Question 1

A person walks from $$x = -2\ \mathrm{m} to$$ $$x = 3\ \mathrm{m}$$ along a straight line. What is the person's displacement?

Accepted Answer

$$5\ \mathrm{m}$$

Question 2

A car travels 4.0 mi east, then 3.0 mi west. What is the total distance traveled and the displacement?

Accepted Answer

Distance: $$7.0\ \mathrm{mi}$$, Displacement: $$1.0\ \mathrm{mi}$$ east

Question 3

A runner sprints 100 m in 10 s, then walks back to the starting point in 50 s. What is the average velocity for the entire trip?

Accepted Answer

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

Question 4

The position of a particle is given by $$x = 4 - 12t + 3t^2$ (with x$ in meters and t$ in seconds). What is the instantaneous velocity at t = 2$$\ \mathrm{s}$$?

Accepted Answer

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

Question 5

A car accelerates from rest at $$3.0\ \mathrm{m/s^2$}$$ for $$4.0\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

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

Question 6

A ball is thrown straight up with an initial velocity of $$10\ \mathrm{m/s}. $$How long does it take to reach its maximum height? (Assume $$g = 9.81\ \mathrm{m/s^2$})$$

Accepted Answer

$$1.02\ \mathrm{s}$$

Question 7

A 2.0 kg object is dropped from rest from a height of 5.0 m. What is its speed just before hitting the ground? (Ignore air resistance, $$g = 9.81\ \mathrm{m/s^2$})$$

Accepted Answer

$$9.9\ \mathrm{m/s}$$

Question 8

A projectile is launched at $$20\ \mathrm{m/s} at an $$angle of $$30^\circ$$ above the horizontal. What is the maximum height reached? (Use $$g = 9.81\ \mathrm{m/s^2$})$$

Accepted Answer

$$5.1\ \mathrm{m}$$

Question 9

A vector has components $$A_x = 3$$ and $$A_y = 4. $$What is its magnitude?

Accepted Answer

$$5$$

Question 10

A $$10\ \mathrm{kg}$$ box is pulled across a horizontal surface with a force of $$50\ \mathrm{N} at an $$angle of $$30^\circ$$ above the horizontal. If the coefficient of kinetic friction is $$0.2$$, what is the magnitude of the frictional force?

Accepted Answer

$$19.6\ \mathrm{N}$$

Question 11

A $$5.0\ \mathrm{kg}$$ object is suspended from a rope in an elevator accelerating upward at $$2.0\ \mathrm{m/s^2$}. $$What is the tension in the rope? ($$g = 9.81\ \mathrm{m/s^2$})$$

Accepted Answer

$$59.1\ \mathrm{N}$$

Question 12

A $$0.2\ \mathrm{kg}$$ ball moves in a circle of radius $$0.5\ \mathrm{m} at a $$speed of $$2.0\ \mathrm{m/s}. $$What is the magnitude of the centripetal force?

Accepted Answer

$$1.6\ \mathrm{N}$$

Question 13

A $$3.0\ \mathrm{kg}$$ block is at rest on a horizontal surface. The coefficient of static friction is $$0.4. $$What is the minimum force required to start moving the block?

Accepted Answer

$$11.8\ \mathrm{N}$$

Question 14

A $$2.0\ \mathrm{kg}$$ object is moving at $$5.0\ \mathrm{m/s}$$ and comes to rest in $$4.0\ \mathrm{s}$$ due to a constant friction force. What is the magnitude of the friction force?

Accepted Answer

$$2.5\ \mathrm{N}$$

Question 15

A $$1.5\ \mathrm{kg}$$ object is attached to a string and swung in a horizontal circle of radius $$2.0\ \mathrm{m} at a $$speed of $$4.0\ \mathrm{m/s}. $$What is the tension in the string?

Accepted Answer

$$12\ \mathrm{N}$$

Question 16

A $$10\ \mathrm{kg}$$ box is at rest on a rough surface. The coefficient of static friction is $$0.5$$ and the coefficient of kinetic friction is $$0.3. A $$horizontal force of $$40\ \mathrm{N} is $$applied. What happens?

Accepted Answer

The box does not move.

Question 17

A $$2.0\ \mathrm{kg}$$ block slides down a frictionless incline of $$30^\circ. $$What is its acceleration?

Accepted Answer

$$4.9\ \mathrm{m/s^2$}$$

Question 18

A $$0.5\ \mathrm{kg}$$ ball is thrown horizontally from a $$10\ \mathrm{m}$$ high cliff. How long does it take to hit the ground? ($$g = 9.81\ \mathrm{m/s^2$})$$

Accepted Answer

$$1.43\ \mathrm{s}$$

Question 19

A $$1.0\ \mathrm{kg}$$ object is acted on by two forces: $$F_1 = 3$$\ \mathrm{N}$$ east and F_2$ = 4\ \mathrm{N}$$ north. What is the magnitude of the net force?

Accepted Answer

$$5\ \mathrm{N}$$

Chapter 2: Motion Along a Straight Line – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드