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If the cart is moving at a constant speed in a straight line, it is in uniform motion. If the cart is changing its speed or direction, it is accelerating.
Uniform acceleration motion is a type of motion where the acceleration value is constant.
Motion implies momentum, which implies velocity. Linear implies a straight line. Accelerating implies changing velocity. And uniform implies constancy. So, when an object moves in a straight line and accelerates at a constant rate, you have uniformly accelerating linear motion.
If an object is not accelerating, it can exist in two other states of motion: constant velocity motion (moving with a steady speed in a straight line) or at rest (not moving at all).
accelerating
The rate at which the speed or direction of its motion is changing.
Frame of reference is the measurement or observation that tells you that a car is accelerating. It uses the second law of motion to tell you rather or not the car is accelerating.
An accelerating force is a force that causes an object to change its speed or direction of motion, resulting in acceleration. It can be exerted by various means, such as gravity, friction, or propulsion systems, and its magnitude is directly related to the object's acceleration according to Newton's second law of motion.
Frame of reference is the measurement or observation that tells you that a car is accelerating. It uses the second law of motion to tell you rather or not the car is accelerating.
You are most aware of motion in a moving vehicle when it is accelerating, as you can feel the change in speed more distinctly. When the vehicle is moving steadily in a straight line, the sensation of motion becomes less noticeable because your body has adapted to the constant speed.
Parachutists and snowflakes do not fall with constantly accelerating motion because of air resistance. As they fall through the air, they experience a drag force that counteracts the force of gravity, eventually reaching a terminal velocity where the forces are balanced and they fall at a constant speed. This prevents them from accelerating indefinitely.