2.7-Impulse & Impulsive Force

Impulse is a __________________________

Impulsive force is the ______________________________ in a collision or impact in a short period of time

The symbol and unit for Impulse are

• J and N/s

• J and N s

• F and N

• W and N s

Which of the following situations does not require large impulse force?

• A baseball competition

• A karate expert breaking a piece of plank with his bare hands

• A high jumper jumping across the pole onto a thick mattress

• A mother pounding chillies with a pestle

A stationary hockey ball with a mass of 2 kg is given a horizontal impulse of 30.0 N s. What is the velocity of the ball after the impact?

• 10 m s^-1

• 12 m s^-1

• 15 m s^-1

• 18 m s^-1

A man applies a force of 15 N for 0.6 s when throwing a 0.4 kg stone. The impulse given to the stone is .................

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

• polystyrene packing

• mattress for a high jump event

• pestle and mortar

A hockey player uses a hockey stick to hit a hockey ball, causing the ball to travel with a velocity of 30 m s^-1. If the mass of the hockey ball is 100 g and the time of impact between the hockey stick and the ball is 5 x 10^-3 s, calculate the impulsive force exerted by the hockey ball.

• 600 N

• -600 N

• 600 000 N

• -600 000 N

Softer landings tend to

• increase impact force
• increase force
• increase collision time
• increase change in momentum

Tags

NGSS.HS-PS2-3

Impulse can be determined by calculating the area under graph of

• force (f) - time (t) graph

• impulse (J) - time (t) graph

• momentum (p) - time( t) graph

• velocity (v) - time (t) graph