Recap - Braking Car

Part of the Mechanics section of Coddy's Physics journey. Lesson 31 of 97.

Challenge

A car drives along a straight road at $20\ \mathrm{m/s}$ when the light turns red. It brakes with a constant acceleration and stops exactly $25\ \mathrm{m}$ later. Taking the way the car drives as positive, find its acceleration $a$ .

Try it yourself

Physics diagram: cart; arrows v 0 = 20 m/s, a = ?

Solve for $a$

All lessons in Mechanics

1Introduction

What is Physics?Your First Equation Turning a Rule Around

4Inclined Planes

Forces on an Incline Gravity Components Frictionless Incline Incline with Friction Will It Slide?Recap - Ramp Challenge

7Projectile Motion

Independent Axes Horizontal Launch Launch at an Angle Range and Max Height Recap - Hit the Target

10Work and Energy

Work Kinetic Energy Work-Energy Theorem Gravitational PE Conservation of Energy Power Recap - Roller Coaster

13Impulse and Momentum

Momentum Impulse Conservation of Momentum Elastic Collisions Inelastic Collisions Recap - Air Track

16Simple Harmonic Motion

What is SHM?Mass on a Spring The Pendulum SHM Graphs Energy in SHM Recap - Oscillator

2Vectors and Newton's Laws

Right Triangles What is a Vector?Adding Vectors Axes and Directions Vector Components Forces Around Us Friction and Tension Newton's First Law Newton's Second Law Newton's Third Law Recap - Net Force

5Kinematics in 1D

Position and Displacement Velocity Acceleration Motion Graphs Equations of MotionRecap - Braking Car

8Kinematics and Newton

From Forces to Motion From Motion to Forces Two-Stage Motion Recap - Elevator

11Springs

Hooke's Law Springs in Series Springs in Parallel Recap - Spring Scale

14Momentum in 2D

Momentum as a Vector 2D Collisions Explosions Recap - Billiards

17Gravitation

Law of Gravitation Gravity and Altitude Satellites Kepler's Laws Gravitational Energy Escape Velocity Satellite Energy Recap - Mission to Orbit

3Friction

What is Friction?Static Friction Kinetic Friction Friction and Newton's Laws Recap - Sliding Crate

6Vertical Motion

Free Fall Throwing Upward Time in the Air Recap - Dropped Ball

9Project: Delivery Drone

Mission Briefing Takeoff Thrust Climb to Altitude Cruise and Brake Package Drop

12Elastic Energy

Elastic Potential Energy Spring Launchers Energy with Springs Recap - Spring Launcher

15Circular Motion

Uniform Circular Motion Centripetal Acceleration Horizontal Circles Vertical Circles Loop the Loop Recap - Car on a Curve

18Final Challenges

Recap - Stunt Ramp Recap - Crash Test Recap - Space Probe