Forces Review (From Textbook)
- 1. Friction is present whenever surfaces _________
A) are smooth
B) look like simple machines
C) touch
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) magnetic force
B) magneto
C) supernatural force
D) kryptonite
- 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) false
B) True
- 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) No
B) 2 times as much
C) more
D) less
- 8. Which simple machine does a flagpole make use of?
A) screw
B) pulley
C) lever
D) inclined plane
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) lawn tractor
B) pulley
C) inclined plane
D) wheel and axle
- 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) screws
C) pulleys
D) inclined planes
- 12. What causes a ship to float in water?
A) fish
B) buoyant force
C) magnetic force
D) Aquaman
- 13. Which simple machine is part of a screw?
A) wheel and axle
B) inclined plane
C) fulcrum
D) pulley
- 14. Work uses force to move an object through a _________
A) magnetic field
B) wall
C) pulley
D) distance
- 15. A ____________ is an example of a simple machine called an inclined plane
A) flagpole
B) car
C) ramp
D) pencil sharpener
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