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Interim Q3 Review
| Question | Answer |
|---|---|
| Describe Newton's First Law of Motion | an object at rest remains at rest; and an object in motion remains in motion at a constant speed; unless an unbalanced force is applied. |
| Describe Newton's Second Law of Motion | the acceleration of an object depends on the mass of he object and the amount of the force applied |
| Describe Newton'sThird Law of Motion | For every exerted force, there is an equal and opposite force |
| Describe Newton's Law of Universal Gravitation | Gravitational force between 2 objects increases as masses increase or distance between the 2 objects decreases |
| Define gravity | a force of attraction between objects due to the masses of the object |
| Calculate the force of a 10kg object accelerated at 9.8m/s2 | 98N |
| Define force and how is it measured (unit) | push or a pull, unit is Newton |
| Define net force | combination of all forces acting on an object |
| Define Inertia | the tendency to stay still or in constant motion, NOT a force |
| Calculate the force of a 100kg object accelerated at 5m/s2 | 500N |
| Calculate the mass of an object accelerated at 9.8m/s2 using an applied force of 1000N | 102kg |
| Calculate the acceleration of a 10kg object that has a 500N force applied to it | 50 m/s2 |
| Calculate the net force of an object that has an applied force to the left of 12N and an applied force to the right of 16N. | 4N right |
| Calculate the net force of an object that has a downward force of 10N, an upward lift of 8N, an applied force to the left of 5N, and an applied force to the right of 5N. | 2N down |
| Explain the net forces of a book at rest on the table. | 0N left or right, balanced up and downward forces. |
| Explain the net forces of a pushed book sliding down an incline to the left. | Balanced forces up and down, frictional forces to the right are overcome by applied forces to the left. |
| As wavelength increases, frequency ______ | decreases |
| As frequency increases, wavelength ___________ | decreases |
| Reflected sound is called an) _____ | echo |
| Define refraction | the bending of a wave as the wave passes between 2 substances in which the speed of the wave varies |
| Light is dispersed- spread out, into separate colors when using a prism. This is an example of ______ | refraction |
| Define diffraction | a change in the direction of a wave when the wave finds an obstacle or an edge, such as an opening |
| If the barrier is larger than the wavelength, there is _____ of diffraction | a small amount |
| If the barrier is smaller than the wavelength, there is ____ of diffraction | a large amount |
| Define constructive interference | when crests and troughs overlap to create a larger amplitude wave |
| Define destructive interference | when the crest of one wave and the trough of another wave overlap and create a decreased amplitude wave |
| Define wave speed and what has the most influence on wave speed | the speed at which a wave travels through a medium/ the make up of the media |
| Determine the wave speed of a wave that has a wavelength of 5m and a frequency of 4 Hz. | 20 m/s |
| Which visible light color has the longest wavelength and the lowest energy? | Red |
| Which color has the shortest wavelength and the highest energy? | Violet |
| Explain critical angle and its relationship to reflection and refraction | PAST the point of the critical angle, light will no longer be refracted, but all light will be internally reflected |
| Doppler Effect- to a person standing in front of an approaching vehicle with a siren, how does the sound sound in terms of frequency and pitch? Why? | To a person in front of the vehicle, the frequency and pitch of the sound seem high. Waves are being compressed- shorter wavelength means higher frequency |
| Sound typically travels fastest in solids, followed by liquids, followed by air. Why does this make sense? | sound needs a medium to travel through and solids are most compact |
| Temperature- generally, cooler the material, slower the sound travels. Why does this make sense? | particles are vibrating more slowly in colder temperatures |
| What is the average acceleration of a subway train that speeds up from 9.6 m/s to 12 m/s in .8s on a straight section of track? | average acceleration = 3 m/s2 |
| What is the acceleration of a 3kg mass object if a force of 14.4 N is applied? | a= 4.8 m/s2 |
| What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s2? | F= m x a= 50,000N |
Created by:
suzannewilliams
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