Science · Lesson 2
Motion & Forces
Kinematics describes how things move. Dynamics explains why they move. Together, they form the foundation of classical mechanics — the physics of everyday objects from cars to planets.
Quick Check
1. A car starts from rest and accelerates at 3 m/s² for 4 seconds. What is its final velocity?
7 m/s
12 m/s
24 m/s
6 m/s
2. Newton's 2nd Law states:
Objects in motion stay in motion
F = ma
Every action has an equal and opposite reaction
Energy is conserved
3. An object in free fall near Earth accelerates at:
1 m/s²
9.8 m/s²
10 m/s
0 m/s² (constant velocity)
4. A 5 kg block is pushed with 20 N. Acceleration =?
100 m/s²
4 m/s²
0.25 m/s²
25 m/s²