FORCE-AND-MOTION-Day-1-and-2

FORCE AND MOTION

Learning Targets

  • Identify motion and force

  • Differentiate balanced and unbalanced forces

  • Differentiate types of contact and non-contact forces

Force

  • Definition: A force is a push or pull that gives energy to an object to move, stop, or change direction.

  • Types of Forces:

    • Push

    • Pull

Motion

  • Definition: Motion is a change in position over a given time frame.

Balanced Forces

  • Definition: Balanced forces occur when two forces acting in opposite directions on an object are equal in size, resulting in no change in motion.

Unbalanced Forces

  • Definition: Unbalanced forces occur when one force is stronger than the other, causing a change in the object's motion.

Contact Forces

  • Examples:

    • Push

    • Friction

Field Forces

  • Description of field forces is not detailed, but refers to forces acting at a distance, such as gravitational or electromagnetic forces.

Key Physical Quantities

Quantity

Symbol

Unit

Formula

Force

F

N (Newton)

F = m * a

Mass

m

Kg (kilogram)

m = F / a

Acceleration

a

m/s² (meters per second squared)

a = F / m

Formula for Solving Force

  • F = m * a

Example Problem

  • Scenario: Ashly has a mass of 77 kg and accelerates at 5.2 m/s².

  • Given: m = 77 kg, a = 5.2 m/s²

  • Formula: F = m * a

  • Solution: F = (77 kg) * (5.2 m/s²)

  • Answer: F = 400.4 N

Try This!

  • Problem: A tennis ball is hit with 700 N and is accelerated at 27 m/s². What is the mass of the ball?

    • Given: Force = 700 N

    • Formula: m = F / a

    • Solution: m = 700 N / 27 m/s²

    • Answer: m ≈ 25.93 kg

  • Problem: A boy pushes some carts with a mass of 250 kg using 467 N of force. What is the acceleration?

    • Given: Force = 467 N, Mass = 250 kg

    • Formula: a = F / m

    • Solution: a = 467 N / 250 kg

    • Answer: a ≈ 1.87 m/s²