1. What distance will you travel in 2.3 h at an average of 56 km/h?What do you know?t = ______ h; v = ______ km/h; d = ?What do you want to find out?How do you find out?d = vtd = ______ km/h x ______ hd = ______ kmI will travel ______ km over 2.3 h at an average of 56 km/h.

U4L5 – Solving For Distance

3. Sandra is having trouble with one of her assigned questions. She tosses her notebook to her friend Rahul for help. The book travels at 4 m/s and takes only 0.75 seconds to get to Rahul. How close are Sandra and Rahul sitting?

4. An alien (whose name cannot be spelled with our alphabet) is travelling from Alpha Centauri to our solar system, a distance of 39 732 000 000 000 km (39.732 x 1012 km). He makes this trip in just under three hours (2.8 h, to be exact). What is the speed of his spacecraft?

5. Light travelling from the Sun 1.44 x 108 km away reaches Earth in eight minutes. How fast is light travelling in km/s?

Stopping Distance Based on Velocity

Momentum

Momentum = mass x velocity

Question: What is the momentum of a football player with a mass of 90 kg who is running at 5 m/s?

A baseball player feels a frictional force of 400 N as she slides into home. What is the impulse if the slide lasts 0.5 seconds?

Impulse = force x time

What would the impulse be if the same slide lasted 2 seconds?

Problem: A sport utility vehicle with a mass of 2000 kg is travelling at 100 km/h. The driver brakes to avoid a small animal in the road. The velocity changes from 28 m/s (100 km/h) to 8 m/s (30 km/h) in only 2 seconds. What force does the vehicle experience?