2c Force and Motion III

Which of the following statements are correct about inertia or Newton’s First Law?

A train in motion is more difficult to stop compare to a car because

The figure shows a coin resting on a cardboard placed on a glass. When the cardboard is pulled away quickly, the coin will drop into the glass. The principles involve are

By referring to the diagram, what will happen to thread A and B when thread B is jerked quickly?

The momentum of a moving object will increase when

A scientist releases a brick of mass 2 kg from a height of 5 m from the ground. What would be the momentum of the brick right before it hits the ground?

The momentum of a moving car is 300,000 kgms⁻¹. What would be the car’s new momentum if its velocity were doubled and its mass was tripled?

A trolley P of mass 2 kg moving with a velocity of 5 ms⁻¹ collided with a trolley Q of mass 5 kg moving with a velocity of 2 ms⁻¹ in the same direction. Find the momentum of the system after the collision.

Which of the following vehicles’ working principle is related to the Principle of Conservation of Momentum.

A lorry of mass 5000kg moved at a velocity of 40 ms⁻¹. The lorry then collided with a car of mass 1500kg at its back. The car was moving at a velocity of 35 ms⁻¹ before the collision. After the collision, both vehicles attached and moved at a velocity v. Find the value of v.