Grade 7Sciencequiz16 questions

Speed and forces

Grade 7: speed = distance / time, balanced and unbalanced forces, friction and air resistance, weight and mass, newtons.

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Questions

  1. Which formula gives speed?

    • distance + time
    • distance × time
    • distance ÷ time
    • time ÷ distance
    Show answerdistance ÷ time

  2. A cyclist rides 60 km in 3 hours at a steady pace. What is her speed?

    • 180 km/h
    • 20 km/h
    • 57 km/h
    • 63 km/h
    Show answer20 km/h

  3. A car travels 150 metres in 10 seconds. What is its speed in m/s? (Answer out loud)

    Show answer15 m/s

  4. A train moves at a steady 20 m/s. How long does it take to travel 300 m?

    • 15 s
    • 280 s
    • 320 s
    • 6000 s
    Show answer15 s

  5. When two forces on an object are equal and opposite, we say they are...

    • balanced
    • friction
    • stronger
    • unbalanced
    Show answerbalanced

  6. An unbalanced force can make a moving object speed up, slow down or change direction. (True or false?)

    Show answerTrue

  7. A book rests on a table and does not move. What can you say about the forces on it?

    • Only one force acts on it
    • There are no forces
    • They are balanced
    • They are unbalanced
    Show answerThey are balanced

  8. Which force slows a sliding box as its bottom rubs along the floor?

    • friction
    • gravity
    • magnetism
    • upthrust
    Show answerfriction

  9. Which change would reduce friction between two surfaces?

    • Adding oil
    • Adding sandpaper
    • Making them rougher
    • Pressing them together harder
    Show answerAdding oil

  10. Air resistance acts on a falling parachutist and slows the fall. (True or false?)

    Show answerTrue

  11. What is the name of the force that pulls objects towards the Earth? (Answer out loud)

    Show answergravity

  12. About how many newtons is the weight of a 1 kg mass on Earth? (Answer out loud)

    Show answerAbout 10 N (9.8 N)

  13. An astronaut's mass changes when she travels from Earth to the Moon. (True or false?)

    Show answerFalse

  14. What is the unit of force?

    • joule
    • kilogram
    • metre
    • newton
    Show answernewton

  15. Which instrument is used to measure a force?

    • measuring cylinder
    • newton meter
    • stopwatch
    • thermometer
    Show answernewton meter

  16. On the Moon, an object's weight is smaller than on Earth because the Moon's...

    • air is thicker
    • friction is greater
    • gravity is weaker
    • mass is larger
    Show answergravity is weaker

Play it as a game

Memory MatchAnswer right to flip two cards. Find a word and its picture to win the pair (+2), then the class says the word.Mystery PictureEvery right answer removes a piece. Name the picture first for a big bonus.Tile GrabAnswer right to flip a tile. Points, stars, bombs and magnets that steal points.Dare BoardPick a tile first: 1 to 5 points, and the higher the tile, the harder the question. One tile is a Double dare!

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