Chapter 13

Forces in Motion

Lessons

Vocabulary

NC Standards - 5.P.1

Understand force, motion and the relationship between them.

EOG Concepts

Lesson 1, How can you describe motion?

NC Standard

5.P.1.2 -- Students know that it is possible to measure the motion of an object based on the distance it will travel in a certain amount of time.

5.P.1.3 -- Students know that a graph can be created using one axis to represent the distance that an object travels, and the other axis to represent the period of time the object is traveling. Students know how to construct a graph that demonstrates a relation of distance to time.

Lesson 2, What are forces?

NC Standard

5.P.1.1 -- Students know that gravity pulls any object on or near the earth toward it without touching it. 

Lesson 3,  What are Newton's laws of motion?

NC Standard

5.P.1.4 -- Students know that the greater a force is, the greater the change (in motion) it produces. The greater the mass of the object being acted on, the less the effect of the (same) force.

Lesson 4, What are simple machines?

Study Guide for Test

Vocabulary

Concepts

EOG Questions - 5.P.1.1    Forces in Motion

 1.  A pencil falls off of a desk. What moves the pencil toward the floor? 

a.   mass                                    b.  friction

c.   gravity                                 d.   speed

 

2. A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop? 

a.   gravity acting on the wagon

b.  friction acting on the wagon

c.   the mass of the wagon

d.   the mass of the child

 

3. A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon? 

a.   It would cause the wagon to move faster.

b.  It would cause the wagon to change mass.

c.   It would cause the wagon to change direction.

d.   It would cause the wagon to slow down.

 

4. Which best explains why a bicycle slows down when its brakes are applied? 

a.   The brakes heat the rubber on the bicycle tires.

b.  The brakes add energy to the bicycle.

c.   The brakes increase the force of gravity on the bicycle.

d.   The brakes cause frictional forces on the wheels of the bicycle.

 

5. A ball is kicked and rolls along a level field until it comes to a stop. What is most responsible for the ball coming to a stop? 

a.   air

b.  gravity

c.   mass

d.   friction

 

6. What causes a wagon to speed up when going down a hill? 

a.   gravity

b.  friction

c.   air pressure

d.   mass

 

7. A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of her walk than in the second 15 minutes. What can she conclude about her walk? 

a.   She walked over many hills.

b.  Her average speed was faster during the first half of her walk.

c.   She walked in two different directions.

d.   She was walking at a constant speed.

 

8. What can cause a moving object to increase its speed in a forward direction? 

a. a force pushing on the object from the opposite direction

b. a force that continually acts on the object in the direction the object is moving

c. an increase in the mass of the object

d. a decrease in the mass of the object

  

9. A runner measured the time it took him to run 5 km. What can he calculate from the distance and time measurements? 

a.  direction

b.  mass

c.  speed

d.  force

 

10. If a car is moving backward along a road, can its speed be measured? 

a. Yes, it can, because the car does not have friction acting on it.

b.    Yes, it can, because the car travels a distance in a certain amount of time.

c. No, it cannot, because speed can only be measured if the car is moving forward.

d. No, it cannot, because the distance traveled backward by a car cannot be measured.

  

11. Scientists discover an asteroid that is moving through space. What information is needed to determine the average speed of the asteroid? 

a.  the mass and size of the asteroid

b.  the distance the asteroid is from Earth

c.  the direction the asteroid is moving and its distance from Earth

d.  how far the asteroid has moved in 24 hours

 

12. A bowling ball moves across a flat surface at 7 feet per second. If a student is asked to calculate the total distance traveled by the ball, what other information does the student need to know? 

a.  amount of friction between the ball and the surface

b.  amount of force applied to the ball

c.  total time the ball rolled

d.  mass of the ball


13. Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion? 

a.  ball with a mass of 5 kg

b.  ball with a mass of 10 kg

c.  ball with a mass of 15 kg

d.  ball with a mass of 20 kg

 

14. Which best describes the speed of a ball as it is thrown straight up into the air and comes back down? 

a. The ball goes up at a constant speed, stops, then comes down at a constant speed.

b. The ball goes up at a constant speed, stops, and increases speed as it comes down.

c. The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.

d. The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.