Mechanics and Laws of Motion MCQs 2026

If the net (resultant) force acting on a body is zero, the body is said to be in a state of

1. AEquilibrium✓
2. BUniform acceleration✓
3. CFree fall✓
4. DCircular motion✓

Newton's first law of motion is also known as the law of

1. ALaw of Acceleration✓
2. BLaw of Action-Reaction✓
3. CLaw of Inertia✓
4. DLaw of Gravitation✓

Newton's second law of motion states that force equals

1. AMass times acceleration✓
2. BMass divided by acceleration✓
3. CMass times velocity✓
4. DMass times displacement✓

Newton's third law states that for every action there is an equal and opposite

1. AMass✓
2. BVelocity✓
3. CAcceleration✓
4. DReaction✓

The property of a body by which it resists any change in its state of rest or motion is called

1. AMomentum✓
2. BInertia✓
3. CForce✓
4. DTorque✓

Momentum of a body is defined as the product of its

1. AMass and velocity squared✓
2. BMass and acceleration✓
3. CMass and velocity✓
4. DWeight and velocity✓

The SI unit of momentum is

1. ANewton✓
2. BKilogram metre per second✓
3. CJoule✓
4. DWatt✓

According to the law of conservation of momentum, the total momentum of an isolated system

1. ARemains constant✓
2. BAlways increases✓
3. CAlways decreases✓
4. DBecomes zero✓

Impulse is defined as the product of force and

1. AMass✓
2. BDistance✓
3. CVelocity✓
4. DTime✓

The SI unit of impulse is the same as that of

1. AForce✓
2. BEnergy✓
3. CMomentum✓
4. DPower✓

The force that opposes relative motion between two surfaces in contact is called

1. ATension✓
2. BFriction✓
3. CNormal force✓
4. DCentripetal force✓

The type of friction that acts on a body at rest is called

1. AStatic friction✓
2. BKinetic friction✓
3. CRolling friction✓
4. DFluid friction✓

The coefficient of friction is defined as the ratio of

1. ANormal force to friction force✓
2. BMass to weight✓
3. CVelocity to acceleration✓
4. DFriction force to normal force✓

Compared to sliding friction, rolling friction is generally

1. AEqual✓
2. BLess✓
3. CGreater✓
4. DInfinite✓

In uniform circular motion, the centripetal force acts

1. AAway from the center✓
2. BTangent to the path✓
3. CTowards the center✓
4. DOpposite to velocity✓

The centripetal force required to keep a body of mass m moving in a circle of radius r with speed v is given by

1. Amv^2/r✓
2. Bmv/r✓
3. Cmvr✓
4. Dmr/v^2✓

The apparent outward force felt in a rotating frame of reference is called

1. ACentripetal force✓
2. BGravitational force✓
3. CNormal force✓
4. DCentrifugal force✓

Angular velocity is measured in units of

1. AMetres per second✓
2. BRadians per second✓
3. CNewtons✓
4. DJoules✓

Torque is defined as the product of force and the

1. AMass of the body✓
2. BTime of application✓
3. CPerpendicular distance from the axis✓
4. DVelocity of the body✓

The SI unit of torque is

1. ANewton-metre✓
2. BJoule-second✓
3. CWatt✓
4. DPascal✓

Quickly pulling a tablecloth out from under dishes without disturbing them demonstrates the

1. ALaw of conservation of energy✓
2. BLaw of friction✓
3. CThird law of motion✓
4. DLaw of inertia (first law of motion)✓

Walking on the ground would be very difficult without sufficient

1. AGravity✓
2. BFriction✓
3. CMomentum✓
4. DTorque✓

The forward propulsion of a rocket in the vacuum of space is best explained by the

1. APresence of air to push against✓
2. BLaw of gravitation✓
3. CLaw of conservation of momentum✓
4. DCentripetal force✓

According to Newton's third law, action and reaction forces always act on

1. AThe same body✓
2. BThe same point✓
3. CParallel bodies✓
4. DTwo different bodies✓

Force is generally defined as any influence that can cause a body to

1. AChange its state of rest or motion✓
2. BRemain permanently at rest✓
3. CLose its mass✓
4. DChange its chemical composition✓

The SI unit of force is the

1. ADyne✓
2. BNewton✓
3. CErg✓
4. DWatt✓

The single force that produces the same effect as two or more forces acting together on a body is called the

