Browse Momentum

1. 1
   Two particles move along the same straight line. $P$ has mass $3\text{ kg}$ and moves at $4\text{ m s}^{-1}$; $Q$ has mass $5\text{ kg}$ and moves at $2\text{ m s}^{-1}$ in the opposite direction. Taking $P$'s direction as positive, find the total momentum of the two particles. (3 marks)
   Level 2 · 3 marksTry it→
2. 2
   A particle has momentum of magnitude $7.5\text{ kg m s}^{-1}$ when it moves at $3\text{ m s}^{-1}$.
   (a) Find its mass. (1 mark)
   (b) Find its speed when its momentum has magnitude $12.5\text{ kg m s}^{-1}$. (2 marks)
   Level 2 · 3 marksTry it→
3. 3
   (a) State the SI units of momentum. (1 mark)
   (b) Particle $X$ has mass $4\text{ kg}$ and speed $3\text{ m s}^{-1}$; particle $Y$ has mass $2\text{ kg}$ and speed $7\text{ m s}^{-1}$, moving in the same direction. Determine which particle has the greater momentum, and by how much. (2 marks)
   Level 2 · 3 marksTry it→

All 16 linear momentum questions →

1. 1
   A light inextensible string has particle $P$, of mass $5m$, attached to one end and particle $Q$, of mass $3m$, attached to the other. The particles are on a smooth horizontal table, and the string is slack.
   
   $P$ is at rest and $Q$ is sliding across the table, directly away from $P$, with speed $8u$. When the string becomes taut, $P$ is jerked into motion, and from then on the two particles move with a common speed.
   (a) Find, in terms of $u$, the speed of $P$ immediately after the string becomes taut.
   
   (2 marks)
   (b) Find the magnitude of the impulse that the string exerts on $Q$ as it becomes taut, giving your answer in terms of $m$ and $u$.
   
   (3 marks)
   Level 2 · 5 marksTry it→
2. 2
   A particle $A$ of mass $4\text{ kg}$ moving at $5\text{ m s}^{-1}$ collides directly with a stationary particle $B$ of mass $2\text{ kg}$. After the collision $A$ continues in the same direction at $2\text{ m s}^{-1}$. Find the speed of $B$ after the collision. (3 marks)
   Level 2 · 3 marksTry it→
3. 3
   A truck of mass $2000\text{ kg}$ moving at $6\text{ m s}^{-1}$ collides with a stationary truck of mass $1000\text{ kg}$. The trucks couple together on impact. Find their common speed after coupling. (3 marks)
   Level 2 · 3 marksTry it→

All 19 conservation of linear momentum questions →