Ch. 2 - Representing Motion

What is the resultant of two displacement vectors having the same direction?

• The resultant is the sum of the two displacements having the same direction as the original vectors.
• The resultant is the difference of the two displacements having the same direction as the original vectors.rs
• The resultant is the sum of the two displacements having the direction opposite to the direction of the original vectors.
• The resultant is the sum of the two displacements having the direction perpendicular to the direction of the original vectors.

A car is moving with a uniform speed of 15.0m/s along a straight path. What is the distance covered by the car in 12.0 minutes?

• 108km
• .180km
• 10,800km
• 10.8km

A racehorse is running with a uniform speed of 69 km/hr along a straightaway. What is the time it takes for the horse to cover 400 meters?

• 21 seconds
• 2.1 minutes
• 0.35 hours
• 27.6 hours

Which of the followiwn is a pair of vector quantities?

• Speed - Distance
• Velocity - Distance
• Velocity - Displacement
• Speed - Displacement

Which of the followiwn is a pair of scalar quantities?

• velocity - distance
• velocity - displacement
• time - speed
• time - displacement

Which choice is a valid way to contruct a motion diagram?

• Add together the average speeds of the various objects in motion
• Take a series of photographs at equal time intervals of a moving object, perpendicular to the direction of motion; overlay the images to see how the position changes with time.
• Draw bectors to represent the speeds involved.
• Add vectors in a head-to-tail manner to determine the resultant vector.

The final position minus the initial position is the

• average velocity
• motion diagram
• distance
• displacement

The y-intercept of a position-time graph of an object gives the average velocity of the object.

• true
• false

A collision between two moving objects can be represented on a position-time graph.

• true
• false

In a chosen coordinate system, the position of an object in motion can have negative values.

• true
• false