1. Simple machine Review

2. We can classify scissors as compound machines
We can classify scissors as compound machines. This is because they are composed of
a lever and a wedge.
a blade and a handle.
a lever and a pulley.
an inclined plane and a wedge.

3. An ax, which is used to split wood, distributes the force applied on its blunt face as shown in the image. The distribution of force occurs because
a wedge has three flat faces.
the sides of the wedge are inclined.
most of the force is absorbed by the blunt face.
the applied force is felt only at the sharp edge.

4. Jason wants to remove the top from a bottle of sprite
Jason wants to remove the top from a bottle of sprite. What kind of simple machine should he use as a tool?
Lever
Wheel and axle
Pulley
Inclined plane

5. Jack uses a shovel to dig a hole to plant a tree
Jack uses a shovel to dig a hole to plant a tree. A shovel is an example of a compound machine because it is made up of what two simple machines?
wheel and axle and lever
lever and wedge
screw and wedge
inclined plane and wedge

6. What type of simple machine could be used to move these window washers?
Screw
Wheel and axle
Inclined plane
Pulley

7. Which activity makes use of a pulley?
raising a flag on a tall flagpole
a tug-of-war game
tying a knot to hold down a tent
a jump-rope game

8. When you bend your arm at the elbow, the bones and muscles in your arm are acting as a system. What simple machine does this system represent?
inclined plane
Pulley
Wedge
lever

9. After trying to push his grandmother up the ramp, Joey decides to use a shorter ramp leading up to the building. Will this make it easier or more difficult to roll his grandmother up the ramp? Explain.
More difficult because the steeper slope requires more effort force to overcome gravity.
More difficult because the wheelchair's mass will increase.
Less difficult because the steeper slope requires less effort force to overcome gravity.
Less difficult because the effect of the earth's gravity on the wheelchair will decrease.

10. Moving the brick closer to the rock.
Your parents are trying to move a large rock that sits in the backyard. They use a long stick as a lever and a brick as the fulcrum, as shown in the diagram. They apply a force on the stick at the location shown by the arrow. However, the rock does not move. Which change would BEST allow your parents to move the rock?
Moving the brick closer to the rock.
Moving the brick to the other side of the rock.
Applying a smaller force at the same location on the stick.
Applying an equal force at a location farther away from the rock.

11. Which best explains why a mover using a ramp can load heavy boxes onto a truck more easily than a mover who uses only human strength?
The person using a ramp needs less force.
The person using human strength needs less force.
The ramp reduces the weight of the boxes.
Friction makes it harder to lift boxes without a ramp.

12. Which activity involves the use of a simple machine?
riding on a seesaw
flying a kite
listening to a radio
skiing down a hill

13. When doing work using simple machines, what happens when the effort distance is decreased?
The effort force is decreased.
The effort force is increased.
The resistance force is increased.
The direction of the effort force is changed.

14. The picture below shows a bottle cap and the top of the bottle
The picture below shows a bottle cap and the top of the bottle. The cap of the bottle is an example of what type of simple machine?
a lever
a pulley
a screw
a wedge

15. This man is using a block and tackle to lift a heavy bale of cotton
This man is using a block and tackle to lift a heavy bale of cotton. The block and tackle contains which simple machine?
Lever
Pulley
Wheel and axle
Inclined plane

16. Given the choices below, decide which changes would NOT help the man lift the stone.
I. Use a longer board so that the man has more board to push down on. II. Change the fulcrum's position so that it is halfway in between the stone and the man. III. Use a shorter board. IV. Move the stone closer to the fulcrum.
I and II
III and IV
II and III
I and IV