Q4SCIE_Reviewer

A body is said to be in uniform motion if

• its velocity is constant

• its acceleration is constant

• its displacement is constant

If you drop a feather and a coin at the same time in a tube filled with no air, which will reach the ground first?

• The coin.

• The feather.

• Neither they will both reach the ground at the same time

Acceleration is defined as the charge in

• Distance divided by the time interval.

• Velocity divided by the time interval.

A moving object can have

• Both kinetic and momentum.

• Potential energy, kinetic energy, and momentum.

A car with zero acceleration is moving due north at 60 km/hr. What is its velocity after 1 hour?

• 0 km/hr

• 60 km/hr

What do you call the horizontal displacement of projectile?

• Range

• Distance

A projectile is thrown 30° above the horizontal. What happens to its velocity along the horizontal as it moves upward?

• Remains the same

• It increases

A collision wherein two objects collide and then stick together and move in a common velocity is called

• Elastic collision

• Perfect inelastic collision

• None of the above

Which of the following happens in a perfectly inelastic collision?

• The objects involved are deformed to some degree.

• The objects involved stick together after collision.

• The objects involved move with common velocity after the collision.

• All of the above

A ball is thrown vertically upward. What is its acceleration about 1 second?

• 0 m/s2

• 10 m/s2

Answer explanation

9.8 m/s2 = (Round off) 10 m/s2