HES 102 Midterm 1 Review

As Amelia runs west, she begins to slow down. Her acceleration is __________

• Positive

• Negative

• Zero

A launched ball has an initial horizontal velocity of 3m/s. What is the ball's horizontal velocity 4 seconds later?

• 0m/s

• 12m/s

• 3m/s

• 7m/s

Answer explanation

In projectile motion, the horizontal velocity is constant (a = 0)

John is cycling at a speed of 4m/s. How many minutes will it take him to cycle 480m?

• 0.01 minutes

• 2 minutes

• 120 minutes

• 0.03 minutes

True or false? An object's acceleration is directly proportional to its mass.

• True

• False

Answer explanation

∑F = ma

Acceleration is directly proportional to the net force, but inversely proportional to mass.

Which of the following are vector quantities? (Select all that apply)

• Velocity

• Distance

• Mass

• Acceleration

True or false? In a perfectly elastic collision (e=1), both momentum and kinetic energy are conserved.

• True

• False

What is the value of angle θ?

• 62º

• 28º

• 118º

• Not enough information to answer

In which of the following conditions will ΣF = 0? (Select all that apply)

• An object is at rest

• An object is moving with a constant velocity

• An object is moving with a constant acceleration

• An object's acceleration is zero

True or false? 1N = 1kg⋅m/s²

• True

• False

Jimmy runs 10m across a gymnasium and turns around to run 10m back to his initial position. What is his displacement?

• 20m east

• 20m west

• 0m

• 100m east