Question

physics worksheet - 1.3 section review
name: __________ date: ________ class: __________
objective
review and apply concepts of speed, problem - solving steps in physics, and motion calculations.
part a: conceptual questions

1. list three commonly used units for speed.
2. state the steps used to solve physics problems.

part b: practice problems

1. calculate the average speed (in km/h) of a car that drives 140 kilometers hours.

show your work:
answer: ____________ km/h

Explanation:

1.

Common speed - units include meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph). They are used in different contexts depending on the region and application.

Typical steps to solve physics problems are: identify the known and unknown quantities, choose the relevant physical principles or equations, substitute values into the equations, and solve for the unknown.

Step1: Recall the speed formula

The formula for average speed is $v=\frac{d}{t}$, where $v$ is average speed, $d$ is distance, and $t$ is time.

Step2: Identify given values

Given $d = 140$ km. But the time value is missing in the problem statement. Assuming the time $t = 2$ hours (since it's not given in the provided text, we need a value to calculate. If it was given, we'd use that). Then $v=\frac{140}{2}$.

Step3: Calculate the speed

$v = 70$ km/h

Answer:

m/s, km/h, mph
2.