Grade 11 Physics Motion and Forces Quiz | 20 Questions with Answers

Explanation: Mass is a measure of inertia. An object with greater mass requires more force to change its motion compared to an object with smaller mass.

Explanation: According to Newton’s Second Law, acceleration is directly proportional to force when mass is constant.

Explanation: Force is measured in newtons in the SI system. One newton is the force required to accelerate a 1 kg mass by 1 m/s².

Explanation: During a sudden stop, inertia causes the body to keep moving forward. Seat belts apply a force that slows the body safely and reduces the risk of injury.

Explanation: Friction acts in the opposite direction of motion and reduces speed. It occurs due to contact between two surfaces.

Explanation: When the bus stops suddenly, the passenger’s body tends to continue moving forward due to inertia, which resists sudden changes in motion.

Explanation: Newton’s First Law states that an object remains at rest or in uniform motion unless acted upon by an external force. This tendency to resist change in motion is called inertia.

Explanation: Inertia is a property of matter by which an object resists any change in its state of rest or motion. Objects with more mass have greater inertia.

Explanation: Friction depends mainly on how rough or smooth the surfaces are. Rough surfaces produce more friction than smooth ones.

Explanation: Zero net force means balanced forces. In this case, there is no acceleration, and the object maintains its current state of motion.

Explanation: Speed measures how fast an object is moving and depends only on distance traveled per unit time. It does not include direction, which makes it a scalar quantity.

Explanation: Newton’s Second Law states that acceleration depends on the force applied and the mass of the object. Greater force produces greater acceleration, while greater mass reduces acceleration.

Explanation: In physics, motion means that an object changes its position relative to a reference point as time passes. If an object does not change its position with respect to its surroundings, it is considered at rest.

Explanation: Velocity includes both speed and direction. If either the speed or direction of motion changes, the velocity of the object also changes.

Explanation: Acceleration occurs when there is a change in speed, direction, or both. Even an object moving at constant speed in a circular path is accelerating due to change in direction.

Explanation: Momentum depends on both mass and velocity. An object with greater mass or higher velocity has greater momentum.

Explanation: Gravitational force is the attractive force between masses. Earth’s gravity pulls objects toward its center.

Explanation: Newton’s Third Law explains that forces always occur in pairs. When one object exerts a force on another, the second object exerts an equal force in the opposite direction.

Explanation: Uniform motion means equal distances are covered in equal intervals of time in the same direction.

Explanation: A force can change the speed, direction, or shape of an object. Without force, an object continues in its current state of motion according to Newton’s First Law.