Unit 1: Kinematics Flashcards by Nes'et Kablan

What is the definition of displacement?

Displacement is the change in position of an object, defined as the final position minus the initial position.

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What is the formula for average velocity?

Average velocity is calculated as displacement divided by time: v_avg = Δx / Δt.

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True or False: Speed is a vector quantity.

False: Speed is a scalar quantity.

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What does the slope of a position vs. time graph represent?

The slope of a position vs. time graph represents the velocity of the object.

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Fill in the blank: The formula for acceleration is ______.

a = (v_f - v_i) / Δt

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What is the unit of acceleration in the SI system?

The unit of acceleration is meters per second squared (m/s²).

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What is the difference between instantaneous velocity and average velocity?

Instantaneous velocity is the velocity of an object at a specific moment in time, while average velocity is the total displacement divided by the total time taken.

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If an object is moving with constant acceleration, what does its velocity-time graph look like?

The velocity-time graph is a straight line with a slope equal to the acceleration.

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What is the equation of motion for an object under constant acceleration?

The equations of motion are: v_f = v_i + at, Δx = v_i t + 0.5at², and v_f² = v_i² + 2aΔx.

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What does a horizontal line on a velocity-time graph indicate?

A horizontal line on a velocity-time graph indicates that the object is moving at a constant velocity.

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True or False: In free fall, the only force acting on an object is gravity.

True.

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What is the value of gravitational acceleration near the surface of the Earth?

The value of gravitational acceleration is approximately 9.81 m/s².

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What is uniform motion?

Uniform motion is when an object moves at a constant speed in a straight line.

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Fill in the blank: The area under a velocity-time graph represents ______.

displacement.

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What is the formula for calculating displacement using initial velocity, time, and acceleration?

The formula is Δx = v_i t + 0.5 a t².

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What is the difference between scalar and vector quantities?

Scalar quantities have magnitude only, while vector quantities have both magnitude and direction.

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What does ‘v_i’ represent in the equations of motion?

‘v_i’ represents the initial velocity of the object.

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What is the significance of the y-intercept in a position-time graph?

The y-intercept represents the initial position of the object.

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True or False: An object can have a negative velocity.

True: Negative velocity indicates motion in the opposite direction.

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What is the formula for final velocity in terms of initial velocity, acceleration, and time?

The formula is v_f = v_i + at.

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Fill in the blank: The term ‘free fall’ refers to motion under the influence of ______.

gravity only.

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What is a projectile?

A projectile is an object that is thrown into the air with an initial velocity and is subject to gravitational acceleration.

What is the trajectory of a projectile launched at an angle?

The trajectory of a projectile launched at an angle is a parabolic path.

What does ‘a’ represent in the equation a = (v_f - v_i) / Δt?

‘a’ represents acceleration.

What is the formula for calculating the distance traveled under constant acceleration?

The formula is d = v_i t + 0.5 a t².

What is the relationship between distance and displacement?

Distance is a scalar quantity representing the total path length traveled, while displacement is a vector quantity representing the shortest path from initial to final position.

True or False: An object can accelerate while moving at constant speed.

True: An object can accelerate if its direction changes, even if its speed remains constant.

What is the effect of air resistance on a falling object?

Air resistance opposes the motion of a falling object and affects its acceleration.

What does the term 'kinematic equations' refer to?

Kinematic equations are a set of equations that describe the motion of an object under constant acceleration.

Fill in the blank: The formula for calculating the final velocity squared is ______.

v_f² = v_i² + 2aΔx.

What is the significance of the slope in a displacement-time graph?

The slope in a displacement-time graph indicates the speed of the object.

What is the formula to find the average acceleration?

Average acceleration is given by a_avg = (v_f - v_i) / Δt.

True or False: Velocity can be zero even if the object is in motion.

True: An object can have zero velocity at the peak of its motion.

What does the term 'uniformly accelerated motion' mean?

Uniformly accelerated motion refers to motion in which the acceleration is constant.

What is the shape of the graph for an object undergoing uniform acceleration?

The graph of displacement vs. time is a parabola.

What is the formula to calculate the displacement of an object in free fall after time t?

The formula is Δy = v_i t + 0.5 g t², where g is the acceleration due to gravity.

What does the term 'initial position' refer to?

Initial position refers to the starting location of an object before it moves.

What is the importance of the area under the curve in a velocity-time graph?

The area under the curve in a velocity-time graph represents the total displacement.

Fill in the blank: The formula for average speed is ______.

average speed = total distance / total time.

What is the primary difference between distance and displacement?

Distance is the total path length traveled, while displacement is the straight-line distance from the initial to final position.

What is the equation for horizontal motion in projectile motion?

Horizontal motion is described by x = v_x t, where v_x is the horizontal velocity.

True or False: An object can have a constant acceleration while changing its speed.

True: Constant acceleration can result in increasing or decreasing speed.

What is the formula for the vertical motion of a projectile?

Vertical motion is described by y = v_i t + 0.5 g t².

What is the significance of the initial velocity in kinematics?

Initial velocity affects how far and how fast an object will move during its motion.

What is the term for the maximum height reached by a projectile?

The maximum height is known as the apex.

Fill in the blank: The term 'kinematics' refers to the study of ______.

motion without considering the forces that cause it.

What is the relationship between acceleration and velocity?

Acceleration is the rate of change of velocity with respect to time.

What is the formula for calculating time taken when given displacement and average velocity?

Time can be calculated using t = Δx / v_avg.

What does a negative acceleration indicate?

Negative acceleration indicates that an object is slowing down or decelerating.

True or False: The kinematic equations can only be used when acceleration is constant.

True.

What is the formula for calculating the final position of an object under constant acceleration?

Δx = v_i t + 0.5 a t².

What does 'v_f' represent in motion equations?

'v_f' represents the final velocity of the object.

What is the significance of the time interval in kinematic equations?

The time interval indicates how long the motion occurs and affects both displacement and velocity.