Question 1

Which of the following best describes translational motion?

Accepted Answer

An object moves from one point to another in space, following a trajectory that can be linear, parabolic, or circular.

Question 2

A motion diagram is created by layering frames from a video of a moving object. What does the spacing between the images in a motion diagram indicate?

Accepted Answer

The speed of the object; equally spaced images indicate constant speed.

Question 3

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 4

A car travels 100 meters east in 5 seconds, then 100 meters west in 5 seconds. What is the car's average velocity over the 10 seconds?

Accepted Answer

$$\frac{0\ \mathrm{m}}{10\ \mathrm{s}} = 0\ \mathrm{m/s}$$

Question 5

Which equation correctly defines average acceleration?

Accepted Answer

$$a_{avg} = \frac{v_f - v_i}{\Delta t}$$

Question 6

A cyclist moves with constant velocity. What does the motion diagram of the cyclist look like?

Accepted Answer

The images are equally spaced apart.

Question 7

If a vector $$\vec{A}$$ points east and vector $$\vec{B}$$ points north, what is the direction of the resultant vector $$\vec{A} + \vec{B}$$?

Accepted Answer

Northeast

Question 8

A student walks 3.0 km east, then 4.0 km north. What is the magnitude of the displacement vector?

Accepted Answer

$$5.0\ \mathrm{km}$$

Question 9

Which of the following statements about significant figures is correct?

Accepted Answer

When adding or subtracting, the answer should have as many decimal places as the number with the fewest decimal places.

Question 10

A runner travels 400 meters in 50 seconds. What is her average speed?

Accepted Answer

$$8.0\ \mathrm{m/s}$$

Question 11

Which SI unit is used to measure mass?

Accepted Answer

Kilogram (kg)

Question 12

A car accelerates from $$10\ \mathrm{m/s} to$$ $$30\ \mathrm{m/s} in$$ $$4.0\ \mathrm{s}. $$What is its average acceleration?

Accepted Answer

$$5.0\ \mathrm{m/s^2$}$$

Question 13

Which of the following is NOT a fundamental SI unit?

Accepted Answer

Newton (N)

Question 14

A measurement is recorded as $$0.00620 m. $$How many significant figures does this value have?

Accepted Answer

3

Question 15

A block has a mass of $$2.7\ \mathrm{kg}$$ and a volume of $$0.00444\ \mathrm{m^3$}. $$What is its density?

Accepted Answer

$$607\ \mathrm{kg/m^3$}$$

Question 16

Which of the following best describes the difference between a scalar and a vector quantity?

Accepted Answer

A vector has magnitude and direction, while a scalar has only magnitude.

Question 17

A student converts $$2.00\ \mathrm{ft} to $$centimeters using the conversion $$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$ and $$1\ \mathrm{ft} = 12\ \mathrm{in}. $$What is the correct value in centimeters?

Accepted Answer

$$60.96\ \mathrm{cm}$$

Question 18

Which of the following is true about scientific notation and significant figures?

Accepted Answer

Scientific notation helps clearly state the number of significant figures in a measurement.

Question 19

A car's position is given by $$x(t) = 5t^2$ meters, where t$ is in seconds. What is the car's instantaneous velocity at t = 3$ s?

Accepted Answer

$$30\ \mathrm{m/s}$$

Fundamental Concepts of Motion in Physics

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