Take Home #14
Standard 4 Objective 3 Investigate the application of forces that act onobjects, and the resulting motion
24 Questions
1) Which one of the following simple machines is a third class lever?
A. Bumper jack
B. Crowbar
C. Fishing pole
D. Scissors
E. Wheel barrow
2) A simple machine is used to lift a weight. The force is exerted over a greater distance than it would have without the machine. What happens to the amount of force that must be exerted compared to doing the work without a machine?
A. it increases
B. it decreases
C. it stays the same
D. it can't be predicted
3) A simple machine is used to lift a weight. The force exerted is greater than it would have been without the machine. What happens to the amount of distance the force is exerted over compared to doing the work without a machine?
A. it increases
B. it decreases
C. it stays the same
D. it can't be predicted
4) A simple machine is used to lift a weight. What happens to the amount of work that must be done compared to doing the work without a machine?
A. it increases
B. it decreases
C. it stays the same
D. it depends on which simple machine is used
5) Brakes in cars work by pressing pads together within the car's wheel assembly. This resistance to the motion of the car results from:
A. Fluid friction
B. Gravity
C. Rolling friction
D. Sliding friction
6) Which of the following is the best example of sliding friction?
A. A car going down the road
B. A person sanding a board
C. A ball being pushed across a table
D. A boy climbing a greased pole
E. A boulder being moved on rolling logs
7) Henry built a machine that consisted mostly of ropes and pulleys. The machine was designed to lift his dirty laundry from his basement bedroom up and over to the laundry room. He placed a 20 pound basket of laundry on the base of the machine, pulled on the "up" rope and up the laundry went! Then he pulled on the "over" rope and it made it to the laundry room. Henry was very happy when he finally got it to work. Henry's machine
A. made his life better because now he was able to put less distance into getting his dirty laundry to the laundry room
B. made his life better because now he was able to put less force into getting his dirty laundry to the laundry room
C. made his life better because less work was done on the clothes to get them to the laundry room
D. made his life worse because now other people wanted to hire him to make them a laundry machine
8) A simple machine is used to lift a weight. The force is exerted over a lesser distance than it would have been without the machine. What happens to the amount of force that must be exerted if the work is done without a machine?
A. it increases
B. it decreases
C. it stays the same
D. it can't be predicted
9) Students wanted to see the effect different materials had on pulling a 500 g wooden block up a wooden inclined plane with a mechanical advantage of 2. They used the plain wooden inclined plane and also covered it with four different materials, one at a time. Their results are found in this table.
Was there a control in this experiment?
A. no, because there were already 5 types of material
B. no, because they didn't need one
C. yes, the inclined plane that was just plain wood
D. yes, the inclined plane that had linoleum on it
10) Students wanted to see the effect different materials had on pulling a 500 g wooden block up a wooden inclined plane with a mechanical advantage of 2. They used the plain wooden inclined plane and also covered it with four different materials, one at a time. Their results are found in the above table.
In this experiment, which variable was controlled?
A. time it took to pull the object up
B. force to pull the object up
C. type of material
D. mass of the object
11) Students wanted to see the effect different materials had on pulling a 500 g wooden block up a wooden inclined plane with a mechanical advantage of 2. They used the plain wooden inclined plane and also covered it with four different materials, one at a time. Their results are found in the above table.
In this experiment, what was the dependent, or responding, variable?
A. force to pull the object up the plane
B. mechanical advantage of the inclined plane
C. mass of the object being pulled up
D. type of material covering the inclined plane
12) Students wanted to see the effect different materials had on pulling a 500 g wooden block up a wooden inclined plane with a mechanical advantage of 2. They used the plain wooden inclined plane and also covered it with four different materials, one at a time. Their results are found in the above table.
In this experiment, what was the independent, or manipulated, variable?
A. friction
B. force to pull object up
C. mass of the object
D. type of material
13) Students wanted to see the effect different materials had on pulling a 500 g wooden block up a wooden inclined plane with a mechanical advantage of 2. They used the plain wooden inclined plane and also covered it with four different materials, one at a time. Their results are found in the above table.
Which substance resulted in the least amount of friction?
A. foam rubber
B. sand paper
C. linoleum
D. plain wood
14) Students wanted to see the effect different materials had on pulling a 500 g wooden block up a wooden inclined plane with a mechanical advantage of 2. They used the plain wooden inclined plane and also covered it with four different materials, one at a time. Their results are found in the above table.
Which substance resulted in the most friction pulling the object up the plane?
A. foam rubber
B. sand paper
C. short pile carpet
D. plain wood
15)How could the mechanical advantage of this inclined plane be increased?
A. make the height taller
B. increase the weight
C. decrease the weight
D. make the plane longer
16)How could you increase the mechanical advantage of this lever?
A. move the fulcrum farther from the weight
B. move the fulcrum closer to the weight
C. make the weight lighter
D. make the weight heavier
17)What simple machines are found in the wheelbarrow?
A. inclined plane, lever
B. lever, pulley
C. pulley, inclined plane
D. wheel, lever
18) Use this picture to answer the following question: If the blades of the scissors were lengthened, what would happen to the amount of force exerted attheir tip?
A. It would not change
B. It would increase
C. It would decrease
D. It would be easier to cut tough materials
19) Which of the following describes the mathematical relationship between the length of the arms on alever?
A. the longer the effort arm, the less the force needed to lift a mass
B. the longer the effort arm, the greater the force needed to lift a mass
C. the longer the resistance arm, the less the force needed to lift a mass
D. the shorter the resistance arm, the greater the force needed to lift a mass.
20) Two levers were built and the effort measured as they lifted a 2 kg object by 10 cm. The effort foreach is listed below:
Lever A 2 kg
Lever B 4 kg
Which lever did the most work?
A. A
B. B
C. They did the same amount of work.
D. The amount of work cannot be measured.
21) Which drawing shows a lever that would need the least effort force to lift the weight?
A.B.
C.D.
22) Four levers were built and the effort measured as they lifted the same object. The effort for eachis listed below:
Lever A 0.5 kg
Lever B 1 kg
Lever C 2 kg
Lever D 4 kg
Which lever has the greatest mechanical advantage?
A. A
B. B
C. C
D. D
23) A student learned about levers in science class. Using this knowledge, which tool should thestudent chose to help move a large rock?
A. a hammer
B. a Phillips screwdriver
C. a short-handled shovel
D. a long-handled shovel
24) Groups of science students were given a collection of parts and asked to make a car that would rolldown a ramp using gravity. The groups created many different types of cars that could all roll downthe ramp. What aspect of science does this show?
A. there are many ways to solve a problem in science.
B. all science projects will work if the goal is the same.
C. not all science projects use gravity to solve a problem.
D. most science experiments use gravity to solve a problem.