Gravitational and Frictional Force V

Which of the following statements is TRUE regarding the picture shown?

I. As the roller coaster goes down, less friction applies in order to speed up.

II. As the roller coaster goes down, gravity takes effect causing it to accelerate along the track able to go through the turns and loops.

III. As the roller coaster goes down, friction takes place causing it to accelerate faster.

IV. As the roller coaster goes down , it speeds up because it has greater mass.

• I

• II

• III

• IV

Which of the following statements is TRUE?

I. The greater the weight of the object, the greater force pushing surfaces together.

II. The larger the object is, the greater friction will occur.

III. Friction occurs whenever there is movement where matter comes in contact with other matter.

• I and II

• I and III

• II and III

• I, II, and III

Answer explanation

Friction occurs whenever there is movement where matter comes in contact with other matter or even if there is no movement present [static friction].

Which of the following is an advantage of friction?

I. Friction allows us to grip things.

II. Friction helps people convert one form of motion into another

III. Friction converts some energy into heat

IV. Friction makes objects difficult to move at constant speed.

• I and II

• III and IV

• I, II, and III

• I, II, III, and IV

The force of friction describes as ________.
I. A force generated by two surfaces that contact and slide against each other.

1. II. non-contact force

2. III. A force that occurs only when two surfaces are completely stationary

• I and II

• I and III

• II and III

• I, II, and III

The direction of the frictional force on a moving object is_______.

1. I. opposite to the motion of the moving object.

2. II. the same as the motion of the moving object.

3. III. not going to alter the acceleration of the moving object.

4. IV. never responsible for stopping the motion of the object.

• I

• II

• III

• IV

The strength of the force of gravity depends on ______.

1. I. the masses of the objects and their speeds.

2. II. the masses of the objects and the distance between them.

3. III. the weight of the objects and their speeds.

4. IV. the masses of the objects and their weights.

• I

• II

• III

• IV

Which is the best example of gravity?

1. I. A car hits a tree, and its motion stops.

2. II. A breeze blows, and a sailboat moves.

3. III. A book is pushed, and it moves across the table.

4. IV. A person drops a ball, and it falls to the ground.

• I

• II

• III

• IV

It is the transport of rock particles and soil from one place to another.

• Weathering

• Sedimentation

• Soil Erosion

• Soil Formation

Mass movement involves the downward movement of rocks and soil as one large mass

• True

• False

This agent of erosion pulls rock and soil down the slope causing landslide.

• Water

• Wind

• Gravity

• Friction