Forces Review (From Textbook) - חִידוֹן
- 1. Friction is present whenever surfaces _________
A) are smooth
B) break open
C) look like simple machines
D) touch
- 2. Objects weigh more on Earth than they do the _________
A) moon
B) ocean
C) sun
D) Milky Way
- 3. The force on a magnet is called __________________
A) magnetic force
B) supernatural force
C) kryptonite
D) magneto
- 4. Forces that act on an object but cancel each other out are called ___________
A) balanced forces
B) force fields
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) two
B) three
C) four
D) one
- 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) lever
B) screw
C) inclined plane
D) pulley
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) pulley
B) lawn tractor
C) inclined plane
D) wheel and axle
- 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) pulleys
C) wedges
D) screws
- 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) wheel and axle
B) inclined plane
C) fulcrum
D) pulley
- 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) car
B) flagpole
C) pencil sharpener
D) ramp
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