Introductory Physics Benchmark – 7
thGrade
Directions:
Take your time. Read all the directions carefully.Part I – Multiply Choice
1. Energy is properly defined as which of the following;
A. the ability to accelerate B. electricity
C. the ability to cause change or do work D. the ability to move
2. Which of the following is an example of a system?
A.a pencil sharpener B. a dirt bike C. a pair of scissors D. All are examples.
3. The higher you lift an object off the ground, the greater potential energy it will have. This is an example of which type of energy?
A. chemical energy B. mechanical energy C. gravitational energy D. nuclear energy
4. The energy which results when electrons are forced to flow in one direction through a current is known as…
A. electrical energy B. thermal energy C. solar energy D. gravitational energy
5. The energy released when molecular bonds are broken is known as which of the following?
A. nuclear energy B. chemical energy C. electrical energy D. gravitational energy
6. Energy produced from splitting the nucleus of an atom is known as which of the following?
A. nuclear energy B. electrical energy C. radiant energy D. Both A and C
7. You touch a glass of water. It feels “cool” to the touch because the thermal energy from your hand has moved into the glass. Which principle of energy transfer would best explain this?
A. Principle 1 B. Principle 2 C. Principle 3 D. Principle 4
8. Which principle of energy transfer would best describe what is happening in the diagram below?
A. Principle 1 C. Principle 3
B. Principle 2 D. Principle 4
9. Inspect the graph carefully. Is this graph flawed (wrong) in any way?
A. Yes, scale increments are uneven B. Yes, missing labels on x and y axis
C. No, this graph is not flawed D. Both A and B
10. Which of the following principle of energy transfer could you use to explain what the graph is showing?
A. Principle 1 B. Principle 2 C. Principle 3 D. Principle 4
11. In physics, energy and work is the same thing. What is the efficiency of the bike when the energy input is 400 J?
A. 350 J B. 87.5% C. 0.875 J D. 350%
12. Which of the following is TRUE about work?
A. Work = Force x Distance B. Work is only done on an object when that object moves a certain distance.
C. A unit of work is called a joule D. All are true about work
13. You and 2 friends apply a combined force of 400 N to push a piano. The amount of work done is 1200J. What distance did the piano move?
A. 3 N B. 0.333 m C. 3 m D. 3 J
14. If it takes 90 joules of work to push a desk 2 meter across a floor, what force would be needed?
15. Mechanical energy is properly defined as which of the following?
A. The sum of potential and kinetic energy acting on an object B. a push or pull force
C. the stored energy of an object due to its position D. Both A and B
16. A bowling ball weighing 250 N is lifted 2 meters over Mrs. Lopez’s head. How much potential energy does the bowling have?
A. 500 J B. 125 J C. 0.008 J D. 500 N
17. The bowling ball over Mrs. Lopez’s head is dropped. If the bowling ball has a mass of 25 g, how much kinetic energy would it have as it fell? (v = gravitational velocity)
A. 100 J B. 122.5 J C. 0.08 J D. 50 J
18. If the bowling ball had a potential energy of 100 J and a kinetic energy of 50 J, how much mechanical energy does it have?
A. 2 J B. 5,000 J C. 0.5 J D. 150 J
19. A penny which had a mass of 2 g and a weight of 20 N is dropped from a height of 10 m into a bind of sand. How much mechanical energy will the penny exert on the sand when it hits?
A. 209.8 J B. 400 J C. 8 J D. 1 J
20. Which of the following is an example of an electrical conductor?
A. rubber band B. paper clip C. penny D. Both B and c
21. Which of the following is NOT an example of an electrical insulator?
A. rubber band B. pencil C. copper wire D. tooth pick
22. All simple machines are just variations of which two simple machines;
A. lever and pulley B. lever and incline plane
C. incline plane and screw D. wheel-and-axle and pulley
23. At which point (s) in the graph was the commuter NOT accelerating?
A. Point B B. Point D C. Point A D. Points B and D
24. Point C shows a sloping line. What does this indicate about the acceleration of the commuter during that time?
A. The commuter was slowing down B. The commuter was speeding up
C. The commuter was not accelerating D. The commuter was decelerating
25. The illustration provided shows two soccer players preparing to kick a soccer ball on opposite ends with different amounts of force. What will be the direction and net force acting on the soccer ball?
A. Right, 50 J B. Left 200 N C. Right, 50 N D. Left, 50 N
26. A car starts traveling from Wilmington to Leland at 40 mph. Five seconds later, the car is traveling at 60 mph. What is the car’s rate of acceleration?
A. 20 mph/s B. -4 mph/s C. 4 mph/s D. The car does not accelerate
27. If you could accelerate at a rate of 2.7 mph/s, how fast will you be traveling at 4 sec?
A. 12.8 mph B. 10.8 mph/s C. 10.8 mph D. 0.675 mph
28. Which of the following is not an example of acceleration?
A. A car slowly coming to a complete stop B. A man sitting on a park bench
C. A cat jumping from the couch onto the floor D. All are examples of acceleration
A. speed B. acceleration C. velocity D. constant speed
30. You arrive in my class 55 seconds after leaving history which is 10 meters away. How fast did you travel?
A. 0.1818 mph/s B. 0.1818 m/s C. 5.5 m/s D. 5.5 mph
31. How much time will it take for an ant to travel 3 meters across the floor if it is traveling at 1 m/s?
A. 3 m B. 0.33 sec C. 3 m/s D. 3 sec
32. Motion is properly defined as which of the following?
A. Movement B. A change over time
C. A reference point D. A change in position over time from a starting point
33. Which of the following would be the best graph to use when comparing things between different groups?
A. line graph B. bar graph C. pie graph D. It doesn’t matter
34. In what situation would a line graph be the best graph to show your data?
A. When your data compare things between different groups B. When your data compares parts to a whole
C. When your data is about cool scientific stuff D. When showing how something changes over time
35. You want to graph data about how one part compare to a whole. What would be the best graph to use?
A. bar graph B. line graph C. pie graph D. Any graph will do the job
36. According to the scientific method, what is the first step to thinking scientifically?
A. Research B. Make a hypothesis
C. Ask a question D. Test
37. After you have made tested your hypothesis, what is the next step in the scientific method?
A. Give up B. Analyze your data C. Research your hypothesis D. Draw conclusions
For questions 38-40, draw an NEAT, CLEAR, and ACCURATE diagram of each concept listed below. Be sure to add labels. (No labels = No credit).
Basic Circuit Series Circuit Parallel Circuit
Part III – Graphing
41. Use the graph paper below to make a line graph of the data in the table.
Time (sec) Runner 1 (mph)
Speed of Dirt Bike 2 (mph)
0 0 0
1 5 5
2 7 10
3 10 10
4 10 10
5 10 10
6 0 0
For problems 42-43, choose TWO questions to response to. You only have to do TWO. All responses must be in complete sentences. You may do more for extra credit, but the response must be correct.
1. How does the incline plane make work “easier”?
2. How does mass affect an object’s acceleration?
3. Explain why the swinging bucket never hit Mr. Johnson in the face?
4. How does the lever make work “easier”?
5. What was your favorite and least favorite topic this quarter? Explain why.
