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Why are standard unit of measurement important to scientists
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Sci test
| Question | Answer |
|---|---|
| Why are standard unit of measurement important to scientists | |
| Units of measurement are the terms that we use to describe the size of something | |
| What are the SI unit that is used to measure mass length time and temperature | Seconds kilograms meters and Kelvin |
| If you ride your bicycle down a straight road for 500 M then turn around and ride back your distance is blank your displacement | Greater than |
| What is the device used to measure speed | Speedometer |
| The relationship among speed distance and time is | V equals D / t |
| A merry-go-round horse moves at a constant speed but changing | |
| Velocity | |
| Acceleration is a rate of change of | Velocity A equals V / t |
| A real car moving at 10 kilometers an hour has more momentum than a toy car moving at the same speed because a real car | More mass |
| In a graph showing temperature change of a material over time temperature change is the | Dependent variable |
| In the absence of an external force a moving object will | Move at a constant velocity |
| If you compare two objects with different masses which of the following must also be different | Weight |
| A student pushes a block so that it slides to the right what is the net force on it if the friction force is 3n and the applied force is a 5n | 2N |
| This quarterback just threw the football for a long pass name the forces acting on the ball as it moves through the air | Constant downward Force |
| A box sits at rest on a desk in the classroom what is the reaction force in the sense of Newton's third law to the weight of the box | The boxes upward pool on the Earth |
| The picture to the right shows two forces acting on a box which steps should you do first to figure out the net force | Use angle sin or cosine to find the components of 8n force |
| When you sit on the chair the resultant Force on you is | 0 |
| You are standing in a moving bus facing forward and you suddenly fall forward as a bus comes to an immediate stop what force causes you to move forward | Force due to friction between you and the floor of the bus |
| The acceleration of an object is inversely proportional to | Mass |
| An object of mass m sits on a flat table the Earth pull on this object with Force mg which we will call the action force what is the reaction force | The object pulling upward on the earth with mg |
| A golf club hits a golf ball with a force of 2400n and the golf ball hits the club with a force of | Equal force 2400n |
| An example of a force which acts at a distance is | Weight gravity static electricity |
| What is the mass of a person who weighs 110 | |
| 55 kg | |
| Solar energy is converted by plant in a process of photosynthesis into | Oxygen or chemical potential energy |
| SI unit for work done is | J or Joule |
| Energy is | The ability to do work |
| A bus travels with a constant force of 5000 n and work done by bus is 2500 J how much is the distance traveled by the bus | Divide work done by force and you get 0.5m |
| Power is defined as | The rate of energy transfer P equals W / t |
| An object of mass m raised to a height 2H above ground level possesses a gravitational potential energy of | 2 MGH |
| A pendulum Bob moves at a speed of 2 m s and mass of 0.5 kg its kinetic energy would be | 11 |
| Knocking a nail into a wooden block with a hammer involves conversion between different forms of energy write the correct order of forms of energy in this conversion | Chemical energy gravitational potential energy kinetic energy |
| Wind and waves are used by turbines to convert | Sound energy plus heat energy to kinetic energy to electrical energy |
| A ball of unknown mass is thrown Upward at a speed of 10 meters per second calculate maximum height reached by the ball if acceleration due to gravity is assumed to be 10 meters per second squared | 5 m |
| What form of energy is stored in the food we eat | Potential energy and chemical energy |
| When a pendulum Bob is this place to one side it gains | Gravitational potential energy and kinetic energy |
| A constant force on an object given by a product of force and distance move by object in direction of force is termed as | Work done |
| A car stopped switching to avoid a crash with a van what change is involved in kinetic energy | Kinetic energy is converted into sound and thermal energy |
| Formula for kinetic energy is | K equals 1/2 x MV |
| When Direction of applied force and direction in which objects move are perpendicular to each other what happened with work done | No work is done |
| GPS that tracks location is an abbreviation of | Global positioning system |
| Product of velocity and mass is called | Momentum |
| Name the wave that the direction of its wave is parallel to the distance of the vibration | Longitudinal |
| Electromagnetic waves Carry | A negative charge and also energy |
| Law stating that force is directly proportional to product of charges and inversely proportional to the square of separation between them is called | Coulomb's law |
| Formula that describes statement of Coulomb's law is | F equals k equals Q 1 x Q 2 / D Squared |
| When a person comes over here static electricity is sometimes generated by what process | The comb and hair transferred electrons or by induction |
| Which of the following is not an electrical classification of materials | Semi insulators which sometimes conduct and sometimes insulate |
| What type of forces act on a falling object | Gravity and air resistance |
| The universal law of gravitation was produced by | Newton |
| It is easier to roll a barrel then to pull it because | Rolling friction is much less than sliding friction |
| Define Ohm's law | The potential difference voltage across an ideal conductor is proportional to the current through it the constant of proportionality is called the resistance or Ohm's law is given by V equals I times r |
| What is the difference between series and parallel circuits | A series circuit has one path the currents are anywhere in the circuit the voltage is shared in a ratio to resistance resistance adds up. The brightness is less because P equals I times V. In a parallel circuit there are two or more pathways. Current adds |
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