Question

During an experiment, a toy car accelerates forward for a total time of 5 s. Which of the following procedures could a student use to determine the average net force exerted on the car during the 5 s that the car accelerates? a. Use a meterstick and stopwatch to measure the distance the car travels for the 5 s. b. Use a balance to determine the mass of the car. Use a motion sensor to measure the speed of the car at a time of 0 s and a time of 5 s.c. Use a balance to determine the mass of the car. Use a meterstick to measure the distance the car travels for the 5 s. d. Use a motion sensor to measure the speed of the car at a time of 0 s and a time of 5 s. Use a meterstick to determine the distance the car travels for 5 s.

Answer 1

Answer:

b)

Explanation:

According Newton's 2nd Law, the net force on an object (assuming we can consider it like a point mass), produces an acceleration on the mass of the object, expressed in this way:

Fnet = m*a (1)

By definition, the acceleration is the rate of change of velocity:

$a =\frac{(vf-vo)}{t-to}$

If we choose t₀ = 0, we can see that if we measure vf and v₀, as time is known, we can get the value of a.

Using a balance to determine the mass of the car, and replacing all the values in (1), we can get the magnitude of the net force exerted on the car during the 5 s that the car accelerates, as required.

Answer 2

Answer:

What speed is the car traveling at the longest distance and the shortest distance, and how do they compare?"

"Does the car move faster or slower for longer distances?"