ENERGY

Froggy Jumps

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MULTIPLE CHOICE

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lea

Philippines

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ENERGY


Froggy Jumps ENERGYOnline version MULTIPLE CHOICE by lea 1 Two objects with masses of 2 kg and 4 kg are moving towards each other with velocities of 3 m/s and -1 m/s, respectively. What is the total momentum after the collision? a 2 kg m/s b -2 kg m/s c -4 kg m/s 2 Two marbles with a total mass of 20 kg has an initial momentum of 100 kg m/s. If the marbles stick together after the collision, what is the final velocity of the marbles? a 5 m/s b 80 m/s c 120 m/s 3 A car of mass 1000 kg collides with a stationary truck of mass 2000 kg. If the car rebounds after the collision with a velocity of 5 m/s in the opposite direction, what is the velocity of the truck immediately after the collision? a 5 m/s b 2.5 m/s c 10 m/s 4 Why does a figure skater spin faster when they pull their arms inward during a spin? a Because pulling the arms inward increases their angular velocity, conserving angular momentum. b Because pulling the arms inward decreases their angular velocity, conserving angular momentum. c Because pulling the arms inward decreases their moment of inertia, conserving angular momentum. 5 How does the concept of impulse relate to the conservation of momentum? a Impulse is the change in momentum, which is conserved in a closed system. b Impulse is the force applied over time, which violates the conservation of momentum. c Impulse is unrelated to the conservation of momentum. 6 The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is a equal b lesser c 7 Which best describes potential energy? a Stored energy b Energy as heat c Energy in motion 8 A car with a mass of 1,500 kg is traveling at a speed of 20 m/s. What is its kinetic energy? a 300,000 J b 600,000 J c 150,000 J 9 A ball is dropped from a height of 10 meters above the ground. As it falls, which of the following statements best illustrates the principle of conservation of mechanical energy? a The ball's total mechanical energy remains constant as it falls. b The ball's potential energy decreases as it falls, while its kinetic energy increases. c The ball's kinetic energy decreases as it falls, while its potential energy increases. 10 What is energy in transit called? a Heat b Thermodynamics c Temperature 11 When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done? a Heat energy b Electrical energy c Mechanical energy 12 What is a measure of how hot or cold an object is compared to a reference point? a Temperature b Thermometer c Thermodynamics 13 What energy transformation takes place in a generator? a mechanical to electrical b electrical to mechanical c heat to mechanical 14 When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done? a Heat energy b Electrical energy c Mechanical energy 15 A system’s internal energy can be changed by transferring energy by either work, heat, or a combination of the two. What Law explains the system? a First law of thermodynamics b Second law of thermodynamics c Internal energy law 16 Heat is added in our body by metabolizing food, and our body does work in breathing, walking, and other activities. If we return in the same state at the end of the day, how will you describe the work and heat of our body? a The amount of heat is equal to the work done b Internal energy is zero. c Work done is greater than the heat added 17 How do heat and work affect a system? a heat and work both contribute to the total internal energy of a system b heat and work do not affect the total internal energy of a system c heat and work affect the system in a negligible impact 18 Which method of heat transfer best illustrates the cold air in contact with the skin? a convection b conduction c radiation 19 What happens to the thermal energy when two objects at thermal equilibrium are in contact? a There is no transfer of energy b It transfers from hotter to colder object c It transfers from colder to hotter object 20 Which of the following methods of heat transfer can only happen in liquids and gases but not in solids? a convection b conduction c radiation 21 What is the reason why a wet pants can easily dry after it was put on a clothesline under the sun? a The water molecules in the pants gain energy and evaporate b The water molecules in the pants lose energy and condense c The water molecules in the pants gain energy and condense 22 The metallic, wooden, silicon-made and plastic spoons were placed on a bowl with hot soup. Which of the following will gain the lowest energy after 10 seconds in contact with hot soup on a bowl? a Metallic spoon b Wooden spoon c Silicon-made made 23 How do heat transfer and energy transformation enable a heat engine to work efficiently? a Heat transfer facilitates energy flow from a high-temperature source to a lower-temperature sink b By employing principles of thermodynamics c Heat transfer occurs between the hot reservoir and the working substance in the heat engine 24 A student lifts a 10 kg box to a height of 5 meters. What is the gravitational potential energy of the box? a 490 J b 500 J c 1000 J 25 Based on the given table below, which type of engine has the least exhausted energy? Steam turbine 29%, Diesel Engine 56%, Gasoline Engine 60% a Gasoline Engine b Diesel Engine c Steam turbine

ENERGY

Froggy Jumps

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ENERGYOnline version

by lea

Two objects with masses of 2 kg and 4 kg are moving towards each other with velocities of 3 m/s and -1 m/s, respectively. What is the total momentum after the collision?

Two marbles with a total mass of 20 kg has an initial momentum of 100 kg m/s. If the marbles stick together after the collision, what is the final velocity of the marbles?

A car of mass 1000 kg collides with a stationary truck of mass 2000 kg. If the car rebounds after the collision with a velocity of 5 m/s in the opposite direction, what is the velocity of the truck immediately after the collision?

Why does a figure skater spin faster when they pull their arms inward during a spin?

How does the concept of impulse relate to the conservation of momentum?

The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is

Which best describes potential energy?

A car with a mass of 1,500 kg is traveling at a speed of 20 m/s. What is its kinetic energy?

A ball is dropped from a height of 10 meters above the ground. As it falls, which of the following statements best illustrates the principle of conservation of mechanical energy?

What is energy in transit called?

When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done?

What is a measure of how hot or cold an object is compared to a reference point?

What energy transformation takes place in a generator?

When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done?

A system’s internal energy can be changed by transferring energy by either work, heat, or a combination of the two. What Law explains the system?

Heat is added in our body by metabolizing food, and our body does work in breathing, walking, and other activities. If we return in the same state at the end of the day, how will you describe the work and heat of our body?

How do heat and work affect a system?

Which method of heat transfer best illustrates the cold air in contact with the skin?

What happens to the thermal energy when two objects at thermal equilibrium are in contact?

Which of the following methods of heat transfer can only happen in liquids and gases but not in solids?

What is the reason why a wet pants can easily dry after it was put on a clothesline under the sun?

The metallic, wooden, silicon-made and plastic spoons were placed on a bowl with hot soup. Which of the following will gain the lowest energy after 10 seconds in contact with hot soup on a bowl?

How do heat transfer and energy transformation enable a heat engine to work efficiently?

A student lifts a 10 kg box to a height of 5 meters. What is the gravitational potential energy of the box?

Based on the given table below, which type of engine has the least exhausted energy? Steam turbine 29%, Diesel Engine 56%, Gasoline Engine 60%