Projectile motion
What happens to the horizontal component of velocity over the course of projectile motion?
A) It increases continuously
B) It decreases continuously
C) It remains constant.
D) It varies sinusoidally
C) It remains constant.
What is the force responsible for pulling an object down an inclined plane? (1 mark)
A) Normal force
B) Friction force
C) Component of gravitational force parallel to the incline
D) Centripetal force
C) Component of gravitational force parallel to the incline
How does air resistance affect the trajectory of a projectile?
It decreases the range of the projectile.
2. Which of the following factors affects the range of a projectile launched from the ground at a certain angle?
A) Initial vertical velocity
B) Initial horizontal velocity.
C) Mass of the projectile
D) Height of the launch point
B) Initial horizontal velocity.
What happens to the normal force acting on an object as the angle of the incline increases? (1 mark)
A) It increases
B) It remains the same
C) It decreases
D) It becomes equal to the object's weight
C) It decreases
What are the components of the weight on an inclined plane ?
Wx= Wsin 𝚹
Wy = W cos 𝚹
If two projectiles are launched from the same height but with different initial speeds, which one will have a longer time of flight?
A) The one with the higher initial speed
B) The one with the lower initial speed
C) Both will have the same time of flight.
D) Cannot be determined without additional information
C) Both will have the same time of flight.
If an object is sliding down an inclined plane at constant speed, what does this indicate about the forces acting on it?
A) Gravity is stronger than friction
B) Friction is stronger than gravity
C) The force pulling the object down the incline is equal to friction
D) There is no friction
C) The force pulling the object down the incline is equal to friction
Historically, pearl divers in Qatar would jump from boats into the sea. How does their trajectory follow projectile motion, and how does their landing depend on their jumping angle and speed?
As soon as a diver jumps off the boat, they follow a parabolic path due to the influence of gravity.
4. What is the shape of the trajectory followed by a projectile launched horizontally from a certain height above the ground?
A) Straight line
B) Parabola.
C) Circle
D) Ellipse
B) Parabola.
On a frictionless inclined plane, what is the acceleration of an object sliding down dependent on? (1 mark)
A) The mass of the object
B) The normal force
C) The angle of the incline
D) The surface area of the object
C) The angle of the incline
A 3 kg bike is placed on a smooth inclined plane that makes a 20° angle with the horizontal.
a) Calculate the force acting down the incline due to gravity.
2.8
5. At which point in its trajectory does a projectile have its maximum potential energy?
A) At the highest point.
B) At the lowest point
C) At the midpoint
D) Potential energy remains constant throughout the trajectory
A) At the highest point.
A box is placed on an inclined plane. What happens if the angle of the incline is increased while friction is present?
A) The component of gravity parallel to the incline increases
B) The normal force increases
C) The friction force increases
D) The box will always remain at rest
A) The component of gravity parallel to the incline increases
What is the normal force on an inclined plane ?
Wy