Worksheets8th Grade CBA #2 Review Part 1
Total questions: 34
Worksheet time: 25mins
Name
Class
Date
1.
Two teams play a game of tug of war. Using the picture what will the result be?
a)
the rope will be pulled to the east with 25N of net force
b)
the rope will not move
c)
the rope will be pulled to the west with 25N of net force
d)
the rope will be pulled to the east with 275N of net force
2.
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. 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
d)
the speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced
3.
When a space shuttle was launched, the astronauts onboard experienced an acceleration of 29.0 m/s2. If one of the astronauts had a mass of 60.0 kg, what net force in Newtons did the astronaut experience?
a)
1740N
b)
89N
c)
740N
d)
2.07N
4.
A student walks for 2.0 hours and travels 5.0 km. What is the average speed of the student?
a)
2.5 km/hr
b)
2.0 km/hr
c)
10 km/hr
d)
0.4 km/hr
5.
A boat moving north in a river is going 3m/s while the current in the river moves south at 1m/s. How will the boat be affected if it enters a part of the river where the current is moving south at 2m/s?
a)
the boat will move slower
b)
the boat will move faster
c)
the boat will stop
d)
the boat will move to the west
6.
The marble started rolling at point A. It stopped at point B. Measure how far the marble rolled.
a)
8 cm
b)
9 cm
c)
9 in
d)
the marble didn't move
7.
The homemade cart is being pushed with a force of 25 N. The force causes the cart to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?
a)
the cart will move at a constant speed of 13 m/s
b)
the speed of the cart will not change
c)
the speed of the cart will increase
d)
the speed of the cart will decrease to 1 m/s
8.
Students in a physics class measured the speed of the steel ball as it rolled down a long ramp. The graph shown is a record of their measurements. What does the graph tell you about the speed of the steel ball?
a)
the ball moved down the ramp at a constant speed
b)
the started out fast, then slowed down, then increased its speed again
c)
the ball started fast and began to slow down
d)
the ball started slowly then began to move faster down the ramp
9.
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?
a)
A
b)
B
c)
C
d)
D
10.
Which of these situations could be represented by this graph?
a)
A student walks 1.5 km to a friend's house in 40 minutes. The two students then walk another 1.5 km to school in 20 minutes
b)
A student walks 1.5 km to a friend's house in 20 minutes. The two students then walk another 1.5 km to school in 40 minutes
c)
A student walks 1.5 km to a friend's house in 30 minutes. The two students then walk another 1.5 km to school in 30 minutes
d)
A student walks 1.5 km to a friend's house in 20 minutes. The two students then walk another 1.5 km to school in 60 minutes
11.
The three vehicles shown are all traveling at a speed of 15 m/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
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
12.
What is the difference between the velocity and the speed of an object?
a)
velocity is the change in distance over time, while speed is the change in velocity over time
b)
velocity has a direction associated with it, while speed has no specific direction
c)
velocity has no direction associated with it, while speed has a specific direction
d)
velocity is the change in speed over time, while speed is the change is distance over time
13.
The car a person is riding in stops suddenly. The person is not wearing a seat belt. Newton's Laws state that the person's body will --
a)
stop with the car
b)
continue to move straight ahead
c)
move suddenly backward
d)
move to one side
14.
A hockey stick hits a puck on the ice. With respect to Newton's third law of motion, identify an action-reaction pair in terms of objects and forces
a)
the stick on the puck; the puck on the stick
b)
the stick on the puck; the puck on the ice
c)
the puck on the stick; the stick on the ice
d)
the stick on the ice; the ice on the puck
15.
Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?
a)
the car with the smaller mass will require less force to stop than the car with the larger mass
b)
the car with the larger mass will maintain its velocity while traveling down the hill
c)
the car with the smaller mass will take longer to stop than the car with the larger mass
d)
the car with the larger mass will have less inertia than the car with the smaller mass
16.
The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table. Which vehicle has the greatest acceleration as it enters the highway?
a)
sedan
b)
coupe
c)
SUV
d)
truck
17.
A motorcycle traveling 35 mi/hr slows as it approaches a stop sign. This is an example of __________.
a)
acceleration
b)
distance
c)
speed
d)
velocity
18.
A released balloon flies across the room. The balloon slows down as the forces become __________.
a)
balanced
b)
frictional
c)
restricted
d)
unbalanced
19.
Julio pushes a box up a ramp into a moving truck. Geoffrey lifts the box straight up into the moving truck. Geoffrey says that he is doing more work because lifting the box takes more energy. Is Geoffrey correct?
a)
yes, using more force to move an object does more work
b)
yes, because lifting the box straight up does the work faster
c)
no, Julio is doing more work because he has to travel farther to move the box up the ramp
d)
no, they are doing the same amount of work because their force multiplied by their distance is the same
20.
