Forces Review (From Textbook)
- 1. Friction is present whenever surfaces _________
A) look like simple machines
B) are smooth
C) touch
D) break open
- 2. Objects weigh more on Earth than they do the _________
A) Milky Way
B) sun
C) moon
D) ocean
- 3. The force on a magnet is called __________________
A) magnetic force
B) magneto
C) supernatural force
D) kryptonite
- 4. Forces that act on an object but cancel each other out are called ___________
A) air forces
B) unbalanced forces
C) force fields
D) balanced forces
- 5. Ships made of steel are still able to float
A) True
B) false
- 6. Levers have _________ parts
A) one
B) two
C) four
D) three
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) less
B) 2 times as much
C) No
D) more
- 8. Which simple machine does a flagpole make use of?
A) inclined plane
B) screw
C) lever
D) pulley
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) inclined plane
B) lawn tractor
C) pulley
D) wheel and axle
- 10. Machines reduce the amount of work needed to do a job
A) False
B) True
- 11. A knife and chisel are both ____________
A) inclined planes
B) wedges
C) screws
D) pulleys
- 12. What causes a ship to float in water?
A) buoyant force
B) magnetic force
C) Aquaman
D) fish
- 13. Which simple machine is part of a screw?
A) fulcrum
B) wheel and axle
C) inclined plane
D) pulley
- 14. Work uses force to move an object through a _________
A) distance
B) pulley
C) magnetic field
D) wall
- 15. A ____________ is an example of a simple machine called an inclined plane
A) flagpole
B) pencil sharpener
C) car
D) ramp
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