Forces Review (From Textbook)
- 1. Friction is present whenever surfaces _________
A) break open B) are smooth C) touch D) look like simple machines
- 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) magneto B) kryptonite C) supernatural force D) magnetic force
- 4. Forces that act on an object but cancel each other out are called ___________
A) unbalanced forces B) balanced 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) four B) three C) two D) one
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) 2 times as much B) No C) less D) more
- 8. Which simple machine does a flagpole make use of?
A) inclined plane B) pulley C) screw D) lever
- 9. Which simple machine makes up a pencil sharpener? (the one mounted on the wall)
A) pulley B) inclined plane 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) wedges B) pulleys C) inclined planes D) screws
- 12. What causes a ship to float in water?
A) buoyant force B) fish C) Aquaman D) magnetic force
- 13. Which simple machine is part of a screw?
A) pulley B) inclined plane C) wheel and axle D) fulcrum
- 14. Work uses force to move an object through a _________
A) wall B) distance C) magnetic field D) pulley
- 15. A ____________ is an example of a simple machine called an inclined plane
A) pencil sharpener B) ramp C) car D) flagpole
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