4th Grade Science - Simple Machines

Check the six simple machines:
1. lever
2. car engine
3. pulley
4. screw
5. vacuum cleaner
6. wheel & axle
7. wedge
8. inclined plane
All machines help us move things by:
1. changing the size of the force applied
2. changing the direction of the force applied
3. changing both the size of the force and the direction of the force applied at the same time
4. A, B or C
When you push or pull a lever, the force you put on one part of the bar is called the _____________ .
1. effort force
2. resulting force
_____________ is done on an object when a force moves the object through a distance.
Work = Force X _____________
1. time
2. speed
3. distance
4. energy
A lever turns around a fixed point that is called the
A pair of pliers is an example of which tyoe of simple machine?
1. inclined plane
2. screw
3. lever
4. wedge
A fixed pulley changes:
1. Only the direction of the effort force.
2. Only the size of the effort force.
3. Both the direction and the size of the effort force.
A movable pulley ___________ the resulting force.
1. decrease
2. increases
3. does not change
With a pulley system, do you get more work out than you put in?
1. Yes
2. No
For simple machines like the lever, pulley, and wheel and axle, if the output force is greater than the input force, then the input distance must be __________ the output distance.
1. greater than
2. less than
3. equal to
An inclined plane changes:
1. the size of the effort force
2. the direction of the effort force
3. both the size and the direction of the effort force
4. neither the size nor the direction of the effort force
A screw, wedge and inclined plane all:
1. change only the size of the apllied force
2. change both the size and the direction of the applied force
3. change only the direction of the applied force
Two inclined planes place back to back form a _____________
An inclined plane wrapped around a pole is called a ___________.
You observe that the resulting end of a lever moves a shorter distance than the effort end. The resulting end then must move with:
1. a greater force
2. a lesser force
3. the same force
4. no force
A doorknob is an example of:
1. a pulley
2. a lever
3. a wheel and axle
4. an inclined plane
You tell your teacher you have invented a machine that produces double the work you put in. Should your teacher believe you?
1. Yes
2. No
a kitchen knife is an example of a:
1. lever
2. screw
3. wedge
4. inclined plane
You can use a lever, a pulley system, or an inclined plane to move a 50 pound rock 5 feet.
Which machine should you use for leat amount of input work?
1. the lever
2. the pulley system
3. the inclined plane
4. It doesn't matter. They all will require the same amount of input work.

4th Grade Science - Simple Machines

Quiz