Linear Momentum

Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:

• 2 m/s 
• 3.4 m/s 
• 4.6 m/s 
• 7.1 m/s

Tags

NGSS.HS-PS2-2

A 5000 kg freight car moving at 4 km/hr collides and couples with an 8000 kg freight car which is initially at rest. The approximate common final speed of these two cars is

• 1 km/h 
• 1.3 km/h 
• 1.5 km/h 
• 2.5 km/h

Tags

NGSS.HS-PS2-2

Two pucks are firmly attached by a stretched spring and are held at rest on a frictionless surface. They are released simultaneously. If puck I has 3X the mass of puck II, which of the quantities is the same for both as the spring pulls the two pucks?

• Speed 
• Magnitude of acceleration 
• Kinetic energy 
• Magnitude of momentum

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The definition of momentum is

• Mass in Motion
• The size of an object
• The velocity of an object
• A comparison between two objects

Tags

NGSS.HS-PS2-2

The equation to calculate momentum is

• p=mv
• p=1/2mv²
• p=mgh
• p=mg

Tags

NGSS.HS-PS2-2

The total momentum does not change unless outside forces (external impulses) act on the objects.

• True
• False

Tags

NGSS.HS-PS2-2

A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?

• 25 m/s
• 375 m/s
• 25 kg m/s
• 375 kg m/s

Tags

NGSS.HS-PS2-2

A 0.5 kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s.  The time the ball is in contact with the ball is 0.01 s.  Calculate the force acting on the ball by the wall during the collision.  F = ______ N  (magnitude only, positive or negative doesn't matter)

• 0.14
• 150
• 350
• 500

Tags

NGSS.HS-PS2-1

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s.  The time for the collision is _____ seconds.

• 1.8
  .
  .
• 2.5
• 3.6
• 10

Tags

NGSS.HS-PS2-1

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s.  The impulse on the ball is  ______ N s.

• -2.5
  .
  .
• -10
• -18
• -45

Tags

NGSS.HS-PS2-1