Multiple Choice Questions
Sports Science and Biomechanics
Topic: Sports Science and Biomechanics
Grade: 11
Question 1:
Which of the following statements is true regarding the principle of inertia?
A) Inertia is the tendency of an object to resist changes in its motion.
B) Inertia is directly proportional to the mass of an object.
C) Inertia is inversely proportional to the force acting on an object.
D) Inertia is only applicable to objects at rest.
Answer: A) Inertia is the tendency of an object to resist changes in its motion.
Explanation: The principle of inertia states that an object will remain at rest or continue moving at a constant velocity unless acted upon by an external force. This means that an object with more mass will have more inertia and will be more resistant to changes in its motion. For example, if a car is at rest and a force is applied to it, the car will resist moving due to its inertia. Similarly, if a moving car suddenly stops, the passengers inside will continue moving forward due to their inertia.
Question 2:
Which of the following factors affect projectile motion?
A) Angle of projection and height from which the object is projected.
B) Mass and shape of the projectile.
C) Air resistance and gravitational force.
D) All of the above.
Answer: D) All of the above.
Explanation: Projectile motion is the motion of an object that is projected into the air and then follows a curved path under the influence of gravity. The angle of projection and the height from which the object is projected determine the range and trajectory of the projectile. The mass and shape of the projectile can also affect its motion, as objects with different masses and shapes experience different amounts of air resistance. Finally, the force of gravity acts on the projectile throughout its motion, causing it to follow a curved path.
Question 3:
Which of the following is an example of a first-class lever?
A) Elbow joint during a bicep curl.
B) Scissors.
C) Wheelbarrow.
D) Baseball bat.
Answer: C) Wheelbarrow.
Explanation: A first-class lever is a type of lever where the fulcrum is located between the effort and the load. In a wheelbarrow, the wheel acts as the fulcrum, the effort is applied at the handles, and the load is placed in the bin. When the effort is applied, the wheelbarrow pivots around the fulcrum, allowing the load to be lifted. This is similar to how a seesaw or a crowbar works.
Question 4:
Which of the following statements is true regarding the principle of conservation of angular momentum?
A) Angular momentum is constant when no external torques act on a system.
B) Angular momentum is directly proportional to the moment of inertia.
C) Angular momentum is inversely proportional to the angular velocity.
D) Angular momentum is only applicable to rotating objects.
Answer: A) Angular momentum is constant when no external torques act on a system.
Explanation: The principle of conservation of angular momentum states that the total angular momentum of a system remains constant unless acted upon by an external torque. This means that if no external torques act on a system, its angular momentum will remain constant. For example, when a figure skater pulls in their arms during a spin, their moment of inertia decreases, causing their angular velocity to increase in order to conserve angular momentum.
Question 5:
Which of the following is an example of a third-class lever?
A) Elbow joint during a bicep curl.
B) Scissors.
C) Wheelbarrow.
D) Baseball bat.
Answer: A) Elbow joint during a bicep curl.
Explanation: A third-class lever is a type of lever where the effort is located between the fulcrum and the load. When performing a bicep curl, the elbow joint acts as the fulcrum, the bicep muscle applies the effort, and the weight being lifted acts as the load. The effort is applied closer to the fulcrum than the load, which allows for a greater range of motion but requires more effort to lift the load. This is similar to how a fishing rod or a tennis racket works.