Displacement-time and Velocity-time Graph of Ball Thrown Up / Ball Dropped

1) When a ball is thrown up and it comes down

When the ball leaves the hand, there is no upward force acting on the ball. The only force acting on the ball is its weight. This net force is opposite to the motion of the ball, hence causing the ball to decelerate.

2) When the ball is dropped and it re-bounces back (assume no energy lost)

When the ball is released, the only force acting on the ball is its own weight. This net force on the ball is in the direction of the motion, hence causing the ball to accelerate as it falls. Note that the acceleration due to gravity is assumed to be 10 ms-2, where air resistance is negligible.

3) When the ball is dropped and it re-bounces back (in reality with energy lost)

In reality, when the ball hits the ground, there will be some energy converted to heat and sound. So the ball will never return to its original height that it was released. So how will the graphs look like?

2024 Specimen Paper 6091 P1 Q30 Filament bulb graphs

When comes to filament lamp, the non-ohmic characteristic properties comes to mind. But for this quesitons, you have to understand that the p.d. across the lamp remains constant. Refer to the video for explanation.

Answer: Option: A

2020PPp1q9 moments – Find force P acting on stick by shoulder

Using the concepts that POM, we know 1) Ma = Mc

2) net force on the stick is 0N.

Most of us will most likely to take pivot about P as default, and find F, then P using the concept of net force = 0N.

But a body is in equilibrium, you can actually take pivot about any point in the body to do calculation based on Principle of Moments (POM). This method is especially using to find the answer for P straight away. The video below will guide you the normal and the short-cut.

Answer: Option D