Physics Momentum and Impulse Quiz 2/03/23

Please rate yourself on a scale of 1-5 how you're feeling in class this unit far, with a 1 being totally lost, a 3 feeling relatively confident, and a 5 being "this stuff is too easy"

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• 2
• 3
• 4
• 5

Find the momentum of a 12 kg object moving at - 4.5 m/s.

• I don't know
• 2.7 kgm/s
• -2.7 kgm/s
• 54 kgm/s
• -54 kgm/s

Find the time it will take for a 6 N force to disperse 90 kgm/s of momentum

• I don't know
• 12 s
• 15 s
• 540 s
• .54 s

A 200kg car is moving at a velocity of 12 m/s when the driver slams on the brakes. That car comes to a complete stop in 4 seconds. What is the force of friction applied by the brakes?

• -600 N
• I don't know
• 600 N
• 2400 N
• -2400N

A 4 kg object moving 7 m/s slams into a 8 kg object at rest. After the elastic collision, the 8 kg object moves at 2 m/s. What is the velocity of the 4kg object?

• 3 m/s
• I don't know
• 28 m/s
• -28 m/s
• 32 m/s

A 4 kg object moving at +11 m/s and a 7 kg object moving at -3 m/s have a head-on inelastic collision. The two move off with what final velocity after the impact? round to the nearest whole number

• 2 m/s
• I don't know
• 6 m/s
• -6 m/s
• 88 m/s

Three objects, named A, B, and C, are all 5 kg. They all slam together in an INELASTIC collision and move off together. Before the collision, object A is moving at 8 m/s, object B is moving at 7 m/s, and object C is moving at -5 m/s. If after the collision, the objects have a speed of 2 m/s, what was the momentum change (delta p) caused by forces?

• -20kgm/s
• I don't know
• +10 kgm/s
• -10 kgm/s
• +20 kgm/s

Let's say another 3 objects are involved in another collision, this time an elastic one. Before the collision, object A (weighing 1 kg) is moving at a velocity of 2 m/s. Object B (weighing 2 kg) is moving at a velocity of 5 m/s. Object C (weighing 3 kg) is moving at a velocity of -8 m/s. After the collision, Object A moves at 4 m/s, object B moves at -12 m/s, and object C moves at -14 m/s. If the three objects are in contact for 0.2 seconds, what is the total force acting on the objects during the collision?

• -250 N
• I don't know
• + 50 N
• - 50 N
• +10 N

Object A (5 kg) comes in at a 45 degree angle east of north with a velocity of 12 m/s and bumps into object B (4 kg) which is stationary. After the collision, Object B moves at a 10 degree angle east of north with a velocity of 14 m/s. What is the X and Y component of object A's final momentum? (round both to the nearest whole number)

• X= -13, Y=33
• I don't know
• X= 13, Y=-33
• X=43, Y= 10
• X=-43, Y=-10