NEXT
NEXT
NEXT
NEXT
NEXT
NEXT
100
200
300
400
500
100
200
300
400
500
100
200
300
400
500
Ch 4
Vocab.
100
200
300
400
500
This ‘n
That
100
200
300
400
500
Forces
Balanced/
Unbalanced
Work,
work,
work…
0
Team One
0
Team Three
0
Team Five
0
Team Two
0
Team Four
0
Team Six
A push or pull that
causes motion.
Show Answer
force
100 Back to Board
The force of attraction
between all objects.
Show Answer
gravity
200 Back to Board
What kind of force
opposes motion?
Show Answer
friction
300 Back to Board
What kind of force is
needed to keep your
nametags on the side
of your desks?
Show Answer
Magnetic Force
400 Back to Board
Why does Mr. Heinz
only weigh 35 pounds
on the moon?
Show Answer
The force of gravity is
less on the moon.
Because the moon is smaller than Earth.
Bonus (100pts): Why
is the force of gravity
less on the moon than
Earth?
500 Back to Board
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
NO!
Balanced forces cancel
each other out, and
there is no movement.
100 Back to Board
A baseball is sitting on
the top of a cone. Are
the forces balanced or
unbalanced?
Show Answer
Balanced
Bonus (100pts.) How
can you make the
forces unbalanced?
Hit the ball!
200 Back to Board
Mr. Doofus and Mr. Doright are arm wrestling.
Mr. Doofus exerts a force
of 20 N to the left. Mr. Doright exerts a force of 30 N
to the right. What is the
net force?
Show Answer
10 N to the right
Mr. Do-right wins!
300 Back to Board
Why is it easer to lift a
heavy weight that is
under water, than on
land?
Show Answer
Buoyant forces push up
on objects that are in
water.
400 Back to Board
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
A bar that makes it
easier to move things.
Show Answer
lever
100 Back to Board
True or False?
Simple machines make
less work. Why?
Show Answer
False.
Simple machines make
work easier, not less
work.
200 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
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.
300 Back to Board
Match the name of the simple
machine to its picture.
A
1. Inclined Plane
B
2. Lever
3. Wedge
C
4. Pulley
D
5. Wheel and Axle
E
Show Answer
Bonus (100pts): Which simple machine is
actually 2 inclined planes put together?
A
1. Inclined Plane
B
2. Lever
3. Wedge
4. Pulley
5. Wheel and Axle
C
D
E
400 Back to Board
Which ones are compound machines?
4
3
1
2
7
5
6
Show Answer
500 Back to Board
A device, made only of
a few parts that makes
work easier.
Show Answer
Simple machine
100 Back to Board
A ramp or sloping
surface.
Show Answer
Inclined Plane
200 Back to Board
A wheel with a groove
for a rope.
Show Answer
pulley
300 Back to Board
A device made up of 2
or more simple
machines.
Show Answer
Compound Machine
400 Back to Board
The balance point of a
lever.
Show Answer
Fulcrum
Bonus (100pts) Draw an arrow to the fulcrum on this wheel
barrow.
500 Back to Board
What kind of force is
acting on this compass?
Show Answer
Magnetic forces
100 Back to Board
2 tow trucks pull on a bulldozer 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 N to the right (the direction
the tow trucks are pulling)
200 Back to Board
What type of simple
machine is a door
knob?
Show Answer
Wheel and Axle
300 Back to Board
Which simple machine
changes the direction
of the force applied?
Show Answer
A pulley
You pull down on the
rope, and the object
goes up.
400 Back to Board
Show Answer
500 Back to Board
Show Question
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?
Show Answer
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
Nice Job!
STUDY HARD!
End It