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