1st Periodical Test g8 2016 2
1st Periodical Test g8 2016 2
Date:_________
Multiple Choice: Read each statement carefully and write only the letter of the correct answer.
1. A book is at rest on top of a table. Which of the following is correct?
A. There is no force acting on the book.
D. The book is in equilibrium.
B. The book has no inertia.
C. There is no force acting on the table.
2. Which of the following situations involves friction?
A. A bicycle rolling down a hill
D. All of the above experience some friction.
B. A baseball player sliding into 2nd base C. A diver falling through the air to a pool
3. What is gravity?
A. Newtons first law
B. The force that objects exert on each other because of their masses
C The downward pull on the Earth
D. The friction that an object has put on it
4. Which is the best example of gravity?
A. A car hits a tree, and its motion stops
D. A person drops a ball, and it falls to the ground
B. A breeze blows, and a sailboat moves
C. A book is pushed, and it moves across the table
5. How does Earth s gravity affect objects near Earth?
A. It pushes them away. B. It pulls them in C. It makes them larger. D. It makes them move faster.
6. ______________ refers to when a force is equal and opposite.
A. balanced force B. unbalanced force
C. magnitude
D. friction
7. When one force in a pair is greater than the other, we call this:
A. balanced force B. unbalanced force
C. magnitude
D. friction
8. If two forces are acting on an object they are equal in magnitude
A. and equal in direction B. and in opposite direction C. cancel each other D. none of the above
For question no 9 and 10 refer to the diagram below.
Two tugboats are moving a barge. Tugboat A exerts a force of 3000 N to the left. Tugboat B exerts a
force of 5000N in the same direction.
39. Which of the following 10 N forces acting over 10 m would produce the most work?