SCIENCE 8 Q1 M1

• FORCE - any push or pull that causes change in the motion of an object
• types of force: contact force and non contact force
• contact force is present when two or more surfaces or media touch and interact
• non contact force is constantly present in nature or does not need human intervention to arise
• motion is caused by unbalanced force
• speed is the length of distance traveled in a given amount of time.
• velocity is the rate of change of displacement, measured in metres per second (m/s)
• acceleration is the rate of change of velocity, measured in metres per second squared (m/s2)
• the car is going 100mph (speed)
• this car is going 100mph east (velocity)
• the car slowed down at the stop sign then sped up (acceleration)
• law of inertia - objects at rest stay at rest and objects in motion stay in motion unless acted upon by an external force
• law of inertia - an object in motion continues to move at the same speed and in the same direction unless acted upon by an external force
• inertia is an inherent property of an object to resist change, it is independent from external and it is mass dependent
• massive objects = greater inertia
• smaller objects = lesser inertia
• forces causes object to move
• forces can be represented as arrows
• inertia is