Download Six-week DCA * Review

Name____________________________
Period _____________________
8th Grade Six-week DCA – Review
1. What could cause an object to speed up, slow down, or change direction?
2. What is velocity?
3. A book is sitting on the seat of a moving car. What would happen to the book if the car suddenly stops?
4. Would a tennis ball or a bowling ball require more force to move? Why?
5. What is Newton’s first law of motion?
6. Give an example of Newton’s first law of motion.
7. Calculate the speed of a car that went a distance of 125 miles in 2 hours. (S=D/T)
8. What is friction? Give one example.
9. 25 N 20 N
What will be the net force acting
11.
12.
on the box?
Speed = Distance/Time
What would be the speed of the swimmer at 5 m?
Between what times did the
swimmer stop moving?
13. Will a Ford Mustang or an 18 wheeler truck accelerate faster? Why?
14. What is the difference between a balanced force and an unbalanced force?
15. Identify the name of this lab equipment. What does it measure?
Name____________________________
Period _____________________
16. What is Newton’s third law of motion? Give an example.
17. If the same force is applied to a marble and a football, which would have the greater acceleration? Why?
18. What would be the mass of this object?
19. The three vehicles shown below are all traveling at a speed of 15m/s, but only the pickup truck has a changing
velocity.
The pickup truck has a changing velocity because the pickup truck —
A can accelerate faster than the other two vehicles
B is traveling in the opposite direction from the other two vehicles
C is traveling on a curve in the road
D needs a large amount of force to move
20. A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass.
Which element should the researcher select for the experiment?
A. Nitrogen (N)
B. Sulfur (S)
C. Arsenic (As)
D. Silicon (Si)
21. For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records
data in the table below.
Which of these best explains the student’s data?
A. The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and
the ramp
B. The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is
greater than the force of gravity
C. The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are
unbalanced
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Period _____________________
D. The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are
balanced
22. A model of an atom is shown below.
An atom of which element is represented by this model?
A. Boron (B)
B. Carbon (C)
C. Neon (Ne)
D. Sodium (Na)
23. Which of the following best describes an electron?
A. It has no charge and about the same mass as a proton
B. It has a negative charge and much less mass than a proton
C. It has a positive charge and much more mass than a neutron
D. It has a negative charge and about the same mass as a neutron
24. Four students raced toy cars on a track. The mass and acceleration of each car is recorded in the table below.
Which toy car had the greatest applied force?
A. 1
B. 2
C. 3
D. 4
25. A car travels at a constant speed of 15 m/s for 2 minutes. The car increases its speed from 15 to 25 m/s during
the next minute and then travels at a constant speed of 25 m/s for 2 more minutes. Which of the following graphs
best represents the car’s motion during this 5-minute period?
Name____________________________
Period _____________________
26. A student walks 2 km in 30 minutes. What is the student’s average speed in km/h?
27. Calculate the number of protons, neutrons, and electrons and draw a Bohr model for each of the
following elements:
A. Beryllium (Be)
Protons=
Neutrons=
Electrons=
B. Argon (Ar)
Protons=
Neutrons=
Electrons=
C. Phosphorus (P)
Protons=
Neutrons=
Electrons=
E. Sodium (Na)
Protons=
Neutrons=
Electrons=
F. Chlorine (Cl)
Protons=
Neutrons=
Electrons=