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