AQA PE Quiz: Laws and Summation

Which of the following best describes Newton's First Law of Motion?

• An object will remain at rest or in uniform motion unless acted upon by an external force.

• The acceleration of an object is directly proportional to the net force acting on it.

• For every action, there is an equal and opposite reaction.

• The force of gravity acts on all objects with mass.

What is a key factor affecting the stability of an object?

• The colour of the object.

• The mass of the object.

• The height of the object's centre of mass.

• The temperature of the environment.

Which characteristic is true of Type I muscle fibres?

• They are fast-twitch fibres.

• They fatigue quickly.

• They are suited for endurance activities.

• They generate high force.

What is wave summation in muscle contraction?

• The process of recruiting more motor units to increase force.

• The increase in muscle contraction strength due to repeated stimulation.

• The relaxation of muscles after contraction.

• The decrease in muscle contraction strength over time.

What does spatial summation refer to in muscle physiology?

• The increase in contraction strength by increasing the frequency of stimulation.

• The recruitment of additional motor units to increase force.

• The relaxation of muscles after contraction.

• The decrease in muscle contraction strength over time.

According to Newton's Third Law, what happens when one object exerts a force on another object?

• The second object exerts a force of equal magnitude in the same direction.

• The second object exerts a force of equal magnitude in the opposite direction.

• The second object exerts a force of greater magnitude in the opposite direction.

• The second object exerts no force in return.

Type I muscle fibres are also known as:

• Fast oxidative fibres.

• Slow oxidative fibres.

• Fast glycolytic fibres.

• Slow glycolytic fibres.

What is the primary benefit of wave summation in muscle contraction?

• It allows for muscle relaxation.

• It increases the speed of muscle contraction.

• It increases the force of muscle contraction.

• It decreases the energy consumption of muscles.

In spatial summation, how is the force of muscle contraction increased?

• By increasing the frequency of nerve impulses.

• By decreasing the number of active motor units.

• By increasing the number of active motor units.

• By decreasing the frequency of nerve impulses.

Newton's First Law is also known as the law of:

• Acceleration.

• Inertia.

• Action and Reaction.

• Gravity.