1.2 form 4 speed, velocity and acceleration
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This document defines key motion terms like distance, displacement, speed, velocity, and acceleration. It also lists equations of motion and describes distance-time graphs and speed-time graphs. It explains that in a vacuum, all objects accelerate at the same rate due to gravity, but with air resistance lighter objects can accelerate faster than heavier ones. Acceleration due to gravity on different planets is provided. Finally, it defines terminal velocity as the constant speed an object reaches when air resistance equals the object's weight during free fall.
1.2 form 4 speed, velocity and acceleration
- 2. Revision 1. Define: 1. Distance 2. Displacement 3. Speed 4. Velocity 5. Acceleration 6. Deceleration 2. List the equations of motion
- 3. Distance – time graph On a distance time graph, distance is on the y-axis and time on the x-axis The gradient of a distance-time graph is numerically equal to the speed. p.28 comp. phy
- 4. Speed – time graph Speed is on the y-axis and time on the x-axis. The gradient is numerically equal to the acceleration. The area under the graph is equal to the distance covered. p.29 comp. phy.
- 5. Graphs of acceleration p.34
- 6. Free fall When a stone and a feather are dropped from the same height, the stone reaches the ground first. This is because of air resistance. However, when there is no air resistance, the stone and the feather hit the ground at the same time. The stone and feather have the same acceleration. This acceleration is called acceleration due to gravity (g).
- 7. LOCATION ACCELERATION DUE TO GRAVITY Earth 9.8m/s2 Mars 3.7m/s2 The Moon 1.6m/s2 Venus 9.5m/s2 Jupiter 24.5m/s2 The Sun 275m/s2
- 8. Qns.
- 9. Terminal Velocity When an object is falling freely, it accelerates. Its speed increases as well. Considering air resistance the object will reach a point when it stops accelerating. Its speed remains constant. This constant speed is called Terminal Velocity. Terminal velocity is defined as: a constant speed that a free falling object acquires when air resistance is equal to the weight of the object. Draw diagram*