Lesson 8, 9, 10: Free Fall, Projectile Motion, Circular Motion Flashcards
What is accelerated motion?
A. Motion with a constant velocity
B. Motion with a changing velocity
C. Motion with no speed change
D. Motion that is always circular
B. Motion with a changing velocity
Which of the following is an example of accelerated motion?
A. Free fall
B. Circular motion
C. Projectile motion
D. All of the above
D. All of the above
What is free fall?
A. Motion under the influence of both gravity and air resistance
B. Accelerated motion of an object due to gravity alone
C. Motion at a constant velocity in space
D. A type of circular motion around the Earth
B. Accelerated motion of an object due to gravity alone
In free fall, what is the approximate acceleration due to gravity (g) near Earth’s surface?
A. 1 m/s²
B. 2 m/s²
C. 9.8 m/s²
D. 25 m/s²
C. 9.8 m/s²
How does the acceleration due to gravity (g) change on different celestial bodies?
A. It stays constant on all planets
B. It increases as the size of the planet decreases
C. It depends on the mass of the planet, star, or satellite
D. It is the same as Earth’s on other planets
C. It depends on the mass of the planet, star, or satellite
Which celestial body has the highest acceleration due to gravity?
A. Moon
B. Pluto
C. Jupiter
D. Sun
D. Sun
(Explanation: g = 274 m/s²)
What is the acceleration due to gravity on the Moon?
A. 1 m/s²
B. 2 m/s²
C. 4 m/s²
D. 9.8 m/s²
B. 2 m/s²
What is the key difference between mass and weight?
A. Mass depends on gravity, while weight does not
B. Weight depends on gravity, while mass does not
C. Mass varies with location, while weight remains constant
D. Weight is a measure of the quantity of matter in an object
B. Weight depends on gravity, while mass does not
Which of the following is true about mass?
A. Mass changes with location
B. Mass is the same as weight
C. Mass is the quantity of matter present in an object
D. Mass depends on gravitational force
C. Mass is the quantity of matter present in an object
Why does weight depend on location?
A. Because weight depends on the object’s velocity
B. Because weight depends on the local gravitational acceleration (g)
C. Because weight changes based on mass
D. Because weight is the same as mass
B. Because weight depends on the local gravitational acceleration (g)
What is true weight?
A. The force that an object exerts on a weighing scale
B. The mass of the object multiplied by velocity
C. The gravitational force on an object, equal to
𝑤=𝑚𝑔
w=mg
D. The force that acts on an object in space
C. The gravitational force on an object, equal to
𝑤=𝑚g
w=mg
What is apparent weight?
A. The actual mass of an object
B. The force that an object exerts on a weighing scale
C. The weight measured without considering gravity
D. The force that acts on an object only in space
B. The force that an object exerts on a weighing scale
On which planet would you weigh the most based on surface gravity?
A. Mercury
B. Moon
C. Jupiter
D. Pluto
C. Jupiter
(Explanation: Jupiter has a surface gravity of 25 m/s²)
What would happen to your weight if you were on the Moon instead of Earth?
A. Your weight would stay the same
B. Your weight would decrease because g on the Moon is lower
C. Your weight would increase because the Moon has less mass
D. Your weight would increase because the Moon has higher gravity
B. Your weight would decrease because g on the Moon is lower
Why is air resistance considered negligible in free fall?
A. Because objects fall faster than the speed of light
B. Because gravity is too weak to affect air resistance
C. Because air resistance has no significant impact on the object’s acceleration
D. Because air resistance is not present in outer space
C. Because air resistance has no significant impact on the object’s acceleration
What is projectile motion?
A. Motion of an object in a straight line
B. Motion of a projectile following a curved path
C. Motion with constant speed in a straight line
D. Motion with no horizontal velocity
B. Motion of a projectile following a curved path
What is the curved path that a projectile follows called?
A. Arc
B. Slope
C. Trajectory
D. Tangent
C. Trajectory
Which of the following statements is true about projectile motion?
A. It only has vertical velocity components
B. It only has horizontal velocity components
C. It has both vertical and horizontal velocity components
D. It has no velocity components
C. It has both vertical and horizontal velocity components
In projectile motion, what describes the vertical velocity component?
A. Motion with constant speed
B. Motion with constant velocity
C. Motion with constant acceleration
D. Motion with no acceleration
C. Motion with constant acceleration
What does the horizontal velocity component describe in projectile motion?
A. Motion with constant acceleration
B. Motion with constant speed
C. Motion with increasing speed
D. Motion with changing direction
B. Motion with constant speed
How are the vertical and horizontal velocity components related in projectile motion?
A. They depend on each other
B. They are independent of each other
C. The horizontal component affects the vertical component
D. The vertical component affects the horizontal component
B. They are independent of each other
Why can we break up projectile motion into two separate 1-D problems?
