Motion Equations

What are the three kinematic equations used to describe motion?

• s = vt + 0.5at^2

• v = u + at, s = ut + 0.5at^2, v^2 = u^2 + 2as

• v = u + t^2

• v^2 = u^2 + at

Define uniform linear acceleration.

• Constant rate of change of velocity over time in a straight line.

• Variable rate of change of velocity over time in a straight line.

• No change in velocity over time in a straight line.

• Acceleration in a curved path.

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How is acceleration related to velocity in uniform linear acceleration?

• Acceleration is equal to velocity in uniform linear acceleration.

• Acceleration has no relationship with velocity in uniform linear acceleration.

• Acceleration is directly proportional to velocity in uniform linear acceleration.

• Acceleration is inversely proportional to velocity in uniform linear acceleration.

If an object starts from rest and accelerates at 2 m/s^2, what is its velocity after 5 seconds?

• 15 m/s

• 8 m/s

• 3 m/s

• 10 m/s

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A car accelerates from 20 m/s to 40 m/s in 4 seconds. What is its acceleration?

• 5 m/s^2

• 7 m/s^2

• 10 m/s^2

• 3 m/s^2

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NGSS.HS-PS2-1

What is the displacement of an object moving with a constant velocity of 5 m/s for 10 seconds?

• 15 meters

• 25 meters

• 100 meters

• 50 meters

Explain the concept of initial velocity in the context of equations of motion.

• Initial velocity is the velocity of an object at the end of its motion.

• Initial velocity is the velocity of an object at the beginning of its motion.

• Initial velocity is the velocity of an object at rest.

• Initial velocity is the velocity of an object in the middle of its motion.

How can the kinematic equations be used to solve problems involving motion?

• By substituting incorrect values into the equations

• By ignoring the given variables and randomly selecting an equation

• By identifying known variables and selecting the appropriate kinematic equation to solve for the unknown variable.

• By using the equations in reverse order to confuse the problem

What is the difference between speed and velocity in the context of motion equations?

• Speed is always positive, while velocity can be negative or positive.

• Speed is scalar, only magnitude; velocity is vector, magnitude and direction.

• Speed and velocity are interchangeable terms in motion equations.

• Speed is a measure of distance covered in a unit of time; velocity is a measure of time taken to cover a distance.

If an object is dropped from a height of 100 meters, how long will it take to reach the ground?

• 2.5 seconds

• 4.51 seconds

• 6.75 seconds

• 8.92 seconds

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