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