Forces Review (From Textbook)
- 1. Friction is present whenever surfaces _________
A) break open
B) touch
C) are smooth
D) look like simple machines
- 2. Objects weigh more on Earth than they do the _________
A) moon
B) ocean
C) sun
D) Milky Way
- 3. The force on a magnet is called __________________
A) kryptonite
B) supernatural force
C) magneto
D) magnetic force
- 4. Forces that act on an object but cancel each other out are called ___________
A) unbalanced forces
B) air 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) four
B) three
C) one
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) screw
B) lever
C) inclined plane
D) pulley
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) lawn tractor
B) inclined plane
C) wheel and axle
D) pulley
- 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) inclined planes
D) wedges
- 12. What causes a ship to float in water?
A) Aquaman
B) fish
C) buoyant force
D) magnetic force
- 13. Which simple machine is part of a screw?
A) inclined plane
B) pulley
C) wheel and axle
D) fulcrum
- 14. Work uses force to move an object through a _________
A) pulley
B) wall
C) magnetic field
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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