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