Browse Momentum

1. 1
   A ball of mass $0.2\text{ kg}$ moving at $6\text{ m s}^{-1}$ strikes a wall at right angles and rebounds along the same line at $4\text{ m s}^{-1}$. Taking the ball's initial direction as positive, find its change in momentum. (3 marks)
   Level 3 · 3 marksTry it→
2. 2
   Particle $A$ (mass $2\text{ kg}$) moves at $5\text{ m s}^{-1}$. Particle $B$ (mass $4\text{ kg}$) moves along the same line in the opposite direction at $v\text{ m s}^{-1}$. The total momentum of the two particles is zero. Find $v$. (3 marks)
   Level 3 · 3 marksTry it→
3. 3
   A cricket ball of mass $0.15\text{ kg}$ travelling at $20\text{ m s}^{-1}$ is caught and brought to rest.
   
   Find the magnitude of the change in momentum of the ball. (3 marks)
   Level 3 · 3 marksTry it→

All 16 linear momentum questions →

1. 1
   Two particles, $P$ and $Q$, of masses $3m$ and $4m$ respectively, move on a smooth horizontal surface. They travel along a straight line towards each other, $P$ at speed $5u$ and $Q$ at speed $2u$, and collide directly.
   
   The collision reverses the direction of motion of both particles. Immediately after the collision, the speed of $P$ is $v$ and $Q$ is moving twice as fast as $P$.
   (a) Show that $v = \dfrac{7}{5}u$
   
   (3 marks)
   (b) Find, in terms of $m$ and $u$, the magnitude of the impulse that $P$ exerts on $Q$ in the collision.
   
   (3 marks)
   Level 3 · 6 marksTry it→
2. 2
   Two particles move towards each other along the same straight line. $P$ (mass $5\text{ kg}$) moves at $4\text{ m s}^{-1}$ and $Q$ (mass $3\text{ kg}$) moves at $6\text{ m s}^{-1}$. They collide and coalesce. Find the speed and direction of the combined particle. (4 marks)
   Level 3 · 4 marksTry it→
3. 3
   A particle $A$ of mass $2\text{ kg}$ moving at $8\text{ m s}^{-1}$ collides directly with a stationary particle $B$ of mass $6\text{ kg}$. After the collision $B$ moves in $A$'s original direction at $3\text{ m s}^{-1}$. Find the velocity of $A$ after the collision, and state whether $A$ has reversed its direction. (4 marks)
   Level 3 · 4 marksTry it→

All 19 conservation of linear momentum questions →