P5.13 Force and acceleration

What is the main objective when investigating force and acceleration?

• To measure the mass of an object.

• To determine how the acceleration of an object changes with varying force.

• To calculate the velocity of an object.

According to Newton's second law, what is the relationship between the acceleration of an object and the resultant force acting on it?

• Acceleration is inversely proportional to the resultant force.

• Acceleration is directly proportional to the resultant force.

• Acceleration is unrelated to the resultant force.

What instrument is commonly used to measure the velocity of a trolley in an investigation?

• A spring balance.

• A motion sensor.

• A stopwatch.

If an object is slowing down or decelerating, what is the direction of the resultant force?

• It is in the same direction as the object's velocity.

• It is in the opposite direction to the object's velocity.

• It is perpendicular to the object's velocity.

What is inertia?

• The tendency of an object to speed up.

• The tendency of an object to resist any change in its state of motion.

• The force that causes an object to move.

How can you calculate the resultant force on an object from its acceleration and mass?

• Resultant force = mass × acceleration.

• Resultant force = mass ÷ acceleration.

• Resultant force = acceleration ÷ mass.

What does the gradient of a velocity-time graph for a trolley represent in an investigation of force and acceleration?

• The distance traveled by the trolley.

• The acceleration of the trolley.

• The total time taken for the trolley to move.

If a trolley is accelerating, what can be expected to happen to the acceleration if more trolleys are added, assuming the resultant force remains constant?

• The acceleration will increase.

• The acceleration will decrease.

• The acceleration will stay the same.

What is the unit for resultant force, mass, and acceleration respectively in the equation linking them?

• Newtons (N), kilograms (kg), meters per second (m/s).

• Newtons (N), grams (g), meters per second squared (m/s²).

• Newtons (N), kilograms (kg), meters per second squared (m/s²).

What safety precaution should be taken when performing experiments with falling trolleys?

• Ensure the trolley is heavy enough.

• Protect your bench and feet from falling trolleys.

• Use a frictionless surface.