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) Milky Way
C) ocean
D) sun
- 3. The force on a magnet is called __________________
A) supernatural force
B) kryptonite
C) magnetic force
D) magneto
- 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) True
B) false
- 6. Levers have _________ parts
A) three
B) two
C) four
D) one
- 7. An inclined plane allows you to use ___________ force over a distance to make work easier
A) 2 times as much
B) more
C) less
D) No
- 8. Which simple machine does a flagpole make use of?
A) inclined plane
B) screw
C) lever
D) pulley
- 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) True
B) False
- 11. A knife and chisel are both ____________
A) pulleys
B) wedges
C) inclined planes
D) screws
- 12. What causes a ship to float in water?
A) fish
B) magnetic force
C) Aquaman
D) buoyant force
- 13. Which simple machine is part of a screw?
A) inclined plane
B) wheel and axle
C) fulcrum
D) pulley
- 14. Work uses force to move an object through a _________
A) pulley
B) wall
C) distance
D) magnetic field
- 15. A ____________ is an example of a simple machine called an inclined plane
A) flagpole
B) ramp
C) car
D) pencil sharpener
|
תלמידים שפתרו תרגול זה פתרו גם :