Newton's third law of motion is summarized as the law of action-reaction. For every action, there is an equal but opposite reaction. Which example best illustrates the application of Newton's law of action-reaction?
a)
a baseball flying through the air
b)
a ball being dropped from the roof of a building
c)
the air rushing out of a balloon, causing it to move across the room
d)
going forward in your seat after the brakes are quickly applied in the car
21.
Look closely at the diagram that shows a roller coaster at various points along the ride. Why would it make sense for the first hill on many roller coaster rides to be the highest?
a)
the high potential energy at the start can help the roller coaster climb the next hills if they are lower than the first one
b)
the total energy of the roller coaster will increase as the ride progresses, so the car must have the most potential energy at the start
c)
the roller coaster will have more potential energy as it progresses through the ride, so the car must have the least potential energy at the start
d)
the roller coaster will convert kinetic energy into potential energy after the first hill, so the car must have the least potential energy at the start
22.
When a car suddenly stops at a red light, a book lying on the car seat slides forward. Why does the book continue to move forward?
a)
the book loses its backward force
b)
the book's inertia causes it to continue moving
c)
the friction of braking transfers energy to the book
d)
the car moves in reverse more rapidly than the book
23.
Which line does not show a constant speed at any point during the movement of the object?
a)
A
b)
B
c)
C
d)
D
24.
Which line shows that the object returns to the position where it started?
a)
A
b)
B
c)
C
d)
D
25.
When a lion eats a zebra and then uses the energy from the zebra to run, the lion's body converts --
a)
chemical energy to mechanical energy
b)
electrical energy to chemical energy
c)
chemical energy to light energy
d)
mechanical energy to chemical energy
26.
Which answer correctly classifies potential and kinetic energy in the activities shown in the picture?
a)
girl swimming: potential energy
boy on diving board: kinetic energy
girl hitting volleyball: potential energy
boy holding volleyball: kinetic energy
boy on diving board: kinetic energy
girl hitting volleyball: potential energy
boy holding volleyball: kinetic energy
b)
girl swimming: potential
boy on diving board: potential
girl hitting volleyball: kinetic
boy holding volleyball: kinetic
boy on diving board: potential
girl hitting volleyball: kinetic
boy holding volleyball: kinetic
c)
girl swimming: kinetic
boy on diving board: kinetic
girl hitting volleyball: potential
boy holding volleyball: potential
boy on diving board: kinetic
girl hitting volleyball: potential
boy holding volleyball: potential
d)
girl swimming: kinetic
boy on diving board: potential
girl hitting volleyball: kinetic
boy holding volleyball: potential
boy on diving board: potential
girl hitting volleyball: kinetic
boy holding volleyball: potential
27.
A bike racer travels 17 mi/hr in a southerly direction. This is an example of --
a)
distance
b)
speed
c)
velocity
d)
acceleration
28.
A student sitting in a wheelchair at rest throws a basketball forward. Since the student and the wheelchair have greater mass than the basketball, the student and the wheel chair will --
a)
have the same forward force as the basketball
b)
travel the same distance as the basketball but in the opposite direction
c)
move backward at a faster speed than the basketball moves forward
d)
move backward at a slower speed than the basketball moves forward
29.
The diagram shows a hot air balloon rising. Propane gas tanks are seen at the bottom of the balloon. What energy transformations occur when propane gas is used to lift the balloon?
a)
mechanical to light to chemical
b)
chemical to mechanical to thermal
c)
thermal to chemical to light
d)
chemical to thermal to mechanical
30.
Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?
a)
the car with the smaller mass will require less force to stop than the car with the larger mass
b)
the car with the larger mass will maintain its velocity while traveling down the hill
c)
the car with the smaller mass will take longer to stop than the car with the larger mass
d)
the car with the larger mass will have less inertia than the car with the smaller mass
31.
Based on the observations during the track meet, the runners do not accelerate during --
a)
segment A
b)
segment A and C
c)
segment B and C
d)
segment C and D
32.
Diedra set up the equipment shown to study energy transformations. Which energy transformation occurs between A and B?
a)
light energy to chemical energy
b)
chemical energy to electrical energy
c)
electrical energy to light energy
d)
chemical energy to sound energy
33.
How much force is needed to accelerate a 3 kg toy car at a rate of 1.5 m/s2?
a)
4.5 N
b)
4.0 N
c)
0.5 N
d)
2.0 N
34.
What is the net force shown in the diagram?
a)
20 N
b)
1.4 N
c)
110 N
d)
30 N
100 %
