AQA Past Paper 2F 2020

1.1 Figure 1 shows a girl bowling a ball along a ten-pin bowling lane. The girl is trying to knock down the ten pins at the end of the bowling lane. As the ball travels along the lane the velocity of the ball decreases. Velocity is a vector. Which statement describes a vector?

• Vectors have direction only.

• Vectors have magnitude and direction.

• Vectors have magnitude only.

1.2 Why does the velocity of the ball decrease as the ball travels along the lane?

• The force of gravity slows the ball down.

• There are no forces acting on the ball.

• There is a resultant force acting on the ball.

1.3 The ball travels along the lane at an average speed of 4.5 m/s It takes the ball 4.0 seconds to travel the length of the lane. Calculate the length of the lane. Use the equation:

distance travelled = speed × time

1.4 Figure 2 shows the ball hitting one of the pins. Draw an arrow on Figure 2 to show the force of the pin on the ball.

1.5 The velocity of the pin changes from 0 to 12 m/s It takes 0.15 seconds for the velocity to change. Calculate the acceleration of the pin. Use the equation:

acceleration = change in velocity/time taken

1.6 When the pin is struck it accelerates. Complete the sentences. Choose answers from the box. Each answer can be used once, more than once, or not at all.

The displacement of the pin from the girl _____________.

The mass of the pin ______________________.
The kinetic energy of the pin ____________.

2.1 Figure 3 shows a computer keyboard. box There is a spring under each key. Why do the keys have springs under them?

• Springs make the keys easier to press.

• Springs make the keys lighter.

• Springs push the keys back to their original position.

2.2 Why does every spring used in the keyboard have the same spring constant?

• So that more than one key can be pressed at the same time.

• So that the same force is needed to press each key.

• So that the springs are all the same length.

2.3 Figure 4 shows one of the keys and its spring. What happens to the length of the spring when the key is pressed?

2.4 How far must the key move before it touches the switch?

• 4.0 mm

• 4.0 cm