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