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stience
| Question | Answer |
|---|---|
| Speed equals distance divided by | time |
| When you know both the speed and direction of an object's motion, you know the | instantaneous speed of the object. |
| The steepness of a line on a graph is called the | rise |
| In a speed-versus-time graph, a straight line shows that acceleration is | constant |
| Which of the following is the SI unit of acceleration? | B |
| On a graph showing distance-versus-time, a horizontal line represents an object that is | not moving at all |
| The International System of Units is used by scientists | all over the world |
| An object changing direction is an example of | acceleration |
| Which of these is an example of deceleration? | car approaching a red light |
| If you know a car traveled 300 km in 3 hours, you can find its | average speed |
| Suppose you are sitting in a car at a red light when a car moving toward the north begins to pass you. If you use the passing car as a reference point, the direction in which you appear to be moving is toward the _. | south |
| The basic SI unit of length is the _. | meter |
| A golf ball _ when either its speed or direction changes | accelerate |
| If a car is speeding up, its initial speed is _ than its final speed. | less than its final speed. |
| If two lines appear on the same motion graph, the line with the steeper _ indicates a greater speed. | slope indicates a greater |
| If a toy car traveling at 10 cm/s passes a toy car moving at 10 cm/s in the opposite direction, both cars have the same velocity. | false |
| Motion is measured relative to a reference point. | true |
| Average speed is the rate at which an object is moving at a given instant. | false |
| An SI unit of velocity is the meter per second per second. | false |
| A straight diagonal line on a distance-versus-time graph indicates constant speed. | true |
| What happens when two forces act in the same direction? | Their strengths are added |
| The greater the mass of an object, | the greater its inertia. |
| The force that one surface exerts on another when the two rub against each other is called | friction. |
| The force of gravity on a person or object on the surface of a planet is called | . weight. |
| Forces can be added together only if they are | acting on the same object |
| Buoyant force acts in the opposite direction as the force of | gravity |
| Gravity will pull a pencil down with the same force as a feather with the same mass. This is an example of | Newton's Second Law of Motion. |
| When placed in a bowl of oil with a density of 0.95 g/cm3, an unknown material with a density of 0.90 g/cm3 will | float. |
| According to Newton's Third Law of Motion, when a hammer strikes and exerts force on a nail, the nail | exerts an equal and opposite force on the hammer. |
| If you drop a sheet of paper horizontal to the floor and a crumpled ball of paper at the same time from the same height in your classroom, the crumpled ball of paper will hit the floor first because | air friction has a greater effect on the sheet of paper dropped horizontally. |
| An object that orbits another object in space is called a(n) | satellite. |
| How can you increase the momentum of an object? | by increasing its mass |
| One _ is the force required to accelerate 1 kilogram of mass at 1 meter per second per second | Newton |
| The overall force on an object after all the forces are added together is called the _ force. | net |
| The force of gravity between you and Earth is greater than the force of gravity between you and a car because Earth has more _ than the car. | mass |
| According to Newton's Third Law of Motion, the strength of a reaction force is _ the strength of the action force. | equal to |
| The force of gravity is responsible for continuously changing the _ in which a satellite moves. | direction |
| When the only force acting on a falling object is air resistance, the object is said to be in free fall. | false |
| The property of matter that resists a change in motion is called inertia | true |
| To calculate the density of an object, you multiply mass by volume. | false |
| Friction depends on the types of surfaces involved and how hard the surfaces push together. | true |
| The theory of gravity describes the attraction between all objects in the universe. | false |
| The ability to do work or cause change is called | energy |
| Energy is measured in units called | joules |
| What type of energy does a spinning turbine have? | mechanical energy |
| An example of something that stores chemical energy is | a match. |
| What type of energy transformation is taking place when natural gas is used to heat water? | chemical energy into thermal energy |
| Which of the following has kinetic energy? | a rolling bowling ball |
| gravitational potential energy. | gravitational potential energy. |
| The rate at which energy is transferred is called | power. |
| How would you calculate an object's mechanical energy? | Add its kinetic and potential energies. |
| Energy stored in the nucleus of an atom is called | nuclear energy. |
| A large truck and a samll car are moving at the same speed. The truck has greater kinetic energy because its _ is greate | mass |
| If the velocity of an object is doubled, its kinetic energy is multiplied by _. | four. |
| To maintain your body temperature, your body converts chemical potential energy into _ energy. | thermal |
| As water runs over a waterfall, its potential energy is converted into _ energy. | kinetic |
| The law of _ states that energy cannot be created or destroyed. | conservation of energy |
| When work is done on an object, the object gains energy. | true |
| he kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf. | false |
| A compressed spring has elastic potential energy. | true |
| In a machine, work output is less than work input because some energy is converted into thermal energy. | true |
| A nuclear reaction in which the nuclei of atoms join together is called nuclear fission. | false |
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