Newton's Laws of Motion _ A-Level Physics

The video tutorial covers Newton's three laws of motion, explaining each with examples. Newton's First Law discusses inertia and constant velocity. The Second Law relates force to momentum change, introducing F=ma. The Third Law explains action-reaction pairs. The concept of impulse is introduced, showing its relation to force and time, and how to calculate it using force-time graphs.

What does Newton's first law of motion state about a body at rest or in uniform motion?

• It will always accelerate.

• It will stop moving after some time.

• It will change its state of motion spontaneously.

• It will remain at rest or in uniform motion unless acted upon by a resultant force.

How is momentum defined in physics?

• The sum of mass and velocity.

• The product of mass and velocity.

• The difference between mass and velocity.

• The ratio of mass to velocity.

In the lorry example, what does the negative sign of the braking force indicate?

• The force is increasing the speed of the lorry.

• The force is not affecting the lorry's motion.

• The force is acting in the opposite direction to the motion.

• The force is acting in the same direction as the motion.

According to Newton's third law, what happens when one body exerts a force on another?

• The second body exerts a force of different magnitude in the same direction.

• The second body exerts a force of equal magnitude in the opposite direction.

• The second body does not exert any force.

• The second body exerts a force of equal magnitude in the same direction.

What is impulse in physics?

• The product of force and distance.

• The product of force and time.

• The sum of force and time.

• The difference between force and time.