IMPULSIVE FORCE

Impulsive force is

• the change in velocity

• the rate of change in momentum

• the change in acceleration

• the rate of change in inertia

Which of the following will reduce the impulsive force?

• increase in velocity

• increase in time

• increase in mass

• increase in acceleration

A boy bending his knees when jumping down from a fence. The boy bends his knee so that the impact of the impulsive force on his leg will be

• bigger

• the same

• smaller

The following materials can reduce impulsive force.....

• polystyrene packing

• mattress for a high jump event

• pestle and mortar

During a collision, an object experiences an impulse. The impulse causes and is equal to the _____ of the object

• momentum change

• energy change

• force

• kinetic energy change

A softball player moves his hand backwards while catching a fast-moving ball. This movement of hand is to

• increase the impulsive force

• control the ball to stop it falling

• lengthen the stopping time of the ball

10. Which is false about impulse?

• A. Unit is Ns

• B. Change in momentum

• C. Product of impulsive force and time interval

• D. Scalar quantity

During a collision, an object experiences an impulse. How can this impulse be calculated?

• Multiplying force by time

• Multiplying mass by velocity

• Dividing velocity by time

• Multiplying mass by acceleration

Which of the following is NOT true?

• Follow through increase the velocity of the ball

• Follow through increase the change of momentum

• Follow through increase the impulsive force

• Follow through increase the impulse

Safety devices such and air bags and crumple zones protect passengers in a car by

• increasing the stopping time so that force is decreased

• decreasing the stopping time so that force in increase

• reducing the change in momentum to zero

• reducing the impulse