Forces Review (From Textbook)
- 1. Friction is present whenever surfaces _________
A) look like simple machines
B) are smooth
C) break open
D) touch
- 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) balanced forces
B) force fields
C) air forces
D) unbalanced forces
- 5. Ships made of steel are still able to float
A) True
B) false
- 6. Levers have _________ parts
A) two
B) three
C) four
D) one
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) No
B) more
C) less
D) 2 times as much
- 8. Which simple machine does a flagpole make use of?
A) pulley
B) screw
C) lever
D) inclined plane
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) inclined plane
B) pulley
C) lawn tractor
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) pulleys
B) wedges
C) screws
D) inclined planes
- 12. What causes a ship to float in water?
A) buoyant force
B) Aquaman
C) magnetic force
D) fish
- 13. Which simple machine is part of a screw?
A) fulcrum
B) pulley
C) inclined plane
D) wheel and axle
- 14. Work uses force to move an object through a _________
A) distance
B) pulley
C) wall
D) magnetic field
- 15. A ____________ is an example of a simple machine called an inclined plane
A) car
B) pencil sharpener
C) flagpole
D) ramp
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