2B - Forces and Matter

Question 1

What is a force?

Answer 1

A force is a push or a pull

Question 2

In what two ways can a force relate to an object?

Answer 2

An object may exert a force, and a force may be exerted on the object. Both always occur at the same time.

Question 3

What are two types of forces?

Answer 3

The two types of forces are contact and field forces.

Question 4

What is a contact force?

Answer 4

Contact forces are exerted only between objects that touch (have contact).

Question 5

What is a field force?

Answer 5

Field forces can be exerted on objects that are separated by distance (think goal posts at the ends of a football field).

Question 6

Name the force responsible for: lightning

Answer 6

electrical

Question 7

Name the force responsible for: sand wearing away rock as water flows over the rock

Answer 7

friction

Question 8

Name the force responsible for: increasing pressure as you go deeper into the ocean

Answer 8

compression

Question 9

Name the force responsible for: a chunk of a glacier falling off into the ocean to form an iceberg

Answer 9

gravity

Question 10

Name the force responsible for: a rope holding up a cave explorer

Answer 10

tension

Question 11

Name the force responsible for: a landslide

Answer 11

shear or gravity

Question 12

What force acts against gravity to keep you from sinking into solid ground where you stand?

Answer 12

The force of the solid ground against your feet keeps you from sinking into the ground.

Question 13

(True or False) Your feet exert a compressive force on the ground where you stand?

Answer 13

True

Question 14

Which force is most significant for earth scientists?

Answer 14

Gravity is the most significant force for earth scientists

Question 15

What is true about the forces acting on a rock sitting on the ground?

Answer 15

In general, if the rock is sitting on the ground, then it is not accelerating, which means that all forces acting on it are balanced. There is no net force.