center of the record.

Accepted Answer

False

Question 18

According to Newton's third law, if you push gently on something, it will push

Accepted Answer

gently on you

Question 19

Friction

Accepted Answer

all of the above

Question 20

Compared to its weight on Earth, a 10-kg object on the moon will weigh

Accepted Answer

less

Questions 20