Speed, Velocity, Acceleration

What does a negative acceleration indicate?

• It indicates that an object is speeding up.

• It indicates that an object is moving at a constant speed.

• It indicates that an object is slowing down.

• It indicates that an object is changing direction.

How can you describe the motion of a toy vehicle that travels at a constant speed?

• Uniform motion, where it covers equal distances in equal time intervals.

• Accelerated motion, where it speeds up over time.

• Random motion, where it changes direction frequently.

• Cyclic motion, where it moves in a circular path.

What is the significance of direction in velocity?

• It determines the object's path and can affect the overall motion.

• It only affects the speed of the object.

• It is irrelevant to the object's motion.

• It is only important in circular motion.

What is the difference between instantaneous speed and average speed?

• Instantaneous speed is the speed of an object at a specific moment in time, while average speed is the total distance traveled divided by the total time taken.

• Instantaneous speed is the average speed over a long period, while average speed is the speed at a specific moment.

• Instantaneous speed is always greater than average speed, while average speed can vary.

• Instantaneous speed is measured in kilometers per hour, while average speed is measured in meters per second.

What is the relationship between speed and time in a distance-time graph?

• The slope represents speed; a steeper slope indicates a higher speed.

• The slope represents distance; a steeper slope indicates a longer distance.

• Speed is independent of time in a distance-time graph.

• Time is represented by the area under the graph.

How can you determine if an object is in motion?

• An object is in motion if its position changes relative to a reference point over time.

• An object is in motion if it is moving at a constant speed.

• An object is in motion if it is not at rest.

• An object is in motion if it is being pushed or pulled.

What is the effect of friction on acceleration?

• Friction increases the acceleration of an object.

• Friction has no effect on acceleration.

• Friction opposes motion and can reduce the acceleration of an object, making it slower.

• Friction only affects the speed of an object, not its acceleration.

How is velocity different from speed?

• Velocity is a scalar quantity that only measures the speed of an object.

• Velocity is a vector quantity that includes both the speed of an object and its direction of motion.

• Velocity is the same as speed but measured in different units.

• Velocity is the rate of change of distance over time.

What is the formula for calculating acceleration?

• a = (final velocity - initial velocity) / time

• a = (initial velocity - final velocity) * time

• a = final velocity + initial velocity

• a = (final velocity + initial velocity) / time

What is the unit of measurement for acceleration?

• meters per second squared (m/s²)

• kilometers per hour (km/h)

• feet per second (ft/s)

• miles per hour (mph)