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Welcome. To. Ch. 4 Forces. Today's Topics. NEXT. Forces. NEXT. Balanced & Unbalanced. NEXT. Work, work work. NEXT. Chapter 4 Vocabulary. NEXT. Chapter 4 This 'n That. NEXT. FORCES. 100. 200. 300. 400. 500. Forces. Balanced/ Unbalanced. 100. 200. 300. 400. 500. - PowerPoint PPT Presentation
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300
400
500
100 200Forces
Balanced/ Unbalance
d
Work, work, work…
Ch 4 Vocab.
This ‘n That
100
100
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200
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400
Team OneTeam One
Team TwoTeam Two
Team ThreeTeam Three
Team FourTeam Four
Team FiveTeam Five
Team SixTeam Six
The force of gravity is less on the moon.
Bonus (100pts): Why is the force of gravity less
on the moon than Earth? 500 Back to Board
Because the moon is smaller than Earth.
One puppy pulls on a rope toy. His sister
pulls on the other end with a balanced force.
Does the rope toy move?
Show Answer
Mr. Doofus and Mr. Do-right are arm wrestling. Mr. Doofus exerts a force
of 20 N to the left. Mr. Do-right exerts a force of 30 N to the right. What is the
net force?
Show Answer
Use the words “buoyant force” to explain why a ping
pong ball floats and a golf ball sinks?
Show Answer
A ping pong ball floats because the buoyant force of water is greater than its
weight.
A golf ball sinks because the buoyant force of water
is less than its weight.500 Back to Board
Which of the following demonstrates work being done? (list them on your board)
Mr. Heinz pushing against a wall.
Mr. Heinz hammering a nail through a board.
Mr. Heinz riding his bike down the street.
Mr. Heinz jumping on a trampoline.
Mr. Heinz telling you to put your eyes on him.
Mr. Heinz sitting on his stool.
Mr. Heinz opening the door and walking out.
Mr. Heinz reading science homework.
Show Answer
300 Back to Board
Which of the following demonstrates work being done? (put a √ next to any of them)
Mr. Heinz pushing against a wall.
Mr. Heinz hammering a nail through a board.
Mr. Heinz riding his bike down the street.
Mr. Heinz jumping on a trampoline.
Mr. Heinz telling you to put your eyes on him.
Mr. Heinz sitting on his stool.
Mr. Heinz opening the door and walking out.
Mr. Heinz reading science homework.
Match the name of the simple machine to its picture.
Show Answer
1. Inclined Plane
2. Lever
3. Wedge
4. Pulley
5. Wheel and Axle
A
B
C
D
E
400 Back to Board
1. Inclined Plane
2. Lever
3. Wedge
4. Pulley
5. Wheel and Axle
Bonus (100pts): Which simple machine is actually 2 inclined planes put together?
A
B
C
D
E
Which ones are compound machines?
Show Answer
12
7
65
34
2 tow trucks pull on a bull-dozer toward the right with a
force of 1000 N each.
The bull-dozer pulls left with 1800 N.
Are the forces balanced?
Show Answer
NO!
Bonus (100pts.) What is the net force and
direction?
200 Back to Board
200 N to the right (the direction the tow trucks are pulling)
Show Answer
You want to move a large, heavy box of toys up into
your treehouse that is very high. It’s too heavy and awkward to carry up the
rope ladder. Which simple machine would help you
move it up the best ? Why?
A pulley is the best because it can be put together easily. An inclined plane would
work, but it’s too hard to put together.
To End