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