Knives, axe blades, and nails are examples of
a. wedges
b. inclined planes
c. friction
d. levers
a. wedges
100
You can push a sled over ice more easily than over ground because there is less ______.
a. work
b. gravity
c. weight
d. friction
d. friction
100
Lubricants, like oil or grease, let some things move more easily by reducing _____.
a. weight
b. friction
c. mass
d. force
b. friction
200
What is force measured in?
Newtons
200
Who discovered work?
James Prescott Joule
200
When you lift someone by pushing down on a seesaw, you are using a ___.
a. joule
b. pulley
c. wedge
d. lever
d. lever
200
Rolling an object on wheels requires less force than dragging the object because...
a. the object has less weight
b. the object is lubricated
c. gravity pulls the object
d. the wheels reduce the friction
d. the wheels reduce the friction
200
The water on a waterslide causes you to go down faster than on a regular slide. This is an example of ________.
a. friction
b. lubrication
c. complex machines
d. simple machines
b. lubrication
300
Who discovered force?
Isaac Newton
300
What is the definition of work?
Using force to move an object over a distance.
300
Pulleys help us do work because they _____.
a. increase the distance
b. helps us use less force
c. change the direction of the force
d. hold two objects together.
d. change the direction of the force
300
Give two examples when friction is good.
Answers may vary.
300
Give 2 examples of lubricants.
Answers may vary.
Oil, soap, butter, WD40, etc.
400
What is the letter that force is represented by?
N
400
In which example is work being done?
A. A person looks at a painting in a museum.
B. Three adults push a stalled car, but it doesn't move.
C. A child read a page in a book.
D. A soccer player kicks a ball into the net.
D. A soccer player kicks a ball into the net.
400
Scissors are an example of _____.
a. a pair of screws
b. a pair of levers
c. a pair of wheel and axles
d. a pair of inclined planes
b. a pair of levers
400
Give 2 examples when friction is bad.
Answers may vary.
400
What are levers?
1st class:
2nd class:
3rd class:
answers may vary. Need to complete at rug as a class!
500
A push or pull on an object is called:
*Plus give one example for the full 500 points!
force
500
Most simple machines are useful because they let us do the same amount of work with less
A. efficiency
B. resistance
C. effort
D. danger
C. effort
500
The simple machine that helps move a load from one level to another by using less force, but increasing the distance is a _____.
a. wheel and axle
b. pulley
c. wedge
d. inclined plane
d. inclined plane
500
We use simple machines in our lives because ______.
a. simple machines let you do work easier and faster.
b. simple machines help lubricate things.
c. simple machines are fun to play with.
a. simple machines let you do work easier and faster.
500
What could I use on a surface to cause less friction?
a. sand
b. saw dust
c. oil
d. rocks