motion in a straight line

• Acceleration is the rate at which velocity changes.
• The SI unit of acceleration is m/s^2
• Free fall is when an object falls under gravity alone, with no other forces acting on it.
• In freefall, objects have constant acceleration due to gravity (g = 9.81m/s^2)
• Distance travelled by an object falling from rest can be calculated using the formula s=0.5gt^2
• An object's displacement can be calculated by multiplying its average speed by time.
• Distance travelled is always greater than or equal to displacement.
• When an object is thrown vertically upwards, its initial velocity is positive but becomes negative as it rises above ground level.
• Average speed is calculated by dividing total distance traveled by total time taken.
• If an object has zero initial velocity, it will not move until acted upon by another force.
• The maximum height reached by an object depends on its initial velocity and the force of gravity.
• Acceleration is calculated as change in velocity over time.
• Average velocity is calculated as distance divided by time taken.
• Speedometer measures instantaneous speed.
• Speedometer measures average speed.
• Average speed is the total distance travelled divided by the total time taken.
• If an object reaches its highest point and then returns back down, it has experienced both positive and negative accelerations.