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Olympiad (Class 5) Force and energy — practice questions — page 2

Explore 66 free Force and energy questions in Olympiad (Class 5) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Force and energy questions and exercises with answers

Showing questions 31–60 of 66.

Walking on a wet, smooth tile floor is risky mainly because there isRead the answer and worked solution →Football shoes have studs and a rough sole mainly toRead the answer and worked solution →The soles of shoes become thin after months of walking. This happens because friction causesRead the answer and worked solution →Which force mainly slows a swimmer moving through water?Read the answer and worked solution →A simple machine is a device that can change a force'sRead the answer and worked solution →Which of these is NOT one of the six classical simple machines?Read the answer and worked solution →A seesaw in a park is an example of which simple machine?Read the answer and worked solution →In a crowbar used to lift a rock, the fixed point on which the bar turns is called theRead the answer and worked solution →Workers slide a heavy drum up a sloping plank into a truck. The plank works as which simple machine?Read the answer and worked solution →A knife blade splits an apple because the blade acts as aRead the answer and worked solution →A flag is raised by pulling a rope that runs over a wheel at the top of a pole. This wheel is aRead the answer and worked solution →A single fixed pulley helps to lift a load mainly because it changes theRead the answer and worked solution →A bus steering wheel is a large wheel fixed on a shaft. It is aRead the answer and worked solution →The spiral thread on a bolt makes it which simple machine?Read the answer and worked solution →A bicycle uses wheels, levers and pulleys together, so it is best called aRead the answer and worked solution →A longer ramp needs less pushing force to raise a load to the same height, but the load mustRead the answer and worked solution →A machine lets a 20 N effort lift a 100 N load. What is its mechanical advantage?Read the answer and worked solution →Machines with mechanical advantages 2 and 3 are joined into one. The combined advantage isRead the answer and worked solution →Ignoring friction, how does the work done on the load by a simple machine compare with the work put in?Read the answer and worked solution →Work and energy are both measured in which SI unit?Read the answer and worked solution →A boy pushes a box with a force of 10 N and moves it 3 m. How much work does he do?Read the answer and worked solution →A steady force of 20 N does 100 J of work on a trolley. How far does the trolley move?Read the answer and worked solution →Pushing with a force of 1 newton through a distance of 1 metre does work equal toRead the answer and worked solution →Which unit measures how much energy a bulb uses every second?Read the answer and worked solution →A kettle is rated 2000 W. How much energy does it use every second?Read the answer and worked solution →Which of these has kinetic energy?Read the answer and worked solution →A stone held high above the ground stores energy because of its position. This is calledRead the answer and worked solution →A cyclist starts from rest and speeds up along a flat road. Her kinetic energyRead the answer and worked solution →A stretched rubber band is held ready to be released. Which form of energy does it store?Read the answer and worked solution →Food and fuel store energy that is released in chemical reactions. This is calledRead the answer and worked solution →

Worked practice questions

Walking on a wet, smooth tile floor is risky mainly because there is

  1. more gravity on the floor
  2. less friction between shoes and floor
  3. more friction between shoes and floor
  4. no normal force from the floor
Show answer and solution

Correct answer: B. less friction between shoes and floor

A wet smooth surface gives little friction, so shoes slip instead of gripping.

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Football shoes have studs and a rough sole mainly to

  1. reduce the weight of the shoe
  2. make the shoe slide easily
  3. stop the ground from heating
  4. raise friction and stop slipping
Show answer and solution

Correct answer: D. raise friction and stop slipping

Studs and rough soles grip the ground, increasing friction so the player can push off without slipping.

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The soles of shoes become thin after months of walking. This happens because friction causes

  1. wear
  2. growth
  3. melting
  4. magnetism
Show answer and solution

Correct answer: A. wear

Rubbing against the ground wears away tiny bits of the sole, which is a common result of friction.

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