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Forces
Energy
Mystery Questions
Heat
Mystery Questions
100
What happens to the motion of an object when the forces acting on it are balanced? A. The motion changes direction. B. The motion does not change. C. The motion speeds up. D. The motion slows down.
B. The motion does not change
100
An apple is hanging from a tree branch. A gust of wind blows, and the apple falls. Which of the following describes the apple's energy just as the apple hits the ground? A. Its potential energy due to its position has decreased. B. Its kinetic energy due to its position has decreased. C. Its potential energy is half of its kinetic energy. D. Its kinetic energy is equal to its potential energy.
A. Its potential energy due to its position has decreased.
100
What is Kinetic Energy?
Kinetic energy is the energy of motion.
100
The earth receives energy from the sun by: A. convection B. conduction C. radiation D. temperature
C. radiation
100
The tendency of an object at rest to stay at rest is called: A. acceleration B. balanced forces C. inertia D. velocity
C. inertia
200
What happens to an object if the forces acting on it are unbalanced? A. Its motion changes. B. The net force is zero. C. Its motion doesn't change. D. The object always comes to a stop.
A. Its motion changes.
200
As a ball rolls down a hill, it has less potential energy than it did at the top of the hill. Some of the ball's potential energy: A. disappears. B. decreases friction. C. creates even more energy. D. changes to kinetic energy. energy.
D. changes to kinetic
200
What is Potential Energy?
Potential energy is the energy that an object has because of its position or condition.
200
In gases, heat is transferred mainly by: A. radiation B. electromagnetic waves C. conduction D. convection
D. convection
200
Which of the following is not a unit used to express velocity? A. km/h B. m/s C. m/h D. m/s/s
D. m/s/s
300
How is an object's mass related to the force needed to accelerate the object? A. Mass is not related to the force needed. B. The smaller the mass, the greater the force needed. C. The greater the mass, the greater the force needed. D. The greater the mass, the smaller the force needed.
C. The greater the mass, the greater the force needed.
300
Which of the following changes chemical energy into light energy? A. blender B. flashlight C. ceiling fan D. radio
B. flashlight
300
What is the law of conservation of energy?
Energy can not be created or destroyed, it can only be transformed.
300
In what direction does heat move? A. from warmer areas to cooler areas B. from cooler areas to warmer areas C. between areas of equal temperature D. in all directions
A from warmer areas to cooler areas.
300
A rock at the edge of a cliff has energy. What happens as the rock falls towards the ground below? A. Potential energy changes to thermal energy B. Kinetic energy changes to potential energy C. Kinetic energy changes to mechanical energy D. Potential energy changes to kinetic energy
D. Potential energy changes to kinetic energy
400
A student pushes on a large box of books, but the box does not move. Which of the following statements is true? A. The amount of work done is equal to the force of gravity. B. The amount of work done is equal to the force exerted times the weight of the box. C. No work is done. D. The amount of work done is equal to the force exerted.
C. No work is done.
400
Which one is an example of electrical energy being transformed into mechanical energy? A. a toy train running along a track B. a traffic light turning red C. a toaster oven browning a slice of bread D. a television screen lighting up
A. a toy train running along a track
400
When does energy transformation occur?
Energy transformation occurs when one type of energy changes to a different type of energy.
400
Your are drinking a mug of hot chocolate with a spoon in it. What method of heat transfer is occurring between the liquid and the metal spoon? A. conduction B. convection C. radiation D. temperature
A. conduction
400
A ball rolls a distance of one meter in two seconds. What is the speed of the ball? A. 2.0 m/s B. 1.5 m/s C. 1.0 m/s D. 0.5 m/s
D. 0.5 m/s
500
What is Newton's Second Law of motion?
Force is equal to mass times acceleration.
500
Which forms of energy are produced by a light bulb? A. chemical energy and thermal energy B. light energy and thermal energy C. electrical energy and thermal energy D. chemical energy and light energy
B. light energy and thermal energy
500
What is chemical energy?
Chemical energy is energy that is stored in the bonds that hold atoms together in molecules.
500
Describe the movement of particles in a hot liquid.
The particles would be moving very quickly.
500
What is the law of conservation of mass?
Mass is conserved.