$$6~\text{m/s}$$~\text{to the right}$

$$\text{distance}/\text{time}^4$$

Estimating the speed of a falling rock as $$v \sim 20~\text{mph}$$

Question 1

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

Accepted Answer

An object that can be represented as a mass at a single point in space.

Question 2

A car travels 60 miles at a constant speed. Convert this distance to kilometers using the conversion $$1~	ext{mi} = 1.609~	ext{km}.$$

Accepted Answer

$$96.64~	ext{km}$$

Question 3

Which of the following quantities is a vector?

Accepted Answer

Velocity

Question 4

A runner moves from $$x = 10~	ext{m} to$$ $$x = 40~	ext{m} in$$ $$5~	ext{s}. $$What is the average velocity?

Accepted Answer

$$6~	ext{m/s}$$~	ext{to the right}$

Question 5

Which of the following is NOT a basic SI unit?

Accepted Answer

Gram

Question 6

A ball is thrown straight up. At its highest point, what is true about its velocity and acceleration?

Accepted Answer

Velocity is zero, acceleration points down.

Question 7

The equation $$v = At^3$ - Bt$$ describes the speed $$v of an $$object. What are the dimensions of $$A$$?

Accepted Answer

$$	ext{distance}/	ext{time}^4$$

Question 8

A cyclist slows down from $$20~	ext{m/s} to $$rest in $$4~	ext{s}. $$What is the average acceleration?

Accepted Answer

$$-5~	ext{m/s}^2$$

Question 9

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros in a number with a decimal point are significant.

Question 10

A measurement is recorded as $$0.0520~	ext{m}. $$How many significant figures does it have?

Accepted Answer

3

Question 11

A car accelerates from rest at $$2.0~	ext{m/s}^2$$ for $$2.0~	ext{s}. $$How far does it travel?

Accepted Answer

$$8.0~	ext{m}$$

Question 12

Which of the following is a correct rule for dimensional analysis?

Accepted Answer

Quantities can be added or subtracted only if they have the same dimensions.

Question 13

A position-versus-time graph for a moving object is a straight line with a positive slope. What does this indicate?

Accepted Answer

The object is moving at a constant positive velocity.

Question 14

Which of the following is the best estimate for the mass of a car?

Accepted Answer

$$1000~	ext{kg}$$

Question 15

A student walks from the dorms to the cafeteria, then from the cafeteria to the science building. What is the resultant displacement?

Accepted Answer

The vector sum of the two individual displacements.

Question 16

Which of the following is true about average speed and average velocity?

Accepted Answer

Average speed is a scalar, while average velocity is a vector.

Question 17

A vibrating system is described by $$y(x,t) = A_0$ e$$^{-\alpha t}$$ \sin(kx - \omega t). $$What are the SI units of $$k$$?

Accepted Answer

$$1/	ext{m}$$

Question 18

Which of the following is an example of an order-of-magnitude estimate?

Accepted Answer

Estimating the speed of a falling rock as $$v \sim 20~	ext{mph}$$

Question 19

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

Accepted Answer

Guess the answer based on intuition.

Chapter 1: Concepts of Motion – Physics with Calculus Study Notes

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