Question 1

A student walks from their house to a grocery store 4.3 km east, then to a friend's house 2.1 km west of the grocery store. What is the student's total displacement from their house to their friend's house?

Accepted Answer

$$2.1\ \mathrm{km}$$\ west

Question 2

Which of the following statements about displacement and distance is correct?

Accepted Answer

Displacement is a vector, while distance is a scalar.

Question 3

A car travels 330 km west from St. John's to Gander and back in 6.0 hours. What is the average velocity for the entire round trip?

Accepted Answer

$$0\ \mathrm{km/h}$$

Question 4

A runner moves from $$x_i = 2.0\ \mathrm{m} to$$ $$x_f = -7.0\ \mathrm{m}. $$What is the runner's displacement and total distance travelled?

Accepted Answer

Displacement: $$-9.0\ \mathrm{m}$$, Distance: $$9.0\ \mathrm{m}$$

Question 5

Which equation correctly defines average velocity?

Accepted Answer

$$v_{av} = \frac{\Delta x}{\Delta t}$$

Question 6

A car drives 4 miles at $$30\ \mathrm{mi/h}$$ and then 4 miles at $$50\ \mathrm{mi/h}. $$What is the average speed for the entire 8-mile trip?

Accepted Answer

$$37.5\ \mathrm{mi/h}$$

Question 7

On a position vs. time graph, what does the slope of the tangent line at a point represent?

Accepted Answer

The instantaneous velocity at that time

Question 8

A ball is thrown vertically upward. At the top of its trajectory, what are its velocity and acceleration?

Accepted Answer

$$v = 0$$, $$a = g$$\ downward

Question 9

Which of the following is true for an object in free fall near Earth's surface (ignoring air resistance)?

Accepted Answer

All objects fall with the same constant acceleration $$g$$

Question 10

A Tesla Model S accelerates from rest to $$101\ \mathrm{km/h} in$$ $$2.7\ \mathrm{s}. $$What is its average acceleration in $$\mathrm{m/s^2$}$$?

Accepted Answer

$$10.4\ \mathrm{m/s^2$}$$

Question 11

Which kinematic equation is used to find the final velocity of an object under constant acceleration?

Accepted Answer

$$v = v_0$ + at$$

Question 12

A stone is thrown vertically downward from a building with an initial speed of $$15.0\ \mathrm{m/s}. $$What is its speed after $$2.0\ \mathrm{s}$$? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$34.6\ \mathrm{m/s}$$

Question 13

Which of the following best describes the area under a velocity vs. time graph?

Accepted Answer

It represents the object's displacement

Question 14

A police motorcycle accelerates from rest at $$2.5\ \mathrm{m/s^2$} in $$pursuit of a car moving at $$122\ \mathrm{km/h}. If $$the car is initially $$110\ \mathrm{m}$$ ahead, how long does it take for the motorcycle to catch up?

Accepted Answer

$$17.8\ \mathrm{s}$$

Question 15

If the acceleration of a car is not constant, how can its velocity at a given time be determined from an acceleration vs. time graph?

Accepted Answer

By integrating the acceleration over time

Question 16

Which of the following is the correct dimensional formula for acceleration?

Accepted Answer

$$\mathrm{L/T^2$}$$

Question 17

A ball and a 100-kg ball are dropped from a height of 4 m at the same time (ignoring air resistance). What happens?

Accepted Answer

The two balls hit the ground at the same time.

Question 18

Which kinematic equation would you use to find the distance travelled by an object under constant acceleration, given initial velocity, time, and acceleration?

Accepted Answer

$$x = x_0$ + v_0$ t + \frac{1}{2} a t^2$

Question 19

A Boeing 737 lands at $$69.4\ \mathrm{m/s}$$ and comes to a stop in $$1800\ \mathrm{m}. $$What is its acceleration?

Accepted Answer

$$-1.34\ \mathrm{m/s^2$}$$

Chapter 2 – Motion Along a Straight Line (1D Kinematics): Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard