How does the time of flight of a projectile change if the initial velocity is doubled?

The time-of-flight ______________________.

• The time-of-flight doubles.
• The time-of-flight decreases by half.
• The time-of-flight quadruples.
• The time-of-flight remains the same.

Why does a projectile follow a parabolic path?

• A projectile moves in a zigzag pattern because of wind currents.
• A projectile follows a straight line due to its initial speed.
• A projectile's path is circular because of air resistance.
• A projectile follows a parabolic path because of the combination of its initial velocity and the constant acceleration due to gravity.

Which of the following will happen to the centripetal force required if the speed of an object moving in a circle is doubled? It will ________________________________________.

• halve
• quadruple.
• remain the same
• double

A satellite orbits Earth in uniform circular motion. Which of the following physical principle explains why it doesn't fall to Earth?

• The satellite is powered by a rocket engine.
• The balance of gravitational force and inertia.
• The satellite is made of lightweight materials.
• The satellite is held up by magnetic forces.

Why do cars lean inward when taking turns on banked roads?

• Cars lean inward on banked roads to       provide normal force component

• Cars lean inward to reduce tire wear during turns.
• Banked roads are designed to make cars slide outward.
• Cars lean outward to increase speed on turns.

A wrench is used to tighten a bolt. Why is it more effective to apply the force at the end of the wrench handle rather than closer to the bolt?

• The torque is directly proportional to the lever arm, so a longer lever arm produces a greater torque.

• It allows for a more comfortable grip.
• The friction between the wrench and the bolt is reduced at the end of the handle.

• It reduces the amount of force needed.

Which fundamental principle explains why ice skaters spin faster when they pull their arms close to their body?

• Conservation of energy
• Newton's first law of motion
• Frictional force reduction
• Conservation of angular momentum

Gyroscopes are used in various applications, such as stabilizing ships and aircraft. How the principle of conservation of angular momentum contributes to the stability of a gyroscope?

• Gyroscopes rely on gravitational forces to maintain stability.
• The stability of a gyroscope is due to its weight distribution.
• Gyroscopes operate based on the principles of buoyancy and fluid dynamics.
• The principle of conservation of angular momentum contributes to the stability of a gyroscope by making it resistant to changes in its orientation.

  A spinning top eventually slows down and falls over. How is this phenomenon related in terms of angular momentum and torque?

• Torque has no effect on the spinning top's motion.
• The spinning top gains speed due to increased angular momentum.
• The top remains upright indefinitely without any external forces.
• The spinning top slows down due to torque acting against its angular momentum, leading to its eventual fall.

A spinning wheel is used in a potter's wheel. How does the potter control the speed of the wheel?

• The potter controls the speed of the wheel by adjusting the foot pedal or lever.
• The potter spins the wheel by hand to change its speed.
• The speed is controlled by the temperature of the clay.
• The potter uses a remote control to adjust the speed.