Momentum and Impulse Review

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum
• Skater 2 experiences a greater change in momentum
• Skater 1 has a greater velocity than Skater 2
• Skater 1 experiences a greater force

A real car moving at 10 km/h has more momentum than a toy car moving at the same rate because ______.

• its mass is greater

• its mass is less

• it moves faster

• of friction

If an object with a mass of 12 kilograms is moving at 10 meters per second, what is its momentum?

• 120 kg*m/s

• 120 kg*m*s

• 1.2 kg*m/s

• 1.2 kg*m*s

2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

• Inelastic Collision

• Elastic Collision

• Perfectly Inelastic Collision

• No collision occurred

If a collision is elastic which of the following must be true?

• Momentum is not conserved

• The objects are in an open system

• The total momentum is equal to 0

• Kinetic Energy is conserved

If a collision is inelastic which of the following must be true?

• the total momentum of the system is conserved

• The total momentum of the system is not conserved

• The total momentum of the system is 0

• The total kinetic energy of the system is conserved

A dart with a mass of 0.5kg is thrown at 15m/s and sticks into a 1kg apple hanging on a string.  What is the velocity of the dart and apple just after the dart is embedded? 

• 0 m/s
• 5 m/s
• 10 m/s
• 15 m/s

A 3,000 kg truck moving at +10 m/s hits a 1,000 kg parked car which moves off at +15 m/s. What is the velocity of the truck?

• 10 m/s
• 0 m/s
• 5 m/s
• 2 m/s

A 2.5 kg ball moving at 4.2 m/s collides with a 2.5 kg stationary ball. If the first ball is at rest after the collision, what is the velocity of the second ball? 

• 2.1 m/s
• 2.5 m/s
• 4.2 m/s
• 8.4 m/s

An Elephant is running at a velocity of 14 m/s. He has a mass of 6,300 kg. What is the elephants momentum? Do not write units.

(a)