Question 1

A car moves along a straight road and its position as a function of time is given by the equation $$x(t) = 4t + 2$$, where $$x is in $$meters and $$t is in $$seconds. What is the velocity of the car?

Accepted Answer

$$4\ \mathrm{m/s}$$

Question 2

A student walks to school and her position is recorded every minute. If her position-versus-time graph is a straight line with a positive slope, what does this indicate about her motion?

Accepted Answer

She is moving at a constant velocity in the positive direction.

Question 3

A train travels 12 km in 10 minutes at a constant speed. How long will it take to travel 60 km at the same speed?

Accepted Answer

$$50\ \mathrm{min}$$

Question 4

The area under a velocity-versus-time graph represents which physical quantity?

Accepted Answer

Displacement

Question 5

A car accelerates from rest at $$3\ \mathrm{m/s^2$}$$ for $$4\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

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

Question 6

A ball is thrown straight up with an initial velocity of $$15\ \mathrm{m/s}. $$What is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$11.5\ \mathrm{m}$$

Question 7

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

Accepted Answer

The acceleration is always $$9.8\ \mathrm{m/s^2$}$$ downward.

Question 8

A car traveling at $$15\ \mathrm{m/s}$$ comes to a stop in $$1.5\ \mathrm{s}$$ with constant acceleration. What is the magnitude of its acceleration?

Accepted Answer

$$10\ \mathrm{m/s^2$}$$

Question 9

A velocity-versus-time graph for an object moving with constant acceleration is:

Accepted Answer

A straight line

Question 10

A Boeing 747 accelerates at $$2.6\ \mathrm{m/s^2$}$$ from rest to a takeoff speed of $$70\ \mathrm{m/s}. $$What is the minimum runway length required for takeoff?

Accepted Answer

$$940\ \mathrm{m}$$

Question 11

A rock is dropped from rest from a height of $$100\ \mathrm{m}. $$How long does it take to reach the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.52\ \mathrm{s}$$

Question 12

Which of the following best describes the meaning of instantaneous velocity?

Accepted Answer

The velocity of an object at a specific instant of time.

Question 13

A lion accelerates from rest at $$9.5\ \mathrm{m/s^2$}$$ and reaches a speed of $$4.5\ \mathrm{m/s}. $$How much time does it take?

Accepted Answer

$$0.47\ \mathrm{s}$$

Question 14

If the position-versus-time graph of an object is a parabola opening upwards, what does this indicate about the object's motion?

Accepted Answer

The object is moving with constant acceleration.

Question 15

A car moves with a velocity of $$20\ \mathrm{m/s}$$ and slows down to $$0\ \mathrm{m/s} in$$ $$4\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

$$-5\ \mathrm{m/s^2$}$$

Question 16

A ball is thrown downward from a tower with an initial velocity of $$3.0\ \mathrm{m/s}. $$What is its velocity after $$2.0\ \mathrm{s}$$? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$22.6\ \mathrm{m/s}$$

Question 17

Which of the following is NOT a step in the recommended problem-solving approach for one-dimensional motion problems?

Accepted Answer

Guess the answer based on intuition.

Question 18

A springbok jumps straight up with a speed of $$7.0\ \mathrm{m/s}. $$What is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.5\ \mathrm{m}$$

Question 19

A car travels at $$14\ \mathrm{m/s}$$ and the driver's reaction time is $$0.5\ \mathrm{s}. $$How far does the car travel during the reaction time before the brakes are applied?

Accepted Answer

$$7\ \mathrm{m}$$

Ch 2 Motion in One Dimension: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard