Prerequisite Knowledge for Momentum

Which of the following physical quantities is a vector?

• Distance

• Speed

• Time

• Displacement

A runner completes a lap around a track measuring 400 meters. If the runner starts and ends at the same point, which of the following statements is true?

• The distance covered is 400 meters, and the displacement is 0 meters.

• Both the distance covered and the displacement are 400 meters.

• The distance covered is 0 meters, and the displacement is 400 meters.

• The displacement is always that the distance covered.

What are the SI units of force?

• Joules (J)

• Newtons (N)

• Watts (W)

• Pascals (Pa)

Which of the following correctly represents the SI unit for the product of mass and velocity?

If an object has a mass of 10 kg and is subjected to a net force of 50 N, what is the acceleration of the object?

• 10 m/ s

• 15 m/ s

• 20 m/ s

• 25 m/ s

A cyclist travels a total distance of 120 m in 30 seconds. What is the average speed of the cyclist?

• 2 m/s

• 3 m/s

• 4 m/s

• 5 m/s

According to Newton's First Law of Motion, an object will remain at rest unless:

• It is acted upon by a balanced force.

• A net external force is applied to it.

• It has a mass.

• It is moving in a straight line.

Two ice skaters, one heavier than the other, push off from each other on a frictionless surface. Which of the following statements is true about their velocities after they push off?

• Both skaters move with equal velocity in opposite directions.

• The lighter skater moves faster than the heavier skater.

• The heavier skater moves faster than the lighter skater.

• Neither skater moves because the net force is zero

A car accelerates from rest under a constant force. Which of the following best explains why the car's velocity increases?

• The force adds to the car's velocity directly.

• The force increases the car's energy, which then increases its velocity.

• The force creates displacement, which increases the velocity.

• The force decreases the car's mass, increasing velocity.