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