Question 1

A ball is thrown vertically upward with an initial velocity of 25 m/s. Neglecting air resistance, what is the total time the ball spends in the air before returning to the thrower's hand? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$5.1\ \mathrm{s}$$

Question 2

A car accelerates uniformly from rest to a speed of $$30\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the magnitude of its acceleration?

Accepted Answer

$$3.0\ \mathrm{m/s^2$}$$

Question 3

A projectile is launched at $$20\ \mathrm{m/s} at an $$angle of $$45^\circ$$ above the horizontal. What is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$10.2\ \mathrm{m}$$

Question 4

A 70-kg person stands in an elevator that is accelerating upward at $$2.0\ \mathrm{m/s^2$}. $$What is the normal force exerted by the floor on the person?

Accepted Answer

$$840\ \mathrm{N}$$

Question 5

A block of mass $$10\ \mathrm{kg} is $$pulled across a horizontal surface with a force of $$50\ \mathrm{N}. $$The coefficient of kinetic friction between the block and the surface is $$0.3. $$What is the acceleration of the block? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$1.5\ \mathrm{m/s^2$}$$

Question 6

A cyclist travels $$40\ \mathrm{km}$$ east, then $$30\ \mathrm{km}$$ north. What is the magnitude of the cyclist's displacement from the starting point?

Accepted Answer

$$50\ \mathrm{km}$$

Question 7

A $$2.0\ \mathrm{kg}$$ object is acted on by a net force of $$10\ \mathrm{N} at an $$angle of $$60^\circ$$ above the horizontal. What is the horizontal component of the object's acceleration?

Accepted Answer

$$4.3\ \mathrm{m/s^2$}$$

Question 8

A $$5.0\ \mathrm{kg}$$ box is at rest on a horizontal surface. The coefficient of static friction is $$0.4. $$What is the minimum horizontal force required to start moving the box? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$19.6\ \mathrm{N}$$

Question 9

A $$1.5\ \mathrm{kg}$$ ball is dropped from rest from a height of $$20\ \mathrm{m}. $$What is its speed just before hitting the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$19.8\ \mathrm{m/s}$$

Question 10

A $$10\ \mathrm{kg}$$ crate is pulled up a $$30^\circ$$ incline with a force parallel to the incline. If the coefficient of kinetic friction is $$0.2$$, what is the minimum force required to move the crate up at constant speed? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$78\ \mathrm{N}$$

Question 11

A $$2.0\ \mathrm{kg}$$ object moves in a circle of radius $$4.0\ \mathrm{m} at a $$constant speed of $$6.0\ \mathrm{m/s}. $$What is the magnitude of the net force acting on the object?

Accepted Answer

$$9.0\ \mathrm{N}$$

Question 12

A $$1.0\ \mathrm{kg}$$ ball is attached to a string and swung in a vertical circle of radius $$2.0\ \mathrm{m}. $$What is the minimum speed at the top of the circle so that the string remains taut? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.4\ \mathrm{m/s}$$

Question 13

A $$1200\ \mathrm{kg}$$ car moving at $$25\ \mathrm{m/s}$$ comes to a stop in $$100\ \mathrm{m}$$ due to braking. What is the magnitude of the average braking force?

Accepted Answer

$$3750\ \mathrm{N}$$

Question 14

A $$10\ \mathrm{kg}$$ box is pushed across a horizontal floor with a force of $$40\ \mathrm{N}. $$The coefficient of kinetic friction is $$0.4. $$What is the acceleration of the box? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$0.8\ \mathrm{m/s^2$}$$

Question 15

A $$2.0\ \mathrm{kg}$$ block is at rest on a frictionless surface. A force of $$10\ \mathrm{N} is $$applied for $$3.0\ \mathrm{s}. $$What is the final speed of the block?

Accepted Answer

$$15\ \mathrm{m/s}$$

Question 16

A $$0.5\ \mathrm{kg}$$ ball is thrown horizontally from a $$20\ \mathrm{m}$$ high cliff with a speed of $$10\ \mathrm{m/s}. $$How far from the base of the cliff does the ball land? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$14\ \mathrm{m}$$

Question 17

A $$3.0\ \mathrm{kg}$$ object is acted on by two forces: $$F_1 = 10$$\ \mathrm{N}$$ east and F_2$ = 10\ \mathrm{N}$$ north. What is the magnitude of the object's acceleration?

Accepted Answer

$$4.7\ \mathrm{m/s^2$}$$

Question 18

A $$5.0\ \mathrm{kg}$$ box is pulled with a force of $$30\ \mathrm{N} at an $$angle of $$37^\circ$$ above the horizontal. The coefficient of kinetic friction is $$0.2. $$What is the acceleration of the box? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.1\ \mathrm{m/s^2$}$$

Question 19

A $$2.0\ \mathrm{kg}$$ block slides down a $$30^\circ$$ incline with a coefficient of kinetic friction $$\mu_k = 0.1. $$What is the acceleration of the block? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.4\ \mathrm{m/s^2$}$$

Question 20

A $$1.0\ \mathrm{kg}$$ object is suspended by a string in an elevator accelerating downward at $$2.0\ \mathrm{m/s^2$}. $$What is the tension in the string?

Accepted Answer

$$7.8\ \mathrm{N}$$

Question 21

A $$4.0\ \mathrm{kg}$$ block is pushed up a frictionless $$20^\circ$$ incline with a force of $$50\ \mathrm{N}$$ parallel to the incline. What is the acceleration of the block? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$7.1\ \mathrm{m/s^2$}$$

Step-by-Step Physics Study Guidance for Quizzes 1 & 2

Study Guide - Practice Questions

Study Guide - Flashcards