1. AApplied force✓
2. BBalanced force✓
3. CResultant force✓
4. DFrictional force✓

Newton's second law of motion can also be expressed as force equal to the rate of change of

1. AMomentum✓
2. BMass✓
3. CDisplacement✓
4. DAngular velocity✓

The rate of change of angular velocity with time is called

1. AAngular displacement✓
2. BAngular acceleration✓
3. CLinear velocity✓
4. DTorque✓

In uniform circular motion, the speed of the body remains constant but its velocity changes because the

1. AMass changes continuously✓
2. BAcceleration is zero✓
3. CForce acting is zero✓
4. DDirection of motion keeps changing✓

The maximum value of static friction is generally

1. AGreater than kinetic friction✓
2. BLess than kinetic friction✓
3. CEqual to zero✓
4. DEqual to the normal force✓

When a person walks forward, the forward force on the person is the reaction to the force the foot exerts

1. AOn the person's own body✓
2. BOn the air✓
3. CBackward on the ground✓
4. DUpward against gravity✓

The recoil of a gun when a bullet is fired is best explained by the

1. ALaw of gravitation✓
2. BLaw of conservation of momentum✓
3. CLaw of friction✓
4. DPrinciple of moments✓

An astronaut floating freely inside an orbiting spacecraft, in the absence of a net force, illustrates

1. ANewton's third law✓
2. BNewton's second law✓
3. CThe law of gravitation✓
4. DNewton's first law (inertia)✓

A frame of reference in which Newton's laws of motion hold true without modification is called an

1. AInertial frame✓
2. BNon-inertial frame✓
3. CRotating frame✓
4. DAccelerated frame✓

Unlike mass, the weight of a body

1. AIs always constant everywhere✓
2. BIs measured in kilograms✓
3. CVaries with the local value of gravity✓
4. DHas no direction✓

The shortest straight-line distance between the initial and final position of a body is called its

1. ADistance✓
2. BSpeed✓
3. CPath length✓
4. DDisplacement✓

Distance is a scalar quantity while displacement is

1. AA vector quantity✓
2. BAlso a scalar quantity✓
3. CDimensionless✓
4. DAlways zero✓

The rate of change of displacement with time is called

1. ASpeed✓
2. BVelocity✓
3. CAcceleration✓
4. DMomentum✓

For a body moving with uniform acceleration a and initial velocity u, the velocity after time t is given by

1. Av = u + 2at✓
2. Bv = u - at✓
3. Cv = u + at✓
4. Dv = at✓

The equation v^2 = u^2 + 2as relates final velocity to

1. ATime and mass✓
2. BMass and distance✓
3. CTime and acceleration only✓
4. DInitial velocity, acceleration, and distance✓

The equation of motion s = ut + (1/2)at^2 gives the

1. AFinal velocity✓
2. BDistance covered✓
3. CAverage acceleration✓
4. DMomentum✓

The path followed by a projectile under gravity, neglecting air resistance, is a

1. AParabola✓
2. BStraight line✓
3. CCircle✓
4. DEllipse✓

For a projectile launched from the ground, the angle of projection that gives the maximum horizontal range is

1. A30 degrees✓
2. B60 degrees✓
3. C45 degrees✓
4. D90 degrees✓

The acceleration due to gravity near the Earth's surface is approximately

1. A6.4 m/s^2✓
2. B3.8 m/s^2✓
3. C12.6 m/s^2✓
4. D9.8 m/s^2✓

The weight of a body is the force with which the Earth attracts it, and its SI unit is the

1. AKilogram✓
2. BNewton✓
3. CJoule✓
4. DPascal✓

The linear velocity v of a point moving in a circle of radius r with angular velocity omega is related by

1. Av = omega / r✓
2. Bv = r / omega✓
3. Cv = r times omega✓
4. Dv = r + omega✓

A body is said to be in static equilibrium when it

1. AMoves with constant velocity✓
2. BAccelerates uniformly✓
3. CRotates at constant speed✓
4. DRemains at rest under balanced forces✓

A diagram showing all the forces acting on an isolated body is called a

1. AVector diagram✓
2. BFree-body diagram✓
3. CCircuit diagram✓
4. DPhase diagram✓

A quantity that has both magnitude and direction is called a

1. AScalar✓
2. BConstant✓
3. CVector✓
4. DCoefficient✓