Friction and drag Quiz
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5 questions, one answer each
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1. Which action reduces friction?
- A. Fitting tyres with deep treads on an icy road
- B. Putting oil between two moving metal parts
- C. Roughening the soles of a pair of shoes
- D. Pressing two surfaces together harder
2. A 20 N push does not move a box on the floor. What is the friction force on the box?
- A. 20 N, opposite to the push
- B. 0 N
- C. 40 N, opposite to the push
- D. 20 N, in the same direction as the push
3. A parachutist falls at terminal velocity. Which statement is correct?
- A. Her weight is greater than the air resistance
- B. The air resistance is zero
- C. The air resistance equals her weight
- D. She is still accelerating downwards
4. Which change reduces the air resistance on a cyclist?
- A. Sitting upright
- B. Wearing loose clothing
- C. Holding wider handlebars
- D. Crouching low to present a smaller front area
5. Why is a heavy box easier to keep sliding than to start moving?
- A. Sliding friction is usually smaller than the maximum static friction
- B. Static friction is always zero
- C. The box gets lighter when it moves
- D. Air resistance helps to push the box