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