1st Mo St. Bernadette.docx

Holy Family Academy of Quezon, N. E. Inc. FIRST MONTHLY TEST SCIENCE 8 Grade 8- St. Bernadette July 18-20,2018 Name: ____________________________________________

Score: ________

I. A. Identification. Identify each situation if Work is done or No work is done. __________________1. A vendor is pushing the cart. __________________2. The students are standing properly. __________________3. Sarah is listening to the radio. __________________4. A person holding a briefcase. __________________5. A weightlifter lifts a barbell over his head. B. Identification. Identify each situation if kinetic or potential energy. __________________1. Shooting a rubber band. __________________2. Ball on the table. __________________3. A yo-yo in motion.

__________________4. Drawing a bow. __________________5. Swaying curtain.

II. Multiple Choice. Direction. Encircle the letter of the correct answer. 1. Which pairs of variables define motion? a) Speed and distance b) Time and momentum c) Change of position and passage of time d) Speed and passage of time 2. What feature of motion is described by acceleration? a) The rate at which speed changes b) How quickly final velocity is reached. c) The rate at which velocity changes. d) Whether motion is speeding up or slowing down. 3. The term interia means which of the following? The tendency of an object to a) Maintain its mass. b) Remain in motion. c) Remain in rest or motion. d) Stop the motion of other objects. 4. In Newton’s second law of motion, what is the relationship between acceleration and mass? a) Is directly proportional to the mass. b) Is inversely proportional to the mass. c) Does not depend on the mass. d) Is divided by mass 5. Which of the following equation represent Newton’s second law of motion? a) a= Fm b) a = F c) m = aF d) F = ma 6. In what way can friction reduced? a) Using a grease b) Using a wheel

c) Using oil d) Using a ball

7. A bowling ball on a bowling lane is an example of what type of friction? a) Kinetic friction c) Static friction b) Rolling friction d) Fluid friction

8. A block sitting still on the side of the ramp is an example of what type of friction? a) Kinetic friction c) Static friction b) Rolling friction d) Fluid friction 9. The direction of the frictional force on a moving object is _____________. a) Opposite to the motion of the moving object. b) The same as the motion of the moving object. c) Not going to alter the acceleration of the moving object. d) Never responsible for stopping the motion of the object.

III. Problem Solving. Solve the following problem. Use the space provided. 1. Sophia, whose mass is 52 kg, experienced a net force of 1800 N at the bottom of a roller coaster loop during her school's physics field trip to the local amusement park. Determine Sophia's acceleration at this location.

2. An object of mass 10 kg is accelerated upward at 2 m/s2. How much force is required?

3. Krisha has a mass of 68.24-kg. Determine her weight on Earth.

IV. Constructed Response. Answer the following questions. Work is done when a force is applied and moves for a distance. The Energy is that which is required to do the work, while power is the rate per unit time at which the energy or the work is covered. So for a given laborious function, the energy used is equivalent to the work done on it, while power is decided by how much time one is prepared to spend doing it. 1. How will you determine if there is work done in a given situation? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 2. What should be considered when solving problems on work, energy and power? ______________________________________________________________________________________ ______________________________________________________________________________________ _____________________________________________________________________________ 3. How do the speed and position of an object affect the amount of energy possessed by the object? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________

V. Interpretive Test. Refer to the images below and answer each question that follows in. .

A

B

C

1. What does the man do illustrated in Box A? in Box B? in Box C? _______________________________________________________________________________________ _______________________________________________________________________________________ ______________________________________________________________________________ 2. Which of activity above is easy to do? Why? _______________________________________________________________________________________ _______________________________________________________________________________________ ______________________________________________________________________________ 3. How do forces affect the motion of an object? _______________________________________________________________________________________ _______________________________________________________________________________________ ______________________________________________________________________________ 4. In general, why is doing work important to our daily lives? _______________________________________________________________________________________ _______________________________________________________________________________________ ______________________________________________________________________________