Forces Review (From Textbook) - εξέταση
- 1. Friction is present whenever surfaces _________
A) break open
B) look like simple machines
C) touch
D) are smooth
- 2. Objects weigh more on Earth than they do the _________
A) Milky Way
B) sun
C) moon
D) ocean
- 3. The force on a magnet is called __________________
A) magneto
B) kryptonite
C) supernatural force
D) magnetic force
- 4. Forces that act on an object but cancel each other out are called ___________
A) force fields
B) balanced forces
C) air forces
D) unbalanced forces
- 5. Ships made of steel are still able to float
A) True
B) false
- 6. Levers have _________ parts
A) one
B) four
C) three
D) two
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) 2 times as much
B) more
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) wheel and axle
B) lawn tractor
C) pulley
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) Aquaman
B) magnetic force
C) buoyant force
D) fish
- 13. Which simple machine is part of a screw?
A) inclined plane
B) pulley
C) fulcrum
D) wheel and axle
- 14. Work uses force to move an object through a _________
A) magnetic field
B) distance
C) pulley
D) wall
- 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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