Dynamics
Physics ⇒ Mechanics
Dynamics starts at 10 and continues till grade 12.
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See sample questions for grade 12
Define momentum and give its SI unit.
Define the coefficient of friction.
Describe the concept of inertia with an example.
Explain the difference between static and kinetic friction.
A 0.5 kg ball moving at 10 m/s strikes a wall and rebounds with the same speed in the opposite direction. What is the change in momentum?
A 10 kg box is pulled with a force of 50 N on a horizontal surface. If the coefficient of kinetic friction is 0.2, what is the acceleration of the box? (Take g = 9.8 m/s²)
A 2 kg object moving at 3 m/s collides with a stationary 1 kg object. If they stick together after the collision, what is their final velocity?
A 3 kg object is moving in a circle of radius 2 m at a speed of 4 m/s. What is the magnitude of the centripetal force acting on it?
The net force acting on an object is zero. Which of the following statements is correct?
(1) The object must be at rest.
(2) The object must be moving at constant velocity.
(3) The object must be accelerating.
(4) The object must be moving in a circle.
Which law explains why passengers lurch forward when a car suddenly stops?
(1) Newton's First Law
(2) Newton's Second Law
(3) Newton's Third Law
(4) Law of Gravitation
Which of the following best describes an action-reaction pair?
(1) The force of gravity and the normal force on a book resting on a table
(2) The force of a bat on a ball and the force of the ball on the bat
(3) The frictional force and the applied force on a sliding box
(4) The tension and weight in a hanging mass
Which of the following is NOT a fundamental force in nature?
(1) Gravitational force
(2) Electromagnetic force
(3) Frictional force
(4) Strong nuclear force
If the net force on an object is zero, its velocity will _______.
The frictional force that prevents an object from moving when a force is applied is called _______ friction.
The product of force and the time interval over which it acts is called _______.
The rate of change of momentum of an object is equal to the _______ applied to it.
Is it possible for an object to be in motion if the net force acting on it is zero?
Is momentum conserved in an inelastic collision?
True or False: Friction always acts in the direction of motion.
True or False: The normal force always acts perpendicular to the contact surface.
