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