linear momentum and collision

A simple pendulum is formed of a solid (S1), of mass, $m_1=200g$ suspended from the end of a light and inextensible string of length. The other end of the string is fixed to a support.
The pendulum is shifted by an angle $\theta=30^{\degree}$ from its equilibrium position and released from rest. The string is still stretched.
The horizontal plane passing through O is taken as a gravitational potential energy reference.
Neglect friction and take g=10m.s-2.

determine the speed of (S1) at O.

• $4\ m.s^{-1}$

• $5\ m.s^{-1}$

• $6m.s^{-1}$

• $3m.s^{-1}$

Tags

NGSS.HS-PS2-1

   At the instant t0 =0s, (S2) leaves the horizontal plane at a point B with velocity $\overrightarrow{v'_2}=2\overrightarrow{i}$  . Thus, (S2) describes a parabolic trajectory in the space reference system  and hits the ground level at a point D at a height 2m below B.
1-    Apply Newton's second law on (S2) to determine  at an instant t, the horizontal and the vertical components of the linear momentum of (S2) .
.

•  $p_x=1.2\ and\ \ p_y=6t\ \ \ \ \ \ \ \left(kg\ m.s^{-1}\right)$  

•  $p_x=2.5\ and\ p_{y\ }=5t\ \ \ \ \left(kg\ m.s^{-1}\right)$  

•  $p_x=4.6\ \ and\ p_y=12t\ \ \ \left(kgm.s^{-1}\right)$  

•  $p_x=8\ and\ p_y=7t\ \ \left(kgm.s^{-1}\right)$  

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

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

Tags

NGSS.HS-PS2-2

A BMW rear ends a car at the stop light. Neither car sticks together. The momentum was conserved in the collision but the kinetic energy was not conserved. What type of collision is this?

• Elastic Collision

• Inelastic Collision

• Perfectly inelastic Collision

• No Collision

Tags

NGSS.HS-PS2-2

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

Tags

NGSS.HS-PS2-2

What is the the total momentum of the red and blue ball before the collision?

• 16 kg m/s
• 32 kg m/s
• 2 kg m/s
• 6 kg m/s

Tags

NGSS.HS-PS2-2

A 0.20 kg ball is thrown at batter at a speed of 140 km/h. What is the momentum of the ball?

• 28 kg m/s

• 7.8 kg m/s

• 150 kg m/s

• 150 Joules

Tags

NGSS.HS-PS2-2

Collisions where objects BOUNCE apart.

• inelastic collisions

• elastic collisions

• explosions

• none of these

Tags

NGSS.HS-PS2-2

Two Pool Balls collide and then go separate directions.

• inelastic collision

• elastic collision

• explosion

• none of these

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2