Figure 1.1 shows a student holding a rubber ball 1.4 m above a hard floor. The mass of the ball is 0.18 kg. State what is meant by the mass of the ball.

a student standing on a hard floor holding a rubber ball at arm's length, with the 1.4 m height from the ball down to the floor arrowed

1(b)(i)Forces Free Body DiagramsEasy1 mark

The student releases the ball. The ball accelerates downwards due to a force W. State the name of force W.

1(b)(ii)Forces Free Body DiagramsEasy2 marks

Calculate W. State the equation you use.

Equation

1(b)(iii)Energy Work Power EfficiencyEasy2 marks

The ball falls 1.4 m. Energy is transferred from the gravitational potential energy store of the ball. Show that the energy transferred is 2.5 J.

Answer

0 words

1(b)(iv)Energy Work Power EfficiencyMedium3 marks

The energy in 1(b)(iii) is all transferred to the kinetic energy store of the ball. Calculate the velocity of the ball.

1(c)Scalars VectorsMedium1 mark

The ball hits the floor and moves upwards. The magnitude of the velocity is less than the value calculated in 1(b)(iv). State one other way the velocity of the ball is different from the velocity calculated in 1(b)(iv).