A. Because there is no acceleration
B. Because the vertical and horizontal motions are independent
C. Because projectiles move in only one direction
D. Because gravity only affects the horizontal motion
B. Because the vertical and horizontal motions are independent
Which of the following describes the horizontal motion in projectile motion?
A. Motion with constant acceleration
B. Motion with constant speed
C. Motion with decreasing speed
D. Motion with no velocity
B. Motion with constant speed
In projectile motion, what happens to the horizontal velocity over time (neglecting air resistance)?
A. It increases
B. It decreases
C. It remains constant
D. It fluctuates randomly
C. It remains constant
What kind of motion does the vertical component of projectile motion experience?
A. Motion with changing speed
B. Motion with constant speed
C. Motion with constant acceleration due to gravity
D. Motion with no speed
C. Motion with constant acceleration due to gravity
What is the range in projectile motion?
A. The total vertical distance the projectile travels
B. The horizontal distance a projectile travels before returning to its initial height
C. The distance from the starting point to the highest point in its trajectory
D. The length of the trajectory curve
B. The horizontal distance a projectile travels before returning to its initial height
How do you calculate the velocity at any point in a projectile’s trajectory?
A. By considering only the horizontal velocity
B. By considering only the vertical velocity
C. By combining the horizontal and vertical velocity components
D. By subtracting the horizontal velocity from the vertical velocity
C. By combining the horizontal and vertical velocity components
What type of motion is projectile motion most closely related to?
A. Free fall with an initial horizontal velocity
B. Circular motion with no velocity
C. Constant speed in a straight line
D. Accelerated motion in only one dimension
A. Free fall with an initial horizontal velocity
In projectile motion, what happens at the highest point in the trajectory?
A. The vertical velocity is at its maximum
B. The horizontal velocity is zero
C. The vertical velocity is zero
D. The projectile stops moving
C. The vertical velocity is zero
Which factor does not affect the horizontal range of a projectile (assuming no air resistance)?
A. The initial horizontal velocity
B. The angle of projection
C. The gravitational acceleration (g)
D. The mass of the projectile
D. The mass of the projectile
What happens to an object’s speed as it falls downward with air resistance?
A. Its speed decreases
B. Its speed remains constant
C. Its speed increases
D. Its speed fluctuates randomly
C. Its speed increases
What happens to an object’s acceleration as it falls downward through air resistance?
A. It increases
B. It decreases
C. It remains constant
D. It fluctuates randomly
B. It decreases
What is terminal speed?
A. The speed at which an object starts falling
B. The speed at which an object continues to accelerate
C. The constant speed an object reaches when drag equals its weight
D. The speed at which an object stops moving
C. The constant speed an object reaches when drag equals its weight
What happens to the acceleration of an object at terminal speed?
A. It increases
B. It decreases
C. It becomes zero
D. It fluctuates
C. It becomes zero
What is escape speed for Earth?
A. 11 m/s
B. 1,100 m/s
C. 11,000 m/s
D. 110,000 m/s
C. 11,000 m/s
Which of the following is true about an object launched upward at escape speed?
A. It will always return to Earth
B. It will escape Earth’s gravity
C. It will eventually slow down and stop
D. It will follow a straight line to space
B. It will escape Earth’s gravity
In circular motion, the force responsible for keeping an object in the circular path is called?
A. Centripetal force
B. Gravitational force
C. Frictional force
D. Tangential force
A. Centripetal force
In uniform circular motion, what happens to the object’s speed?
A. It increases
B. It decreases
C. It remains constant
D. It fluctuates
C. It remains constant
In uniform circular motion, what happens to the direction of velocity?
A. It remains constant
B. It changes continuously
C. It decreases as the object moves
D. It increases in a straight line
B. It changes continuously
What is centripetal acceleration in uniform circular motion?
A. Acceleration pointing away from the center
B. Acceleration pointing towards the center
C. Acceleration along the tangent to the path
D. Acceleration due to gravity
B. Acceleration pointing towards the center
Why doesn’t an object in uniform circular motion move into the center of the circle?
A. Because the force is too weak
B. Because it has a velocity tangent to the path
C. Because there is no centripetal force
D. Because of air resistance
B. Because it has a velocity tangent to the path
In non-uniform circular motion, what happens to the object’s speed?
A. It increases
B. It decreases
C. It varies
D. It remains constant
C. It varies
In non-uniform circular motion, which component of acceleration is responsible for changing the direction of velocity?
A. Tangential acceleration
B. Radial or centripetal acceleration
C. Gravitational acceleration
D. Terminal acceleration
B. Radial or centripetal acceleration
Which component of acceleration changes the magnitude of velocity in non-uniform circular motion?
A. Radial acceleration
B. Centripetal acceleration
C. Tangential acceleration
D. Gravitational acceleration
C. Tangential acceleration
Why does the acceleration of a projectile always point downward?
A. Because of centripetal force
B. Because of friction
C. Because of a downward gravitational force
D. Because of air resistance
C. Because of a downward gravitational force
