1. Objects in motion will remain in motion unless a force acts on it.
e.g. If a spaceship in space was in motion there is no gravity so it will keep going unless another force acts on it.
e.g. If a car was in motion it will eventually stop because of the two forces air resistance and friction.
2. F=MA = Acceleration is produced when a force acts on mass. The greater the mass the greater amount of force is needed.
e.g. If a car that weighs 1,000 kg is out of gas and it is pushed .05 m/s/s then the amount of force that is needed is =1,000 x 0.05= 50 N.
3. Whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
e.g. If a rocket’s action is to push down on the ground with the force of its powerful engines and the reaction is that the ground pushes the rocket upwards with an equal force.
Sunday, February 28, 2010
Tools and Equipment, Part 1Activity- Inclined Plane Worksheet
Results:
1. We measured only using (Input force/Output force, Output force/Input force).
2. Station 1.
Conclusion:
1. Yes, because the measurements are right. Although the force measurements are either larger or smaller than the measurement result. This is because the force measurement is effected by friction in a great way.
2. Ramp, it would be a bit steep so it will be able to go up the construction site.
3. Measurements (Newtons and cm)
1. We measured only using (Input force/Output force, Output force/Input force).
2. Station 1.
Conclusion:
1. Yes, because the measurements are right. Although the force measurements are either larger or smaller than the measurement result. This is because the force measurement is effected by friction in a great way.
2. Ramp, it would be a bit steep so it will be able to go up the construction site.
3. Measurements (Newtons and cm)
Sunday, February 21, 2010
Work and Machines
P.80 Q.1-5
1.
a) Say that doing work is 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 the mower.
b) Yes, because as you are cleaning your teeth you are pushing and pulling the tooth brush.
c) Yes, because you are pushing on the pedal of the bike.
d) No, because you are not moving will reading the paper.
3. Your body needs chemical energy to be able to do any work.
4. Spanners, pliers, and can openers are called machines because in each one of them you have to push or pull.
5. Wedge, Inclined plane, Ramp, etc.
P.81 Q.1-4
1. To make a pulley system you need a pulley and a rope.
2. It is easier because the distance is more so the force he is pulling is less also it is easier because you can use your own wait.
3.
a) A chain passes on the force to the back wheels, turning them.
b) The gears change the number of times that the crankshaft turns the back wheels.
4. The difference between high gear and low gear is that high gear ha smore distance and it is easier to cycle on then low gear.
P.82 Q.1-5
1.
a) Wedges were used to split the blocks. Holes were cut in the rock and wooden wedges were hammered in. When water was poured over the wedges the wood swelled, splitting the stone.
b) Barge-like boats were used to transport the blocks up the river. These were towered by large boats which were driven by sails and oars.
c) The slaves had to pull them up huge ramps of earth. Of course they had to build the ramps first of all.
2.
a) The friction was reduced because there was less contact between the wheel and the ground.
b) A pulley
3. Sir, the picture couldn't upload.
4. One example of a wedge shape tool is a knife and it is used to cut things. A ramp is used today to for wheelchairs.
5. 25000x140= 3500000
1.
a) Say that doing work is 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 the mower.
b) Yes, because as you are cleaning your teeth you are pushing and pulling the tooth brush.
c) Yes, because you are pushing on the pedal of the bike.
d) No, because you are not moving will reading the paper.
3. Your body needs chemical energy to be able to do any work.
4. Spanners, pliers, and can openers are called machines because in each one of them you have to push or pull.
5. Wedge, Inclined plane, Ramp, etc.
P.81 Q.1-4
1. To make a pulley system you need a pulley and a rope.
2. It is easier because the distance is more so the force he is pulling is less also it is easier because you can use your own wait.
3.
a) A chain passes on the force to the back wheels, turning them.
b) The gears change the number of times that the crankshaft turns the back wheels.
4. The difference between high gear and low gear is that high gear ha smore distance and it is easier to cycle on then low gear.
P.82 Q.1-5
1.
a) Wedges were used to split the blocks. Holes were cut in the rock and wooden wedges were hammered in. When water was poured over the wedges the wood swelled, splitting the stone.
b) Barge-like boats were used to transport the blocks up the river. These were towered by large boats which were driven by sails and oars.
c) The slaves had to pull them up huge ramps of earth. Of course they had to build the ramps first of all.
