Question 1

Which of the following is NOT a component of a pictorial representation in physics problem-solving?

Accepted Answer

A detailed written essay

Question 2

A skier glides along smooth, horizontal snow at constant speed, then speeds up going down a hill. Which statement best describes the skier’s acceleration during the downhill motion?

Accepted Answer

The acceleration vector points in the same direction as the velocity vector.

Question 3

If an object’s velocity is constant, what can be said about its acceleration?

Accepted Answer

Acceleration is zero.

Question 4

A ball is tossed straight up in the air. At its very highest point, what is the direction of the acceleration vector?

Accepted Answer

Points down

Question 5

In a motion diagram, if an object is slowing down but moving to the right, what is the relationship between the velocity and acceleration vectors?

Accepted Answer

Velocity points right, acceleration points left.

Question 6

Which equation correctly represents the rate of change of the velocity vector?

Accepted Answer

$$a = \frac{\Delta v}{\Delta t}$$

Question 7

A student walks to school and her position-versus-time graph shows a straight line with a positive slope. What does this indicate about her motion?

Accepted Answer

She is moving at constant speed.

Question 8

Which step is NOT part of the general problem-solving strategy in physics?

Accepted Answer

Guess the answer without analysis

Question 9

When multiplying or dividing several numbers, how should the number of significant figures in the answer be determined?

Accepted Answer

By the number with the least significant figures

Question 10

Given the numbers: 8200, 0.0052, 0.430, and $$4.321 	imes 10$$^{-10}$$, which has the most significant figures?

Accepted Answer

$$4.321 	imes 10$$^{-10}$$

Question 11

A weather rocket is launched vertically with an acceleration of $$30\ 	ext{m/s}^2$$ for $$30\ 	ext{s}$$, then runs out of fuel. What is the rocket’s velocity at the moment it runs out of fuel?

Accepted Answer

$$v = 900\ 	ext{m/s}$$

Question 12

Which of the following best describes the particle model in physics?

Accepted Answer

It represents a moving object as if all its mass were concentrated at a single point.

Question 13

If a car’s position-versus-time graph is a horizontal line, what does this indicate about the car’s motion?

Accepted Answer

The car is stationary.

Question 14

Which of the following statements about acceleration is correct?

Accepted Answer

Acceleration is the rate of change of the velocity vector.

Question 15

A ball is thrown upward and reaches its maximum height. What is true about its velocity and acceleration at the top?

Accepted Answer

Velocity is zero, acceleration points downward.

Question 16

Which of the following is NOT a reason to use a pictorial representation when solving physics problems?

Accepted Answer

It guarantees the answer without calculation.

Question 17

In a position-versus-time graph, what does the slope of the line represent?

Accepted Answer

Velocity

Question 18

When adding or subtracting numbers, how should the number of decimal places in the answer be determined?

Accepted Answer

By the number with the smallest number of decimal places

Question 19

Which of the following is a correct step in drawing a pictorial representation?

Accepted Answer

Draw a motion diagram

Question 20

A car moves along a straight road and its position graph shows a sharp change in slope. What does this indicate?

Accepted Answer

The car is accelerating.

Concepts of Motion and Problem-Solving in Physics

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