DIGITAL LESSONS > A-LEVEL DYNAMICS

# Dynamics

Explore the fundamental principles governing the motion of objects in this chapter. Through pre-recorded video lessons, mastery practices, and concise summary notes, you’ll grasp concepts like linear momentum, Newton’s Laws, impulse, and the fascinating world of interactions and explosions.

👨🏻🏫3 Lessons * 2 Hours/Week

💻14 Conceptual Videos & 50 Worked Example Videos

#### Conceptual Videos

#### Summary Notes

### Mastery Practices

**🟩Easy**

**Body A of mass 5.0 kg moves to the right with a velocity of 4.0 m s⁻¹. Body B of mass 3.0 kg moves to the left with a velocity of 8.0 m s⁻¹. Calculate (a) the momentum of A, (b) the momentum of B, (c) the total momentum of A and B.**

##### Video Explanation

Answer

**🟩Easy**

**A parachutist of mass 80 kg descends vertically at a constant velocity of 3.0 m s⁻¹.**

**What is the net force acting on him?**

##### Video Explanation

Answer

🟨**Medium**

**A marksman holds a rifle of mass M = 3.00 kg loosely in his hands, so as to let it recoil freely when fired. He fires a bullet of mass m = 5.00 g horizontally with a velocity of v_{B} = 300 m s⁻¹. What is the recoil velocity v_{R} of the rifle?**

##### Video Explanation

Answer

🟨**Medium**

**A projectile of mass m is fired with initial velocity u from a point P as shown below. The projectile lands with velocity v at angle θ to the ground.**

**Neglecting air resistance, in terms of m, v, and θ, determine the magnitude of the change in momentum of the mass between leaving P and entering Q is**

##### Video Explanation

Answer

**🟥Advance**

**An object A of mass 2.0 kg moves to the right along a frictionless surface at a speed of 40 m s⁻¹. It collides head-on with a 10 kg object B which is moving to the left at 4.0 m s⁻¹. After the collision A recoils and moves to the left at 30 m s⁻¹. Find final velocity of B.**

##### Video Explanation

Answer

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