Understanding Laws of Motion

What is Newton's first law of motion?

• An object will change direction only when a force is applied.

• An object will accelerate if no force is applied.

• An object will remain at rest or in uniform motion unless acted upon by an external force.

• An object will remain in motion only if it is in a vacuum.

How does mass affect the motion of an object?

• Mass makes objects move faster regardless of force.

• Mass has no effect on motion.

• Mass increases inertia, making it harder to change the motion of an object, and affects gravitational force.

• Mass decreases gravitational force only.

What is the formula for calculating force?

• F = m * a

• F = m - a

• F = m / a

• F = m + a

What does inertia mean in the context of motion?

• Inertia is the ability of an object to change its direction easily.

• Inertia is the force that causes an object to move faster.

• Inertia is the resistance of an object to change its state of motion.

• Inertia refers to the speed of an object in motion.

Can you give an example of Newton's second law of motion?

• A truck with a mass of 2000 kg traveling at 60 km/h has a force of 5000 N acting on it.

• A bicycle with a mass of 15 kg moving at a constant speed of 5 m/s.

• A car with a mass of 1000 kg accelerating at 2 m/s² exerts a force of 2000 N.

• A ball dropped from a height of 10 meters accelerates at 9.8 m/s² without any force applied.

What is the difference between speed and velocity?

• Speed can be negative while velocity cannot.

• Velocity measures distance only, not direction.

• Speed is scalar; velocity is vector (includes direction).

• Speed is always greater than velocity.

How does friction affect the motion of objects?

• Friction increases the speed of objects.

• Friction has no effect on motion.

• Friction opposes motion, slowing down or stopping objects.

• Friction only affects objects in water.

What is the role of gravity in motion?

• Gravity only affects objects in space, not on Earth.

• Gravity pulls objects towards each other, affecting their motion and trajectory.

• Gravity has no impact on the speed of moving objects.

• Gravity pushes objects away from each other.

What happens to an object in motion when no forces act on it?

• The object accelerates in the opposite direction.

• The object changes direction randomly.

• The object continues to move at a constant velocity in a straight line.

• The object comes to a stop immediately.

How do action and reaction forces work according to Newton's third law?

• Action and reaction forces are unequal and act on the same object.

• Action forces are always greater than reaction forces.

• Reaction forces occur only after action forces are applied.

• Action and reaction forces are equal in magnitude and opposite in direction, acting on different objects.