Question 1

Which of the following best describes the difference between translational and rotational motion?

Accepted Answer

Translational motion involves an object moving through space, while rotational motion involves an object rotating about an axis without changing its position.

Question 2

A car travels 120 meters in 10 seconds. What is its average speed?

Accepted Answer

$$\displaystyle 12\ \mathrm{m/s}$$

Question 3

Which of the following quantities is a vector?

Accepted Answer

Velocity

Question 4

A runner moves from position $$(x_1$, y_1$) = (2, 3) m to$$ $$(x_2$, y_2$) = (7, 11) m. $$What is the displacement vector $$\Delta \vec{r}$$?

Accepted Answer

$$\displaystyle (5, 8)\ \mathrm{m}$$

Question 5

If a car’s velocity changes from $$10\ \mathrm{m/s}$$ east to $$-5\ \mathrm{m/s}$$ east in $$3\ \mathrm{s}$$, what is its average acceleration?

Accepted Answer

$$\displaystyle \frac{-5 - 10}{3} = -5\ \mathrm{m/s^2$}$$

Question 6

Which of the following statements about significant figures is correct?

Accepted Answer

The number of significant figures in a product or quotient is determined by the value with the least number of significant figures.

Question 7

A ball is thrown and follows a parabolic path. Which type of motion is this?

Accepted Answer

Projectile motion

Question 8

A position vs. time graph shows a straight line with a positive slope. What does this indicate about the object’s motion?

Accepted Answer

The object is moving with constant velocity.

Question 9

Which SI unit is correctly matched with its physical quantity?

Accepted Answer

Kilogram – mass

Question 10

A student walks 100 m east, then 100 m west in 50 s. What is the magnitude of her average velocity?

Accepted Answer

$$\displaystyle 0\ \mathrm{m/s}$$

Question 11

Which prefix represents $$10^{-6}$$?

Accepted Answer

micro-

Question 12

A cyclist travels at $$36\ \mathrm{km/h}. $$What is this speed in $$\mathrm{m/s}$$?

Accepted Answer

$$\displaystyle 10\ \mathrm{m/s}$$

Question 13

Which of the following is a derived SI unit?

Accepted Answer

Newton (N)

Question 14

A position vector $$\vec{r}_3$$ has a magnitude of $$21\ \mathrm{m} at$$ $$45^\circ$$ from the x-axis. What are its x and y components?

Accepted Answer

$$\displaystyle (14.8, 14.8)\ \mathrm{m}$$

Question 15

If an object’s velocity and acceleration vectors point in the same direction, what happens to the object?

Accepted Answer

It speeds up.

Question 16

A measurement is recorded as $$0.00620. $$How many significant figures does it have?

Accepted Answer

3

Question 17

A car travels 2.00 ft. Convert this distance to centimeters. (1 ft = 12 in, 1 in = 2.54 cm)

Accepted Answer

$$\displaystyle 61.0\ \mathrm{cm}$$

Question 18

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

Accepted Answer

Treating an object as if all its mass is concentrated at a single point.

Question 19

A car’s position is given by $$x(t) = 5t^2$ meters. What is the car’s velocity at t = 2$ s?

Accepted Answer

$$\displaystyle 20\ \mathrm{m/s}$$

Question 20

A mass of $$6.47\ \mathrm{kg} is $$combined with a piece of aluminum of volume $$4.44 	imes 10$$^{-4}$$\ \mathrm{m}^3$$ and density $$2.7 	imes 10^3$\ \mathrm{kg/m}^3. $$What is the total mass, using correct significant figures?

Accepted Answer

$$\displaystyle 7.7\ \mathrm{kg}$$

Concepts of Motion: Foundations for Physics

Guida di studio - Domande di pratica

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