Page 73 - text book form physics kssm 2020

Bab 2
Chapter 2 Daya dan Gerakan Iorce and Motion I
F
2.7 Impulse and Impulsive Force

Photograph 2.8 shows the action of a long jump athlete
bending his legs while landing. What is the effect of
this action?
The action of bending his legs is to reduce the
magnitude of the impulsive force acting on his body.
Impulse is a change of momentum.

Impulse, J = mv – mu
= Ft
F = applied force
t = time of action of the force Photograph 2.8 Long jump athlete bending
his legs
Impulsive force is the rate of change of momentum in a collision or impact in a short
period of time. The formula for impulsive force is as follows.

mv – mu
Impulsive force, F =
t
t = impact time
mv – mu = change of momentum

1
If change of momentum, mv – mu is constant, then F ∝ . If t is small, then the
magnitude of F is big or vice versa. t

Activity 2.14 ISS ICS

Aim: To discuss impulse and impulsive force
Instructions: Video on impulse, momentum
1. Work in groups. and impulsive force
2. Gather the following information from appropriate
websites.
(a) effect of follow through action on magnitude of
impulse.
(b) situations and applications in daily life that involve http://bt.sasbadi.com/p4067
impulse.
(c) situations and applications in daily life that involve impulsive force, including safety
features in vehicles.
3. Prepare a brief multimedia presentation and present it.

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2.7.1 67
2.7.1