Physics Chapter on Motion and Forces

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Questions and Answers

What is the relationship between static friction and normal force?

Static friction exceeds the normal force when in motion.
Static friction does not depend on the normal force at all.
Static friction is always equal to normal force.
Static friction can be less than or equal to the product of the coefficient of static friction and normal force. (correct)

Using Newton's second law, what can be inferred about the applied force in a frictional scenario?

Applied force has no relation to mass or acceleration.
The applied force is always greater than the frictional force.
The difference between applied force and frictional force equals the mass times acceleration. (correct)
The applied force equals the frictional force.

What does the kinetic friction formula represent?

The total weight of an object in motion.
The force that opposes the motion of two surfaces in contact during sliding. (correct)
The maximum force that can be applied before an object starts moving.
The force needed to keep an object at rest.

What is the correct formula to find acceleration in a two block system with tension and friction?

a = (mA * g - T) / mB (C) Signup and view all the answers

If the coefficient of kinetic friction is known, what can be calculated?

The frictional force acting on a moving object. (A) Signup and view all the answers

Which of the following is true regarding the mass of block B in a hanging scenario?

Block B’s mass contributes to the total weight acting downward. (D) Signup and view all the answers

In a system where blocks A and B are connected, what forces need to be considered for block A?

The gravitational force and the tension in the rope. (C) Signup and view all the answers

What happens to static friction as the applied force increases?

Static friction increases until it reaches a maximum value, after which the object moves. (A) Signup and view all the answers

What is the average velocity formula?

$v_{avg} = \frac{d}{t}$ (B) Signup and view all the answers

How is displacement represented mathematically?

$\Delta x = x_2 - x_1$ (C) Signup and view all the answers

Which formula represents average acceleration?

$a_{avg} = \frac{v_f - v_i}{\Delta t}$ (B) Signup and view all the answers

In the context of free falling bodies, what does $h$ represent in the equation $h = \frac{1}{2}gt^2$?

Total distance fallen (B) Signup and view all the answers

What is the gravitational force formula?

$F_g = mg$ (B) Signup and view all the answers

Which equation is used to find the final velocity in uniformly accelerated motion?

$v_f = v_i + at$ (C) Signup and view all the answers

What is the formula to calculate total distance traveled using average speed?

Total distance = $S_{avg} \times t$ (C) Signup and view all the answers

What factor is represented by $g$ in the free fall equations?

Acceleration due to gravity (B) Signup and view all the answers

What does the symbol $F_N$ represent in physics?

Normal force (A) Signup and view all the answers

How is the normal force calculated when the object is accelerating?

$F_N = m(g + a_y)$ (C) Signup and view all the answers

Which of these options correctly identifies how acceleration is typically represented?

a = $\frac{F}{m}$ (C) Signup and view all the answers

What is indicated by the relationship $v_f^2 = v_i^2 + 2ad$?

It relates initial velocity, final velocity, acceleration, and distance (C) Signup and view all the answers

Which method is used to find tension when considering both gravitational and acceleration forces?

$F_T = m(g + a)$ (C) Signup and view all the answers

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Study Notes

Unit Conversion

0.45 liters is equivalent to 450 milliliters

Average Velocity

Average velocity can be calculated using:
- distance traveled divided by elapsed time
- change in position divided by change in time

Average Speed

Average speed can be calculated by dividing total distance traveled by elapsed time

Acceleration

Acceleration can be calculated using:
- final velocity minus initial velocity divided by change in time

Constant Acceleration

Constant acceleration is also known as uniformly accelerated motion

Free Falling Bodies

Velocity is affected by gravity
- v = gt
- h = (1/2)gt^2
Time of fall can be calculated using:
- t = √(2h/g)
Velocity of fall can be calculated using:
- v = √(2gh)

Newton's Laws of Motion

Newton's second law of motion:
- Force equals mass times acceleration
Acceleration can be calculated using:
- force divided by mass
Mass can be calculated using:
- force divided by acceleration

Gravitational Force

Gravitational force can be calculated by:
- mass times gravity

Normal Force

Normal force is the force exerted by a surface on an object in contact with it.
The normal force can be calculated by:
- mass times the sum of gravity and vertical acceleration

Coefficient of Friction

Friction is a force that opposes motion
Static friction is the force that must be overcome to start motion
Kinetic friction is the force that opposes motion when an object is moving

Tension

Tension is the force exerted along the length of a stretched cable or rope

Newton's Second Law Applied

Newton's second law of motion can be applied to a scenario involving applied force, frictional force, and the resulting acceleration
- Applied force minus frictional force equals mass times acceleration

Two Equation in Two Unknowns

The two formulas for the tension and acceleration of two objects connected by a rope can be used to solve for the acceleration of the system.
- Acceleration = (mass of heavier object * gravity) / (mass of heavier object + mass of lighter object)