# Markowski Motion, Forces & Energy

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### acceleration

to change the speed or direction

### force

gives energy to an object; a push or pull

### gravity

the force of attraction that exists between all objects in the universe

### friction

force that opposes the motion of an object

### weight

mass times gravity
m x g

### speed

distance divided by time
d / t

### Law of conservation of mass

mass remains constant over time

acceleration

gravity

friction

force

### an airplane travels 215 miles in 20 minutes. How many miles per minute does it travel?

215 / 20 = 10.75 miles per minute

### Newton

unit of measurement for weight

### a person has a mass of 68 kg. What is his weight on Earth? *Gravity on Earth is 9.8 m/s2

68 x 9.8 = 666.4 Newtons

### a car travels 85 miles in 1.25 hours. how many miles per hour does it travel?

85 / 1.25 = 68 miles per hour

### a person has a mass of 50 kg. What is her weight on Jupiter? *Gravity on Jupiter is 2.5 times greater than on Earth.

9.8 x 2.5 = 24.5 (gravity on Jupiter)

50 x 24.5 = 1,225 Newtons

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