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