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Semester One Final Term Exam Revision
2016- 2017
Department: Science
Grade: 7
Date of the Exam:____/____/2017
Name:______________________
Section:________
You will be assessed on the following skills:
Topic
Newton's first
law
Content
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Newton's second
law
Resources
State Newton's first law
compare the effect of balanced and unbalanced
forces on an object
apply the concept of net force to determine
direction of motion
Construct and present arguments using evidence
to support the claim that gravitational
interactions are attractive and depend on the
masses of interacting objects.
INTEGRATED
State Newton's Second law
Determine the factors that affect the
acceleration of an object
calculate the acceleration, net force and
mass of an object using Newton's second law
Identify centripetal force
INTEGRATED
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SCIENCE “Mc Graw
Hill”
Pages (53-58)
SCIENCE “Mc Graw
Hill”
Pages (61-66)
Fill in the blanks
Newton's First law
1. The combination of all the forces that act on an object is the______________________ .
2. When the forces applied to an object act in the same direction, the net force is
the_______________________ of the individual forces.
3. Because forces have direction as well as strength, when you combine forces, you
also have to specify a(n)_________________________ .
4. When you combine forces in two opposite directions, one force is_____________________
and the other force is_____________________ .
5. When the forces applied to an object act in exact opposite directions, the net
force is the_________________________ of the individual positive and negative forces.
6. Forces that combine and form a net force of zero are _____________________.
7. Balanced forces have no effect on the________________________ of an object.
8. Forces that combine and form a net force that is not zero are______________________ .
9. According to_____________________________ , if the net force on an object is zero, the
motion of the object does not change.
10. When__________________ forces act on an object, the object’s velocity does
not change.
11. If unbalanced forces act on an object at rest, the object will
start____________________________ .
12. If unbalanced forces act on a moving object, the object will change
its___________________ .
13. The tendency of an object to resist a change in its motion is
called_______________________ .
14. A book sitting on a table stays in place because of________________________ .
15. If you want to make the book move, you have to push the book hard enough to overcome
the__________________ between the book and the table.
16. Directions: The diagrams below represent sliding forces applied to a large box. Write the net force applied to
each box on the line next to each diagram.
1.
2.
3.
Newton's Second law
1. Forces change an object’s motion by changing its____________ , its_______________, or both.
2. Only________________ forces can change the velocity of an object.
3. You know unbalanced forces are acting on an object that is at rest when the object
4. starts_________________________ .
5. Unbalanced forces change the _________________of a moving object.
6. If a net force acts on a moving object in the direction that the object is moving,
the object will________________________ .
7. If a net force acts on a moving object in the direction that is opposite to the
direction that the object moves, the object_______________________ .
8. Another way unbalanced forces can change the velocity of a moving object is to
change the _______________of the object’s motion.
9. The force of gravity acts on a ball that is thrown by changing the direction of the
ball, pulling it________________________ .
10. Another name for change in velocity over time is______________________ .
11. Unbalanced forces can make an object accelerate by changing the object’s_________________
,____________________ , or both.
12. According to __________________________________, the acceleration of an object is equal to the
net force acting on the object divided by the object’s mass.
13. The direction of acceleration is the same as the direction of the_______________________ .
14. The units for Newton’s second law are SI units—force is measured in_____________
; mass is measured in___________ ;acceleration is measured in___________ .
15. ________________________is any motion in which an object is moving in a
curved path.
16. _______________________ causes objects to tend to move along a straight path.
17. In circular motion, a force that acts perpendicular to the direction of motion toward the center of the
circle is called a(n)_____________________________ .
18. An object that is moving in a curve accelerates in the_____________________ of the centripetal
force.
19. Any object that circles a larger object is called a(n)__________________________ .
20. Satellites move in a circle because a(n) ___________________acts on them.
21. _______________________ is the centripetal force that acts on satellites by continuously changing
their direction of motion; this results in motion.
22. Earth’s ________________keeps the Moon in orbit around Earth.
23. The planets remain in orbit because the ____________________gravity pulls on them.
24. Practice
1. If a 6-kg bowling ball is rolled down the bowling lane with a force of 12 N, what is the acceleration of the
ball?
2. If a 16-N net force makes an object accelerate at 8 m/s2, what is the mass of the object?
3. A 0.5-kg ball accelerated at 50 m/s2. What force was applied?