Sarah has hypothesized that her peers use Web-bsed materials much more frequently than text books to support
learning in science. She is conducting research on how other students use Web-based search engines to
supplement content knowledge and material while taking science classes in high school. She is going to use a
variety of methods to collect data.
While conducting a scientific investigation Sarah may collect evidence and data through direct or indirect
observations. All BUT ONE technique is an example of direct observation. That is
A)
Video record students using the computers in the student lab.
Interviewing students about their computer use during and after school.
Checking student computer records to see how many students used Web-
based search engines.
Sitting next to students while using the computer lab in school and
recording the sites they visit.

seeing the graph would

a. are

so easy. just google the electromagnetic waves and it’ll pop up.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.