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Question 1:

What is free fall?

A) The motion of an object in the absence of air resistance
B) The motion of an object under the influence of gravitational force only
C) The motion of an object thrown horizontally
D) The motion of an object with a constant velocity

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Explanation: The correct answer is B) The motion of an object under the influence of gravitational force only. Free fall refers to the motion of an object when the only force acting on it is gravity. In free fall, the object experiences an acceleration due to gravity and its velocity changes accordingly.

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Question 2:

At what rate does an object accelerate in free fall near the surface of the Earth?

A) 9.8 m/s
B) 9.8 m/s^2
C) 9.8 N
D) 9.8 kg

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Explanation: The correct answer is B) 9.8 m/s^2. In free fall near the surface of the Earth, objects accelerate at a rate of approximately 9.8 m/s^2. This acceleration is due to the force of gravity acting on the object, and it is often denoted by the symbol "g".

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Question 3:

What is projectile motion?

A) The motion of an object thrown vertically
B) The motion of an object with a constant velocity
C) The motion of an object under the influence of air resistance
D) The motion of an object launched at an angle to the horizontal

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Explanation: The correct answer is D) The motion of an object launched at an angle to the horizontal. Projectile motion refers to the motion of an object that is launched into the air at an angle to the horizontal. In projectile motion, the object follows a curved path influenced by both its initial velocity and the force of gravity.

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Question 4:

What is the shape of the trajectory followed by a projectile in the absence of air resistance?

A) Parabolic
B) Circular
C) Elliptical
D) Linear

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Explanation: The correct answeris A) Parabolic. In the absence of air resistance, the shape of the trajectory followed by a projectile is a parabola. The object initially moves upward, reaches its highest point, and then falls back down following a symmetric curved path.

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Question 5:

Which of the following quantities remains constant for a projectile in the absence of air resistance?

A) Displacement
B) Velocity
C) Acceleration
D) Energy

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Explanation: The correct answer is C) Acceleration. For a projectile in the absence of air resistance, the acceleration remains constant. The object experiences a constant acceleration due to gravity, but there are no other forces acting on it horizontally. Therefore, the acceleration in the horizontal direction is zero.