Forces Review (From Textbook)
- 1. Friction is present whenever surfaces _________
A) are smooth
B) touch
C) look like simple machines
D) break open
- 2. Objects weigh more on Earth than they do the _________
A) sun
B) ocean
C) Milky Way
D) moon
- 3. The force on a magnet is called __________________
A) magneto
B) supernatural force
C) magnetic force
D) kryptonite
- 4. Forces that act on an object but cancel each other out are called ___________
A) force fields
B) air forces
C) balanced 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) four
C) three
D) one
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) 2 times as much
B) more
C) No
D) less
- 8. Which simple machine does a flagpole make use of?
A) lever
B) inclined plane
C) pulley
D) screw
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) wheel and axle
B) pulley
C) lawn tractor
D) inclined plane
- 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) buoyant force
B) Aquaman
C) magnetic force
D) fish
- 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) distance
B) wall
C) magnetic field
D) pulley
- 15. A ____________ is an example of a simple machine called an inclined plane
A) flagpole
B) pencil sharpener
C) ramp
D) car
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