Changes in Motion

Describing motion in one dimension, and conservation of momentum in collisions.

11 questions, free, marked as you go with a worked explanation on every one.

What this covers

A car speeds up from 10.0 m/s to 30.0 m/s in 4.0 s. What is its average acceleration?
What is the momentum of a 60.0 kg runner moving at 4.0 m/s?
A 1200 kg car at 20.0 m/s hits a stationary 800 kg car and they lock together. What is their speed afterwards?
What is displacement?
Why does a longer collision time reduce the force on a passenger?
Which statements about momentum are correct? Select all that apply.
A cyclist riding along a river path at 8.0 m/s brakes at a constant 2.0 m/s² until coming to a complete stop. How far does the bike travel while braking?
A position-time graph for a moving object is a straight line with a constant positive slope. What does this tell you about the object's motion?
A 2 kg object speeds up from 3 m/s to 8 m/s. Find the impulse applied to it.
A 5 kg object moving at 4 m/s collides with and sticks to a stationary 3 kg object. Find their common velocity after the collision.
Two skaters start from rest and push off each other. One has a mass of 60 kg and moves away at 3 m/s. If the other has a mass of 90 kg, find that skater's speed.