Forces Review (From Textbook) - Questionário
- 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) moon
C) ocean
D) Milky Way
- 3. The force on a magnet is called __________________
A) magnetic force
B) magneto
C) supernatural force
D) kryptonite
- 4. Forces that act on an object but cancel each other out are called ___________
A) balanced forces
B) unbalanced forces
C) air forces
D) force fields
- 5. Ships made of steel are still able to float
A) false
B) True
- 6. Levers have _________ parts
A) two
B) three
C) one
D) four
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) No
B) more
C) less
D) 2 times as much
- 8. Which simple machine does a flagpole make use of?
A) lever
B) pulley
C) screw
D) inclined plane
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) inclined plane
B) pulley
C) wheel and axle
D) lawn tractor
- 10. Machines reduce the amount of work needed to do a job
A) True
B) False
- 11. A knife and chisel are both ____________
A) screws
B) pulleys
C) wedges
D) inclined planes
- 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) wheel and axle
B) inclined plane
C) pulley
D) fulcrum
- 14. Work uses force to move an object through a _________
A) distance
B) pulley
C) magnetic field
D) wall
- 15. A ____________ is an example of a simple machine called an inclined plane
A) pencil sharpener
B) flagpole
C) ramp
D) car
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