The symbol and unit for Impulse are

• J and N/s

• J and N s

• F and N

• W and N s

impulsive force is

• the change in velocity

• the rate of change in momentum

• the change in acceleration

• the rate of change in inertia

impulse is

• the change in momentum

• the rate of change in momentum

• the rate of force acting

• the change in inertia

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

• smaller

• the same

which of the following will reduce impulsive force

• increase in velocity

• increase in mass

• increase in time

• increase in acceleration

which of the following causes increase in impulsive force?

• a long jumper landing on a sandy pit

• an airbag acting on a driver during an accident

• a softball player wearing a thick and soft glove to catch a ball

• a boy jumping down with straightened legs.

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N·s

• 6 N·s

• 66 N·s

• None of these

Tags

NGSS.HS-PS2-1

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N·s.

• -2.5

  .

  .

• -10

• -18

• -45

Tags

NGSS.HS-PS2-1

Definition of impulse:

• The time integral of net force that causes Change in momentum

• The product of mass and velocity

• The ability to do work

• the rate of increase of speed or the rate of change of velocity

Tags

NGSS.HS-PS2-2

All of the following are examples of impulse except..

• A car moving with constant speed

• A tennis ball hitting a racket

• A pencil getting stuck to the ceiling

• A hammer bouncing of a nail

Tags

NGSS.HS-PS2-2