Tools and Equipment, Part I Activity – Inclined Plane Worksheet

Tools and Equipment, Part I Activity – Inclined Plane Worksheet

Results

1. Did you obtain different mechanical advantages for the different methods of measuring? If so, was the difference large?

Yes, the difference was not very large it was about one to three.

2. Which inclined plane had the greatest mechanical advantage?

The last inclined plane because it had a mechanical advantage of 4.45.

Conclusions

1. Does calculating mechanical advantage just with the dimensions of the inclined plane really work? That is, does the calculation describe what really happens? Write a short paragraph explaining your answer.

Calculating mechanical advantage just with the dimensions of the inclined plane does not really work because in the first two the lengths were the same but very different heights with the same mechanical advantage.

2. If you are the engineer designing a ramp for a construction site to move a wheelbarrow a height of 100 feet, which inclined plane would you use? Why?

I would use the last one because it has the closest height to 100 feet since 1 feet is equal to 3.48m and 44 is closest to and it has the lowest mechanical advantage.

3. What are some possible sources of error in this experiment?

Some of the errors might be human errors by recording and measuring the data and force meters are not very accurate.

Building a pyramid p. 82

Building a pyramid p. 82

1. a. wedges were used to split the blocks. b. to move the blocks flat bottomed boats were used to transport the blocks. c. to put the blocks into place the slaves had to build ramps.

2. a. Friction was reduced when the blocs were moved by using ramps and rollers to move the blocks so it won't be touching a rough surface. b. the invention is the pulley system it would have been easier because it would lift the block and it won't be touching the ground.

3.

4. They are used in many things like axes and lifters and scissors, also they are used in scissors since the two wedges are connected by a lever to move them.

5. The last block which was weighing 250 000N needed the most force and power to be lifted since the workers had to go up to 140m with a block weighing 250 000N.

Pulleys, gears, and other wheels p.81

Pulleys, gears, and other wheels p.81

1) To make a pulley system you need a pulley, a wheel, and a rope.

2) He can lift the engine up by pulling down on the rope, and it is easier because he can also lift it by using a far smaller force.

3) a. when the pedal is pushed the chain passes on the force to the back wheels turning them.

b. the gears change the number of times that a turn of the crankshaft turns the back wheel.

4. The difference between cycling in high gear and low gear is that when you are driving on a flat road you put the bike on high gear and when you are climbing a hill you are driving on low gear because more force needed.

Work and Machines p.80

Work and Machines p.80

1. a) doing work is meant by using a force to move an object.
b) A machine is anything which makes it easier to do work.

2. a) Yes, because you are pushing a mower and you are using a force to move the mower.
b) Yes, because you are using a force to push the brush.
c) Yes, because you are using your leg forces to move the pedals to move the bicycle.
d) Yes because you are using a force to move your eyes through the page.

3. You must eat to keep working because you need to have energy joules to push the force.

4. Spanners, pliers, and can openers are called machines because they make it easier to do work with.

5. Pulley, lever, wedge, wheel and axle, inclined planes, and screws.

What is a machine in relation to work and force.

What is a Machine?

A machine is any device that is used to decrease the amount of force needed to perform a job. There are several types of machines, there are simple ones like the ones we use everyday for example knives are wedges and scissors are both levers and wedges. Also, there are compound machines which are a mixture of simple machines. Machines are mainly used to lessen the force of doing something for humans which means making it easier.

Force

Force

1. Explain what a force is?

A force is a push or a pull of something.

2. Name 4 examples of forces and explain?

A) Friction- when two things are rubbed together.

B) Gravity-the attraction between two objects.

C) Magnetic-the attraction or repulsion between two magnetic metals.

D) Elastic Force - acts to return a spring to its actual length.

3) Units of force?

Force is measured by newtons.

4) Equation of force?

Force = mass x acceleration

Erin Brockovich.

In this One World I learned that although you are not a professional at something which in this movie is scientist or lawyer you still can help solve the case by carrying out simple experiments like Erin Brockovich when she experimented the water pollution at Hinkley, or when she took on the lawsuit and eventually she one the case while the professional lawyers from PG&E did not achieve the lawsuit. Also, I learned that chromium six or hexavalent chromium can be used as a galvanizing method since it prevents the rusting of pipes.

Moments Worksheet

Moments

Moment of a force = force x distance from pivot to force

1. a) A(0.4) = 2N (.3m)

A(0.4) = .6nm

A= .6nm/0.4m = 1.5N

b) A (0.20) = 0.25(4N)

= 1/0.20

A= 5

2. a) A (0.25) = 0.15(4N) + 0.40(1N)

= C(0.25) = 0.6N + 0.4N

= 1N/0.25

A= 4

b) D (0.3) = 0.40(5N) + 0.20(1N)

= D(0.3) = 2+0.2 = 2.2N/0.3

A= 7.3

3. A (0.25) = 0.20(5N)

A(0.25)/0.25 = 1/0.25

A= 4