Speed, velocity, acceleration and freefall 0.0 / 5 ? PhysicsForces and MotionIGCSECIE Created by: KristenvermaakCreated on: 24-03-23 07:56 What is speed? Is the distance an object travels per unit time. Measured in m/s. 1 of 13 What is speed's equation? Distance travelled divided by time taken. 2 of 13 What are the two changes of speed called? Acceleration or deceleration. 3 of 13 What is velocity? Velocity is an object's direction and distance travelled per unit time. Measured in m/s. 4 of 13 What is the equation for velocity? Displacement divided by time. 5 of 13 What is acceleration? Is the rate of change of velocity. It describes how much an object's velocity changes every second. Measured in m/s 2 6 of 13 What is acceleration's calculation? Change in velocity (final-initial velocity) divided by change in time. 7 of 13 What are the two types of acceleration? Positive- when an object speeds up. Negative- when an object slows down. 8 of 13 What is constant acceleration? When an object accelerates at a steady rate. 9 of 13 What is the acceleration of free fall? In the absence of air resistance, all objects falling in a uniform gravitational field, fall with the same acceleration. 10 of 13 What happens if air resistance remains insignificant? The speed of a falling object will increase at a steady rate, getting larger the longer it falls. 11 of 13 What forces do objects falling through fluids in a uniform gravitational field experience? -Weight (due to gravity) -Friction (such as air resistance) 12 of 13 What happens to the force of air resistance when an object's speed increases? The force of air resistance increases with speed. 13 of 13
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