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- 1. Multiple Choice
Is friction helpful or not helpful in the examples below? Choose the answer
b. slowing down the moving parts of a machine:
helpful
not helpful
- 2. Multiple Choice
Is friction helpful or not helpful in the examples below? Choose the answer.
a. moving a box on rough floor
helpful
not helpful
- 3. Multiple Choice
Is friction helpful or not helpful in the examples below? Choose the answer.
c. preventing slipping on a smooth floor:
helpful
not helpful
- 4. Multiple Choice
Parts of an engine move against each other, which creates a force between them. This force slows down the motion of these parts causing the engine to heat up and get damaged.
a. What the name of this force? Choose the answer.
Push
Air resistance
Friction
Gravity
- 5. Multiple Choice
Parts of an engine move against each other, which creates a force between them. This force slows down the motion of these parts causing the engine to heat up and get damaged.
b. Certain substances can be used to reduce the effect of this force. What are these substances called? Choose the answer.
magnets
Particles
Lubricants
Matter
- 6. Multiple Choice
Parts of an engine move against each other, which creates a force between them. This force slows down the motion of these parts causing the engine to heat up and get damaged.
c. Which substance can be used in this case? Choose the answer.
Water
Air
Oil
Nitrogen
- 7. Multiple Choice
Which force slows down objects moving through air? Choose the answer.
Air resistance
Gravity
Friction
- 8. Multiple Choice
Which touching surfaces produce the most friction when moving against each other? Choose the answer.
A plastic sledge on snow
two pieces of smooth plastic
a box on a smooth floor
a box on a cement floor
- 9. Fill in the Blank
A push or a pull is a ______________.
- 10. Multiple Choice
Fill in the blanks using words from the box below.
As an object moves through air, it bumps into the air particles, which ___________ its movement. An object with a _____________ surface bumps into more air particles as it moves through air.
larger
smaller
accelerates
slows
- 11. Multiple Choice
Andrew wants to slide on the wooden floor of his bedroom.
What should he wear to slide better? Choose the answer
bumpy-sole shoe
cotton socks
rubber-sole shoe
- Answer choicesTagsAnswer choicesTags