Chapter 1 Practice Paper: Forces and Energy — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer in the brackets provided.

1. 1

   Which force can act without the objects touching?

   1. Agravity
   2. Bfriction
   3. Ca push from a hand
   4. Dair resistance when surfaces rub
   ( )
2. 2

   A force meter gives its reading in

   1. Ajoule.
   2. Bkilogram.
   3. Cnewton.
   4. Dwatt.
   ( )
3. 3

   A crate of books weighs 200 N. The face resting on the floor has an area of 40 cm². The pressure on the floor is

   1. A8000 N/cm².
   2. B5 N/cm².
   3. C240 N/cm².
   4. D0.2 N/cm².
   ( )
4. 4

   A 2 kg dumbbell is carried from a classroom to the Moon. Mass and weight are different quantities because

   1. Aboth are measured in newtons.
   2. Bmass changes whenever gravity changes.
   3. Cweight is the amount of matter.
   4. Dmass is the amount of matter in kilograms, and weight is the gravitational force in newtons.
   ( )
5. 5

   A drawing pin is pushed into a noticeboard more easily than a blunt rod pushed with the same force, mainly because the pin’s point

   1. Ahas a smaller area, so the pressure is higher.
   2. Bhas a larger area, so the pressure is lower.
   3. Cremoves the mass of the board.
   4. Dchanges the push into a non-contact force.
   ( )
6. 6

   A torch is left on until the cells are flat. Which statement about the energy is correct?

   1. AThe energy in the cells has been destroyed.
   2. BEnergy is measured in newtons.
   3. CThe energy has been transferred, for example as light and heat, and has not been destroyed.
   4. DA moving ball inside the torch has no energy.
   ( )
7. 7

   A 4 kg hammer is easier to lift on the Moon, but its mass is still 4 kg. On Earth its weight is about

   1. A4 N.
   2. B0.4 N.
   3. C14 N.
   4. D40 N.
   ( )
8. 8

   When two surfaces rub, friction is

   1. Aa non-contact force that pulls objects to the Earth.
   2. Ba contact force that opposes motion.
   3. Cthe unit of pressure.
   4. Da store of chemical energy.
   ( )
9. 9

   A bicycle that is moving has

   1. Akinetic energy.
   2. Bno energy, because it is not a fuel.
   3. Cweight measured in joules.
   4. Dmass measured in newtons.
   ( )
10. 10

    A power station that burns fossil fuels

    1. Acreates energy from nothing.
    2. Bhas no environmental effect.
    3. Cprovides useful energy and also releases pollutants, including carbon dioxide.
    4. Dis a contact force.
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show your working for calculations.

1. 1

   Two statues each weigh 200 N and stand on soft clay. Statue A rests on a base of 40 cm². Statue B rests on a base of 10 cm².

   1. (a)

      Calculate the pressure under each statue.

      [2]
   2. (b)

      State which statue is more likely to sink into the clay, and give the reason.

      [2]
   3. (c)

      Each statue is labelled 200 N. Name the unit of that 200.

      [1]
2. 2

   A suitcase has a mass of 6 kg. Take the weight of 1 kg on Earth as about 10 N.

   1. (a)

      Calculate the weight of the suitcase on Earth.

      weight =N[2]
   2. (b)

      State one difference between the 6 kg and the 60 N.

      [2]
   3. (c)

      Name the instrument used to measure a force in the school laboratory.

      [1]
3. 3

   A lamp is switched on, and later a rolling ball slows to a stop.

   1. (a)

      Describe the useful energy change in the lamp, and name one other form that is also produced.

      [2]
   2. (b)

      A student says friction destroyed the kinetic energy of the ball. Explain why that is wrong.

      [2]
   3. (c)

      State the unit of energy.

      [1]
4. 4

   Forces and energy sources appear in everyday situations.

   1. (a)

      A student sucks the air out of a dropping pipette that is standing in a beaker of water. Explain why water rises into the pipette.

      [2]
   2. (b)

      A night market cooks on charcoal. State one benefit of the charcoal fire for the stall, and one problem it causes in the air.

      [2]
   3. (c)

      State whether magnetism is a contact force or a non-contact force.

      [1]