Question 1

A 5 kg box is pulled across a horizontal surface with a constant force of 20 N. If the coefficient of kinetic friction between the box and the surface is 0.2, what is the acceleration of the box? (Assume $$g = 9.8 \ \mathrm{m/s^2$})$$

Accepted Answer

$$1.2 \ \mathrm{m/s^2$}$$

Question 2

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

Accepted Answer

The action and reaction forces are equal in magnitude and opposite in direction.

Question 3

A car rounds a flat curve of radius 50 m at a speed of 20 m/s. What is the minimum coefficient of static friction required to prevent the car from skidding?

Accepted Answer

$$0.82$$

Question 4

A block slides down a frictionless incline of height $$h. $$What is its speed at the bottom in terms of $$h$$ and $$g$$?

Accepted Answer

$$v = \sqrt{2gh}$$

Question 5

Which equation correctly represents the work done by a constant force $$\vec{F}$$ over a displacement $$\vec{\Delta x}$$?

Accepted Answer

$$W = \vec{F} \cdot \vec{\Delta x}$$

Question 6

A 2 kg object moves in a circle of radius 3 m at a constant speed of 4 m/s. What is the magnitude of the centripetal force acting on the object?

Accepted Answer

$$8.0 \ \mathrm{N}$$

Question 7

Which of the following is NOT a type of force commonly included in free-body diagrams?

Accepted Answer

Centripetal force

Question 8

A tennis ball and a bowling ball are dropped from the same height. Ignoring air resistance, which statement is true about their accelerations?

Accepted Answer

Both balls accelerate at the same rate.

Question 9

A force of $$10 \ \mathrm{N} is $$applied at an angle of $$60^\circ to $$the direction of displacement of $$5 \ \mathrm{m}. $$What is the work done by the force?

Accepted Answer

$$25 \ \mathrm{J}$$

Question 10

Which of the following best describes inertia?

Accepted Answer

The tendency of an object to resist changes in its motion.

Question 11

A 3 kg object is at rest on a frictionless surface. A constant force of 9 N is applied for 2 seconds. What is the final velocity of the object?

Accepted Answer

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

Question 12

Which of the following is the correct expression for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 13

A block of mass $$m is $$pulled by a force $$F at an $$angle $$	heta$$ above the horizontal. Which equation gives the horizontal component of the force?

Accepted Answer

$$F_x = F \cos 	heta$$

Question 14

A 10 kg box is at rest on a horizontal floor. The maximum static friction force is $$40 \ \mathrm{N}. $$What is the minimum force required to start moving the box?

Accepted Answer

$$40 \ \mathrm{N}$$

Question 15

Which of the following is the correct unit for force in the SI system?

Accepted Answer

$$\mathrm{N}$$

Question 16

A ball is thrown vertically upward with an initial velocity $$v_0. $$Which equation gives its velocity after time $$t ($$ignoring air resistance)?

Accepted Answer

$$v = v_0$ - gt$$

Question 17

Which of the following is true about the direction of the centripetal force in uniform circular motion?

Accepted Answer

It is always directed toward the center of the circle.

Question 18

A 4 kg object is moving at 3 m/s. What is its kinetic energy?

Accepted Answer

$$36 \ \mathrm{J}$$

Question 19

Which of the following is the correct vector equation for Newton's Second Law?

Accepted Answer

$$\vec{F} = m \vec{a}$$

Question 20

A box is pushed with a force of 30 N at an angle of $$45^\circ$$ above the horizontal. What is the horizontal component of the force?

Accepted Answer

$$21.2 \ \mathrm{N}$$

Dynamics in 1D and Circular Motion: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드