2.
a) The friction was reduced because there was less contact between the wheel and the ground.
b) A pulley
3. Sir, the picture couldn't upload.
4. One example of a wedge shape tool is a knife and it is used to cut things. A ramp is used today to for wheelchairs.
5. 25000x140= 3500000
Machine, Work, and Force.
A machine is something that makes the force less which makes the work easier. To make the force easier you have to work with the mechanical advantage. E.g.
If the distance is twice as much than my force will be twice as less.
Work is moving a weight from one place to another.
Work is force X distance
W= FxD
1 Joule= NxM
e.g. 40kg X 10m/s
= 400N
Work = Force x Distance
=400Nx1meter = 400Joules
Work= 400Nx3m =1200 joules
1200 joules= Fx12 (divided by 12 divided by 12)
F= 100n
If the distance is twice as much than my force will be twice as less.
Work is moving a weight from one place to another.
Work is force X distance
W= FxD
1 Joule= NxM
e.g. 40kg X 10m/s
= 400N
Work = Force x Distance
=400Nx1meter = 400Joules
Work= 400Nx3m =1200 joules
1200 joules= Fx12 (divided by 12 divided by 12)
F= 100n
Monday, February 8, 2010
Forces
What is a force?
A force is a pull or a push.
Examples of a force?
• Magnetic Force- attraction between the North and South Poles of a magnetic metal.
• Friction- two things rub together.
• Gravity- The attraction between two objects.
• Buoyancy- The force that makes things float.
Units of a force:
The units of a force is measured in Newton (N).
Some other units of force:
1 dyne = 10-5 N
1 kilogram - force (kgf) or kilopound (kp) = 9.80665 N = 1 metric slug
1 lbf = 32.174 poundals = 1 slug
1 kgf = 2.2046 lbf
Equation of a force:
F=M x A
Force = Mass (x) Acceleration
A force is a pull or a push.
Examples of a force?
• Magnetic Force- attraction between the North and South Poles of a magnetic metal.
• Friction- two things rub together.
• Gravity- The attraction between two objects.
• Buoyancy- The force that makes things float.
Units of a force:
The units of a force is measured in Newton (N).
Some other units of force:
1 dyne = 10-5 N
1 kilogram - force (kgf) or kilopound (kp) = 9.80665 N = 1 metric slug
1 lbf = 32.174 poundals = 1 slug
1 kgf = 2.2046 lbf
Equation of a force:
F=M x A
Force = Mass (x) Acceleration
Friday, February 5, 2010
Moments
1.
a)
A(.4)=2n(.3)
A=2n(.3)÷(.4)
A=.6n÷.4
A=1.5n
b)
B(.20)=4n(.25)
B=4n(.25)÷(.20)
B= 1n÷.2
B=5
2.
a)
C(.25)=4n(.15)+1n(.4)
C=.6n+.4n÷.25
C=1n÷.25
C=4
b)
D(.3)+1n(.25)=5n(.4)
D(.3)=5n(.4)-1n(.20)
D(.3)=2-.2n
D(.3)= 1.8n÷.3
D=6
3.
W(.25)=5(.2)
W=1n÷.25
W=4
4.
a)
cw(10)=20,000(30)
cw=600,000÷10
cw=60,000
b)
The position of center of gravity holds everything together and keeps it all balanced.
a)
A(.4)=2n(.3)
A=2n(.3)÷(.4)
A=.6n÷.4
A=1.5n
b)
B(.20)=4n(.25)
B=4n(.25)÷(.20)
B= 1n÷.2
B=5
2.
a)
C(.25)=4n(.15)+1n(.4)
C=.6n+.4n÷.25
C=1n÷.25
C=4
b)
D(.3)+1n(.25)=5n(.4)
D(.3)=5n(.4)-1n(.20)
D(.3)=2-.2n
D(.3)= 1.8n÷.3
D=6
3.
W(.25)=5(.2)
W=1n÷.25
W=4
4.
a)
cw(10)=20,000(30)
cw=600,000÷10
cw=60,000
b)
The position of center of gravity holds everything together and keeps it all balanced.
What I learned from the movie Erin Brockovich!
In the movie Erin Brockovich I learnt about Hexavalent Chromium. Hexavalent chromium compounds are a group of chemical substances that contain the metallic element chromium in its positive-6 valence (Hexavalent) state. This relates to the one world because in the one world we had to understand what Hexavalent Chromium is, what Hexavalent Chromium does, and why PG and E were using it.
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