Impulse and Momentum Unit Review

Ava launches a model rocket from the ground. The rocket has a mass of 1.5 kg. If the rocket starts from rest, and reaches a velocity of 35 m/s in 1.6 seconds, what amount of force was the engine exerting on the model rocket?

• 32.8 N

• 42.4 N

• 28.3 N

• 84.1 N

Joy pushes Eve, and exerts an impulse of 800 N x s on her. If Eve has a mass of 55 kg, and she was moving with a velocity of -2 m/s before being pushed, what is Eve’s velocity after being pushed?

• 9.8 m/s

• 12.5 m/s

• 15.3 m/s

• 13.9 m/s

Kayla is driving an 18 wheeler truck. The truck’s engine exerts a force of 1400 N for 4 seconds on the truck, which starts at a velocity of 7 m/s and ends at a velocity of 14 m/s. What is the mass of the 18 wheeler?

• 900 kg

• 726 kg

• 800 kg

• 850 kg

Chris pushes on a box, which has a mass of 5 kg, with a force of 20 N for 4 seconds.

a) What is the change in momentum of the box?

b) If the box started from rest, what is the box’s final velocity?

• a) 5 kg x m/s b) 1 m/s

• a) 30 kg x m/s b) 6 m/s

• a) 24 kg x m/s b) 4.8 m/s

• a) 80 kg x m/s b) 16 m/s

Alex kicks a soccer ball that is sitting on the ground at rest. If the ball has a mass of 4 kg, and its velocity after being kicked is -3 m/s:

a) What is the impulse exerted by Alex on the ball?

b) If Alex kicked the ball with a force of 50 N, how long was her foot in contact with the ball?

• a) -12 N x s b) 0.45 sec.

• a) 12 N x s b) 0.78 sec.

• a) -12 N x s b) 0.24 sec.

• a) 12 N x s b) 0.67 sec.

Natalie and Gina are standing on a frozen lake together. Natalie has a mass of 56 kg, and Gina has a mass of 52 kg. Natalie pushes Gina to the right, giving Gina a velocity of 2 m/s. What velocity does Natalie have after pushing Gina?

• 1.9 m/s

• -1.9 m/s

• -4.2 m/s

• 2.3 m/s

Emily is standing on a frozen lake, carrying a ball. She has a mass of 53 kg, and the ball has a mass of 1.3 kg. If Emily throws the ball to the right with a velocity of 23 m/s, what will her velocity be after she throws the ball?

• -1.1 m/s

• -0.8 m/s

• -0.6 m/s

• -0.3 m/s

On a frozen lake, Henry pushes a random person. Henry has a mass of 55 kg, and he pushes the person to the left, giving the person a velocity of -5 m/s. If Henry’s velocity after pushing the person is 8 m/s, what is the random person’s mass?

• 60 kg

• 74 kg

• 53 kg

• 88 kg

On a frozen lake, Aidan pushes a random person. Aidan has a mass of 55 kg, and he pushes the person to the right, giving the person a velocity of 3 m/s. If that person’s momentum after being pushed is 300 kg x m/s, what is Aidan’s velocity after pushing the random person?

• -5.5 m/s

• -2.9 m/s

• -3.4 m/s

• -1.4 m/s

Rania and Frantzisca tackle each other, and stick together after they collide. Rania has a mass of 52 kg, and Frantzisca has a mass of 54 kg. Before they collide, Frantzisca has a velocity of -3 m/s, and Rania has a velocity of -7 m/s. What is their velocity after they collide?

• -2.78 m/s

• -5.82 m/s

• -3.23 m/s

• -4.96 m/s