Write your first and last name on a piece of paper and the title to this test. Turn it into the late work box on the bookshelf near the door in my room.
RETAKE Forces Final Test - Science 7 Unit 1
This test will determine your knowledge of Newton’s Laws, Motion, Electrostatics, Magnetism, and Gravitation.
1. Based upon the pattern of the iron shavings in the picture to the right, what is happening between the two magnets to the right?
a. The magnets have the same poles and are attracted.
b. The magnets have opposite poles and are attracted.
c. The magnets have opposite poles and are repelled.
d. The magnets have the same poles and are repelled.
2. A computer monitor is usually covered in dust because:
a. The electricity from the wall plug attracts the dust to the monitor.
b. The dust is attracted by magnets in the monitor.
c. People scuff their feet along the floor and transfer the dust to the monitor.
d. The dust is attracted by static charges on the monitor.
The following data was gathered about the motion of 4 types of bugs.
Use the graph and logical reasoning to answer the questions below.
3. Which type of bug had balanced forces (was not moving)?
a. cockroachb. antc. centipeded. ladybug
4. Which of the following claims would be accurate, based on this data?
a. Ladybugs are attracted to cookie crumbs.
b. Cockroaches are attracted to cookie crumbs.
c. Centipedes are attracted to cookie crumbs
d. Centipedes are not attracted to cookie crumbs.
5. The amount of electricity produced in an electromagnet can be increased by
a. increasing the number of coils of wire in the electromagnet.
b. increasing the number of magnets rotating outside the coils of wire.
c. increasing the strength of the battery attached to the coils of wire.
d. all of the above will increase the amount of electricity produced by an electromagnet.
6. A boy is riding on a skateboard in a forward motion. His wheel suddenly hits a deep crack in the sidewalk and he flies off the front of the board. Which statement below is true?
a. The skateboard stopped, but the boy did not stop because of inertia.
b. The boy stopped because of gravity.
c. The skateboard had too much inertia, which is why it stopped.
7. Which of the following is NOT an at-a-distance force?
a. gravitation b. frictionc. static electricity d. magnetism
8. According to Newton’s Second Law, F=ma,the most force would be produced by which mass?
a. 100 gb. 1,000 gc. 400 gd. 4,000 g
9. Which of the arrows in this diagram represents the
“Gravitational” force?
a. F3 because it is the weight pushing down.
b. F1 because it is the pull on the rope.
c. F4 because it is the friction on the table.
d. F2 because it is the table pushing up.
10. A student in gym class is doing “wall-push ups.” If the kid’s hands exert a force of
200 N on the wall, what is the reaction force exerted by the wall on the hands?
a. 100 Nb. 1,000 Nc. 200 Nd. 50 N
11. Objects with similar charges ____, and objects with opposite charges _____.
a. attract, attract
b. repel, attract
c. attract, repel
d. repel, repel
12. An astronaut’s ______does not change, but his ______changes, depending on the ______of the planet he/she is on.
a. weight, force, sizec. weight, mass, force
b. mass, weight, gravityd. gravity, size, weight
13. Make an inference based on what you know about Newton’s Laws: Which mass would cause the most force to be exerted on a spring?
a. 100 gb. 400 gc. 700 gd. 1,000 g
A magician performs a “trick” depicted in the pictures below
BEFORE FINGER FLICKS PAPER AFTER
14. Why didn’t the coin move off of the cup along with the paper?
a. The coin’s inertia made it move down because gravity always pulls down.
b. The inertia of the paper made the coin fall towards gravity.
c. A force pushed the paper away, but there was no force moving the coin, except gravity pulled it down.
d. Newton’s First Law says that the coin wanted to move downward.
15. Which of these instruments measures an object’s weight in Newtons?
a. spring scaleb. digital scalec. triple beam balanced. all of these
Some students conducted an experiment by rolling several spheres down a ramp then onto the smooth, flat floor of their classroom. They measured how far each sphere would travel after leaving the ramp. Their experiment data is below in both table and graph format. Use this data to answer the following questions:
Mass of sphere (g) / Distance Traveled on Flat Surface (m)BB / 0.02 / 0.9
Small Marble / 1.5 / 2.7
Large Marble / 3 / 4.5
Golf Ball / 9.5 / 9.1
16. What was most likely the question or problem these students were trying to investigate?
a. Will a ball roll down a ramp?
b. What are the effects of friction on a ball rolling down a ramp?
c. What are the effects of mass on travel distance of a ball after rolling down a ramp?
d. What are the effects of sphere size on the travel distance of a ball after rolling down a ramp?
17. The gravity on the moon is less than the gravity of the earth because
a. the moon is closer to the sun b. the earth has more mass c. the moon has more mass
In a simulation, some students dropped a virtual pumpkin on to the surface of several virtual planets. Here is the data:
Planet / Mass of planet (kg) / Acceleration due to gravity on this planet (m/s2) / Mass of pumpkin dropped to surface of this planet (kg) / Weight of pumpkin on this planetMercury / 3.285 x 1023 / 3.72 / 18.0 / 66.96
Earth / 5.972 x 1024 / 9.80 / 18.0 / 176.4
Jupiter / 1.898 x 1027 / 24.79 / 18.0
18. What was the weight of the pumpkin on Jupiter?
a. 446.22 kg b. 24.79 lbs c. 18.0 kg d. 446.22 N
19. Why does the pumpkin weigh more on Jupiter than on Earth?
a. Jupiter has a larger diameter, compared to Earth, which causes a larger gravitational pull.
b. Jupiter has a larger mass, compared to Earth, which causes a larger gravitational pull.
c. Jupiter is farther from the Sun than Earth, which causes a larger gravitational pull.
d. All of the above contribute to the larger gravitational pull of Jupiter, compared to Earth.
20. What will happen when a balloon is rubbed onto a sweater?
a. Some of the negative charges will move to the balloon.b. All of the negative charges will move to the balloon.
c. Some of the positive charges will move to the balloon
d. All of the positive charges will move to the balloon.
21. The two factors that affect gravity are:
a. density and weight
b. mass and distance
c. weight and distance
d. none of these
22-29. Fill in this chart with the knowledge you gained in science class during this unit.
Tool / What does it measure?(mass or weight) / Units (grams, pounds, Newtons)
Spring Scale / 22. / 23.
Digital Balance / 24. / 25.
Bathroom Scale / 26. / 27.
Triple Beam Balance / 28. / 29.
30. When you travel into outer space, you feel…
a. Heavier because your mass increases dramatically.
b. Lighter because you mass decreases dramatically.
c. Weightless because you are not on a planet, so you are not affected by gravity.