Welcome to your Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. [ Junior school science (physics) ]When a bullet is fired from a rifle, the force on the rifle is equal to the force on the bullet. However, the energy of the bullet is greater than the energy of the recoiling rifle because the _______.Force on the bullet acts for a longer distanceBullet's momentum is greater than that of the rifleThe impulse of the bullet is moreForce on the bullet acts for a longer time2. [ Junior school science (physics) ]When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______.The sameTwice as much.Less.Four times as much3. [ Junior school science (physics) ]A drawing that uses symbols to show how the parts of an electric circuit are connected is a/an ______________Circuit diagramParallel circuitNichrome wireElectric diagram4. [ Junior school science (physics) ] If an object has kinetic energy, then it also must have _____. SpeedForceImpulseAcceleration5. [ Junior school science (physics) ]Which of the following is NOT a good insulator?IronAll of the abovePlasticGlass6. [ Junior school science (physics) ]Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate _____.More than four times as far as the slower arrow.The same distance as the slower arrow.Twice as far as the slower arrow.Four times as far as the slower arrow.7. [ Junior school science (physics) ]The kinetic energy of an object will increase the most if you _______Double the velocity of the objectDouble the temperature of the objectDouble the mass of the objectDouble the potential energy8. [ Junior school science (physics) ]If a mass is at rest, what must be applied to cause it to move?KilogramsForceVectorsSpeed9. [ Junior school science (physics) ] In order for a circuit to work, the path must be _________. SeriesClosedOpenParalled10. [ Junior school science (physics) ]Strictly speaking, a car will burn more gasoline if the car radio is turned on. This statement is ____Always true.True only if the car's engine is running.True only if the car's engine is stopped.Totally false.11. [ Junior school science (physics) ]Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h. The kinetic energy of car A is _____.Four times that of car BEqual that of car BHalf that of car BTwice that of car B12. [ Junior school science (physics) ]Electric current in a/an ____________________ circuit travels in MORE THAN ONE path.ParallelWireConnectedSeries13. [ Junior school science (physics) ]The SI unit of time isdaysminuteshoursseconds14. [ Junior school science (physics) ]The potential energy of an object is equal to _______The work done on the object to put the object into its current state.The force of gravity working on the object.The size of the object compared to its surface area.The velocity of the object divided by its mass.15. [ Junior school science (physics) ]What work is done when a mass of 5kg is raised through a vertical height of 25m (take g=10m/s²) 125J12500J1250J12.5J16. [ Junior school science (physics) ]The formula of potential energy is mgfscostscos tmgh17. [ Junior school science (physics) ]Calculate the work done in moving a body through a distance of 20m pulled along a horizontal plane by a force of 10N applied to the plane400J200J100J300J18. [ Junior school science (physics) ]An object that has kinetic energy must be ____Moving.At rest.Falling.At an elevated position.19. [ Junior school science (physics) ]If you have to push a car forward, what are the forces acting on you?Your own muscles push you down.The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you.Only gravity.No forces act on you.20. [ Junior school science (physics) ]A person jumps to the ground from a platform 10 feet high. Which of the following is true?The person has less potential energy at the top of the platform than in the air.The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.The person has more kinetic energy before they jump than after they jump.21 out of 20Time is Up!
