12/14/2020
Science 10 2Q Midterm Exam
Science 10 2Q Midterm Exam
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Multiple Choice
3.
1. Determine which kind of force does not belong to the group. *
2 points
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Gravity
Magnetism
Friction
Electromotive Force
4.
2. A force that is opposite of the applied force and is perpendicular to the
contact area is called *
2 points
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weight
normal force
friction
x-component of the force
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5.
Science 10 2Q Midterm Exam
3. What is the force that passes through the center of gravity of an object?
*
2 points
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weight
gravitational force
normal force
mass
6.
4. When an unbalanced force is applied opposite the direction of a moving
2 points
object, the object will *
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accelerate.
stop.
slow down.
have no effect on the object because it is moving too fast.
7.
5. A force that opposes the direction of a moving object is called *
2 points
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static friction
net force
normal force
kinetic friction
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Science 10 2Q Midterm Exam
6. The formula for work is net force x cos A x displacement. If an object is
2 points
pushed upward along an inclined plane of 30 degree, the angle in the
formula cos A is equal to *
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180 degree.
90 degree.
30 degree.
0 degree.
9.
7. If an object at rest has a mass of 50 grams, what is the magnitude of the
2 points
force that acts on it? *
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4900N
490N
4.9N
0.49N
10.
8. When friction is considered, it will be easier to move a 100 kg object if
*
2 points
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it is pulled at an angle.
pulled horizontally.
pushed horizontally.
pushed at an angle.
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Science 10 2Q Midterm Exam
9. If the mass of an object is doubled and we want to maintain the same
2 points
acceleration, how much force must be applied? *
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half of the first force
double the first force
triple the first force
same amount of force
12.
10. If acceleration is reduced by half when the mass was double, what
2 points
can you say about the applied force? *
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It was tripled.
It was doubled.
It was halved.
It remained the same.
13.
11. A sack of rice has a mass of 50 kg. If a 100 kg man carries the sack on
2 points
his head, what is the normal force acting on the sack of rice? *
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1470N
980N
490N
Zero
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Science 10 2Q Midterm Exam
12. A 1250 kg sports car travels at 60 m/s. If the coefficient of friction
2 points
between the tire and the road is 0.4, what is the frictional force in one of
the tires? *
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49,000N
30,000N
4900N
1225N
15.
13. A normal force of 1.27N acts on an object at rest. What is the mass of
2 points
the object in grams? *
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0.13
1.3
13
130
16.
14. A 50 kg student carries a 10 kg school bag. What is the normal force
applied by the floor? *
2 points
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588N
490N
392N
98N
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Science 10 2Q Midterm Exam
17.
15. When the net force on an object moving to the right is negative, it
2 points
means that *
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the force and direction of motion are the same.
the force and direction of motion is at an angle less than 90 degree.
the force is opposite the direction of motion.
the force and direction of motion is at right angle.
Problem
Solving
A
USE THIS PROBLEM FOR THE NEXT 8 QUESTIONS.
A 5000 kg truck starts at rest and reaches a velocity of 20m/s after 10 seconds. The
coefficient of friction between the tire and road is 0.4.
Write your answer as a magnitude with a unit. Sample answer is 5 m/s^2. Mind the
space between the number and unit.
18.
1. What is the weight of the truck? *
2 points
19.
2. What is the normal force? *
2 points
20.
3. What is the frictional force? *
2 points
21.
4. What is the acceleration of the truck? *
2 points
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2 m/s^2
9.8 m/s^2
10 m/s^2
20 m/s^2
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Science 10 2Q Midterm Exam
5. What is the net force applied on the truck? *
2 points
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4900 N
5000 N
10,000 N
49,000 N
23.
6. The force applied by the engine is equal to the net force and the
2 points
frictional force. How much is it? *
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29,600 N
25, 600 N
24, 500 N
12,000 N
24.
7. What is the work done on the car? *
2 points
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1,000 Joule
10,000 Joule
100,000 Joule
1,000,000 Joule
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25.
8. How much power was exerted on the car? *
2 points
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100,000 watts
10,000 watts
1,000 watts
100 watts
USE THIS PROBLEM FOR THE NEXT 7 QUESTIONS.
A 1kg box sits at the top of a 2-meter inclined plane. The plane makes an angle of 30
degree from the floor.
Problem
Solving B
26.
Write your answer as a magnitude with a unit. Sample answer is 5 m/s^2. Mind the
space between the number and unit.
1. What is the x-component of the weight? Answer with 1 decimal only. *
2 points
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8.5 N
4.9 N
9.8 N
5.7 N
27.
2. What is the y-component of the weight? Answer with 1 decimal only. *
2 points
Mark only one oval.
8.5 N
4.9 N
9.8 N
5.7 N
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Science 10 2Q Midterm Exam
3. What is the frictional force? *
2 points
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17 N
1.7 N
0.17 N
0.017 N
29.
4. Is the object moving or not? *
2 points
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Yes
No
30.
5. What is the acceleration of the object? *
2 points
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8.5 m/s^2
4.9 m/s^2
3.2 m/s^2
2 m/s^2
31.
6. What is the work done by gravity on the object? *
2 points
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9.8 N-m
4.9 N-m
3.2 N-m
1.7 N-m
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32.
Science 10 2Q Midterm Exam
7. What is the power output? *
2 points
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8.9 watts
4.5 watts
2.9 watts
1.5 watts
33.
GREAT JOB!
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