Physics Chapter on Speed and Motion

Speed

• Defined as the distance travelled per unit time.
• Example: If a car travels 400 meters in 10 seconds, its speed is calculated as 20 m/s.

Force

• Described as a push or pull exerted on an object.

Motion

• Defined as the state where the distance of one object from another is changing.

Calculating Speed

• Example calculation: Moving 50 meters in 10 seconds results in a speed of 5 m/s.
• Another example: A little brother travels at 2.5 m/s for 5 seconds, covering a distance of 12.5 meters.
• If you can travel 3 m/s for 15 seconds to escape, you would cover 45 meters.

Distance and Time

• Time taken to walk 200 meters at 1.5 m/s is approximately 133 seconds.
• Lauren drives 16 km in 0.25 hours, averaging 64 km/h.

Key Formulas

• Distance is calculated using the formula: distance = speed * time.
• Time can be found using: time = distance/speed.
• Speed can be calculated with: speed = distance/time.

Example Problems

• Arriving in class 90 meters away after 45 seconds corresponds to a speed of 2 m/s.
• A bug takes 5 seconds to travel 5 meters at a speed of 1 m/s.
• A plane flying 395,000 meters in 9,000 seconds has a speed of approximately 44 m/s.