Momentum Practice

A 1.0 kg lump of clay is sliding to the right on a frictionless surface with speed 2 m/s . It collides head-on and sticks to a 0.5 kg metal sphere that is sliding to the left with speed 4 m/s . What is the kinetic energy of the combined objects after the collision?

• 6 J

• 4 J

• 2 J

• 0 J

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NGSS.HS-PS2-2

A 12 kg box sliding on a horizontal floor has an initial speed of 4.0 m/s. The coefficient of friction between the box and the floor is 0.20. The box moves a distance of 4.0 m in 2.0 s. The magnitude of the change in momentum of the box during this time is most nearly

• 12 kg m/s

• 48 kg m/s

• 60 kg m/s

• 96 kg m/s

Tags

NGSS.HS-PS2-1

A ball of mass 0.4 kg is initially at rest on the ground. It is kicked and leaves the kicker's foot with a speed of 5.0 m/s in a direction 60° above the horizontal. The magnitude of the impulse imparted by the ball to the foot is most nearly

• 1 Ns

• 2 Ns

• $\frac{2}{\sqrt{3}}$ Ns

Tags

NGSS.HS-PS2-1

• Only conservation of momentum, because the momentum lost by one cart is gained by the other and there is only one unknown quantity.

• Both conservation of mechanical energy and conservation of momentum, because both principles apply in any collision

• Both conservation of mechanical energy and conservation of momentum, because neither cart changes direction.

• Either conservation of momentum or conservation of mechanical energy, because only one equation is required to solve for the one unknown variable

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NGSS.HS-PS2-2

A dog of mass 10 kg sits on a skateboard of mass 2 kg that is initially traveling south at 2 m/s. The dog jumps off with a velocity of 1 m/s north relative to the ground. Which of the following is the best estimate of the velocity of the skateboard immediately after the dog has jumped?

• 1 m/s north

• 3 m/s south

• 7 m/s south

• 17 m/s south

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NGSS.HS-PS2-2

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NGSS.HS-PS2-2

• Momentum and Kinetic energy are conserved

• Only momentum is conserved

• Only Kinetic Energy is conserved

• Neither are conserved

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NGSS.HS-PS2-2

• The system containing block X is an open system, and the system of both blocks is an open system.

• The system containing block X is an open system, and the system of both blocks is a closed system.

• The system containing block X is a closed system, and the system of both blocks is an open system.

• The system containing block X is a closed system, and the system of both blocks is a closed system.

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NGSS.HS-PS2-2

Two identical spaceships are traveling in deep space, far from any planets or stars. The ships travel in the same direction, with the slower one directly behind the faster one. The ships are connected by a cable attached to a spool, so that the part of the cable outside the ships can be made longer or shorter as needed. The cable is used to bring the ships to the same speed for a transfer of cargo. The graph above shows the speed of the two ships during a 10 s interval.

Does at least one of the ships have its engine turned on during the time interval shown, and what evidence indicates so?

• Yes, because Ship 2 is speeding up.

• Yes, because the momentum of the two-rocket system increases.

• Yes, because an engine is needed to keep the system moving

• No, because the cable alone could be responsible for making Ship 1 slow down and Ship 2 speed up.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

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NGSS.HS-PS2-2