Speed, Velocity, AccelerationOnline version 8th grade Physics True False Quiz by Maria Casby 1 Forces always occur in pairs. Yes No 2 Force equals mass times acceleration (F = ma). Yes No 3 An accelerating object’s distance-time graph is curved because its speed is changing. Yes No 4 If other forces (such as friction or another opposing force) counteract the applied force, the object may not move. Yes No 5 According to Newton’s Second Law, acceleration is directly proportional to force and inversely proportional to mass. Yes No 6 Speed is the change in position of an object per unit of time. Yes No 7 Velocity has both magnitude and direction, so it can be positive or negative depending on the direction of motion. Yes No 8 An object in motion will continue moving in a straight line unless acted on by a force. Yes No 9 Without friction or another force, an object will continue moving indefinitely according to Newton’s First Law. Yes No 10 If an object is not moving, no forces are acting on it. Yes No 11 An object moving with constant velocity has no acceleration. Yes No 12 A distance-time graph for an accelerating object is always a straight line. Yes No 13 Velocity is always positive. Yes No 14 Velocity is another term for speed. Yes No 15 Newton’s First Law is the law of inertia. Yes No 16 A car moving at a constant speed but turning is accelerating. Yes No 17 Applying more force to an object always makes it move. Yes No 18 If acceleration is zero, the object is at rest. Yes No 19 A ball rolling on the ground eventually stops due to friction. Yes No 20 Acceleration only occurs when an object speeds up. Yes No 21 Friction usually opposes motion, slowing objects down. Yes No 22 The steeper the slope of a distance-time graph, the faster the speed of the object. Yes No 23 Circular motion involves constant acceleration because the direction (and thus velocity) is changing. Yes No 24 Objects moving in a circular path are not accelerating because their speed remains constant. Yes No 25 Newton’s Third Law states that every action has an equal and opposite reaction. Yes No 26 If no force is acting on a moving object, it will eventually stop. Yes No 27 A greater force is needed to accelerate a larger mass. Yes No 28 A rocket moves forward because it expels gases backward, demonstrating Newton’s Third Law is acting on it. Yes No 29 Acceleration occurs when there is a change in velocity, which includes changes in direction. Yes No 30 The object could be moving at a constant velocity with zero acceleration. Yes No 31 A steeper slope of a distance-time graph ,represents a greater distance traveled in less time, indicating higher speed. Yes No 32 An object at rest will stay at rest unless acted on by an external force. Yes No 33 Velocity includes both speed and direction, whereas speed only measures how fast an object moves. Yes No
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