Review for Science Test: Chapter 11

  1.  A pair of scissors is a kind of simple machine called a ______. (lever)

2.  When two moving things rub together, they slow down due to ______. (friction)

3.  A simple machine with a slanted surface is a _______. (ramp)

4.  It is easy to move a load from one place to another with a ________. (simple machine)

5.  A push or a pull is called a ________. (force)

6.  A lever is a bar that rests on a fixed point or _____. (fulcrum)

7.  Raindrops fall toward Earth due to ______. (gravity)

8.  How are a push and gravity alike? (Both are forces)

9.  Which object needs the greatest force to move? A leaf, a bicycle, a balloon or a golf ball (a bicycle)

10.  How are a lever and a ramp alike? (Both are simple machines)

11.  What happens to a ball when the force on it gets stronger? (It moves faster)

12.  Why is it harder to ride a bicycle over grass than over a sidewalk? (There is more friction on rough surfaces than smooth ones)

13.  Why is it harder to push something up a short, steep ramp than up a long, less steep one? (It takes more force to push something up the short, steep ramp)

14.   Why is it harder to pull a sled up a hill than down a hill? (Gravity pulls on the sled as you go uphill)

15.  You will have to draw a picture of a lever.

16.  You will have to draw a picture of a ramp.

17.  Why do people use levers and ramps? (To use less force when moving an object)