Question 1

A car accelerates uniformly from rest to a velocity of $$20\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the magnitude of its acceleration?

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 2

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is a measure of the amount of matter in an object, while weight is the force exerted on that mass by gravity.

Question 3

A vector $$\vec{A}$$ has components $$A_x = 3$$ and $$A_y = 4. $$What is the magnitude of $$\vec{A}$$?

Accepted Answer

$$5$$

Question 4

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

Accepted Answer

$$11.5\ \mathrm{m}$$

Question 5

Which of the following statements about Newton's First Law is correct?

Accepted Answer

An object at rest remains at rest, and an object in motion remains in motion at constant velocity unless acted upon by a net external force.

Question 6

A $$2\ \mathrm{kg}$$ block is pulled across a frictionless surface by a horizontal force of $$10\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

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

Question 7

A projectile is launched at an angle of $$30^\circ$$ above the horizontal with an initial speed of $$40\ \mathrm{m/s}. $$What is the initial vertical component of its velocity?

Accepted Answer

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

Question 8

Which of the following is the correct unit vector in the direction of $$\vec{A} = 3\hat{i} - 4\hat{j}$$?

Accepted Answer

$$0.6\hat{i} - 0.8\hat{j}$$

Question 9

A skydiver of mass $$80\ \mathrm{kg} is $$falling at terminal velocity. Which statement is true about the forces acting on the skydiver?

Accepted Answer

The upward force of air resistance equals the downward force of gravity.

Question 10

A cyclist travels $$3\ \mathrm{km}$$ east, then $$4\ \mathrm{km}$$ north. What is the magnitude of the displacement from the starting point?

Accepted Answer

$$5\ \mathrm{km}$$

Question 11

A $$5\ \mathrm{kg}$$ object is acted on by two forces: $$\vec{F}_1 = 10\hat{i}\ \mathrm{N}$$ and $$\vec{F}_2 = -6\hat{i}\ \mathrm{N}. $$What is the acceleration of the object?

Accepted Answer

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

Question 12

Which of the following best describes the direction of acceleration for an object moving in a circle at constant speed?

Accepted Answer

Toward the center of the circle

Question 13

A $$10\ \mathrm{kg}$$ box is at rest on a horizontal surface. The coefficient of static friction between the box and the surface is $$0.5. $$What is the minimum horizontal force required to start moving the box? (Take $$g = 9.8\ \mathrm{m/s^2$}.)$$

Accepted Answer

$$49\ \mathrm{N}$$

Question 14

A student throws a ball horizontally from a $$20\ \mathrm{m}$$ high cliff. How long does it take for the ball to hit the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$}.)$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 15

Which of the following is NOT a vector quantity?

Accepted Answer

Speed

Question 16

A $$1.5\ \mathrm{kg}$$ object is moving with a velocity of $$4\ \mathrm{m/s}. $$What is its momentum?

Accepted Answer

$$6\ \mathrm{kg\cdot m/s}$$

Question 17

A $$0.2\ \mathrm{kg}$$ apple falls from a tree and hits the ground in $$1.5\ \mathrm{s}. $$What is its velocity just before hitting the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$}.)$$

Accepted Answer

$$14.7\ \mathrm{m/s}$$

Question 18

A $$3\ \mathrm{kg}$$ object is moving in a straight line with a constant velocity. What is the net force acting on it?

Accepted Answer

$$0\ \mathrm{N}$$

Question 19

A $$2\ \mathrm{kg}$$ object is moving in a circle of radius $$0.5\ \mathrm{m} at a $$constant speed of $$4\ \mathrm{m/s}. $$What is the magnitude of the centripetal force acting on the object?

Accepted Answer

$$64\ \mathrm{N}$$

Fundamental Concepts in Physics: Vectors, Motion, and Newton's Laws

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