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Year 11 Biomechanics Quiz

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Year 11 Biomechanics Quiz

Answer every question. Show your working for calculations and include units where appropriate.

Part A: Multiple choice

Choose the best answer for each question.

1.A swimmer pushes water backwards with their hands and moves forwards. Which of Newton’s laws best explains this?

Newton’s first law: inertia
Newton’s second law: force and acceleration
Newton’s third law: action and reaction
The law of universal gravitation

2.In biomechanics, what does an object’s centre of mass represent?

The point where the object is widest
The point at which its mass can be considered concentrated
The location of its heaviest individual part
The point where gravity stops acting

3.During a biceps curl, the elbow acts as the fulcrum, the biceps applies effort to the forearm, and the load is in the hand. Which lever class is this?

First class
Second class
Third class
Fourth class

4.A 60 kg runner increases their speed from 4 m/s to 8 m/s. What happens to their momentum?

It stays the same
It doubles
It halves
It becomes four times greater

5.Which change would generally make a person more stable while standing?

Narrowing the base formed by their feet
Raising their centre of mass
Widening their base of support
Moving their centre of mass beyond their base

6.A ball travels through the air with negligible air resistance. What happens to its horizontal velocity?

It steadily increases
It steadily decreases
It remains constant
It becomes zero at the highest point

7.What is torque in the context of a force acting on a body or object?

The turning effect produced by a force
The speed at which an object moves in a straight line
The resistance of an object to a change in motion
The total mass of a moving object

8.A volleyball player pushes off the floor to jump upwards. Which sequence best describes the energy changes in the player’s body and movement?

Chemical energy to kinetic energy, then to gravitational potential energy
Gravitational potential energy to chemical energy, then to thermal energy
Kinetic energy to chemical energy, then to sound energy
Thermal energy to gravitational potential energy, then to chemical energy

Part B: Short answers and calculations

Show working for calculations. Use appropriate units.

9.A 65 kg football player runs at 7 m/s. Calculate the player’s momentum.

10.A 0.20 kg hockey ball is initially at rest. A stick accelerates it to 25 m/s. Calculate the impulse delivered to the ball.

11.Explain how the pattern on the sole of a running shoe can help an athlete change direction without slipping. Use the term friction.

12.A dancer changes from standing with feet close together to standing with feet well apart. Explain how this change affects stability.

13.Name two phases of the walking gait cycle and describe what happens during each phase.

14.A diver steps from a platform above a swimming pool and falls towards the water. Describe how the diver’s gravitational potential energy and kinetic energy change during the fall.

15.When a cyclist rounds a bend, they lean their body and bicycle towards the inside of the turn. Explain why this helps them turn safely.

16.A rower applies a perpendicular force of 250 N to an oar at a point 0.6 m from its pivot. Calculate the torque about the pivot.