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