Forces and Motion Test Retake

An object at rest tends to remain at rest. This property is called ______________________.

• inertia
• momentum
• mass
• air resistance
• centripetal force

When air resistance exactly matches the downward force of gravity, a falling object stops accelerating and reaches ______________________.

• terminal velocity
• momentum
• mass
• inertia
• air resistance

Only in a vacuum or in space can an object be in ______________________.

• free fall
• momentum
• mass
• inertia
• air resistance

The horizontal movement given to an arrow by a bow is one component of ______________________.

• projectile motion
• momentum
• mass
• inertia
• air resistance

A car accelerating from 60 km/h to a constant speed of 80 km/h has increased its ______________________.

• momentum
• air resistance
• mass
• inertia
• centripetal force

A spacecraft orbiting Earth is both moving forward and

• a. at terminal velocity.
• b. in free fall.
• c. experiencing resistance.
• d. weightless.

Assuming 1 kg = 1,000 g, a 5 kg object has less inertia than an object with a mass of

• a. 4 kg.
• b. 6,000 g.
• c. 2 kg.
• d. 1,500 g.

If three balls of steel, rubber, and plastic were dropped at the same time from the same height, which would hit the ground first? (Assume there is no air resistance.)

• a. All would hit at the same time.
• b. The rubber ball would hit first.
• c. The steel ball would hit first.
• d. The plastic ball would hit first.

An astronaut uses a jet of nitrogen to maneuver in space. This can be done because of

• a. orbiting.
• b. free fall.
• c. momentum conservation.
• d. inertia.

Why does the passenger fall out when the golf cart turns

• The cart changed direction but the passenger's inertia caused them to continue at the same velocity
• The cart changed direction but the passenger's body remained at rest.
• The cart changed its velocity but the passenger's inertia caused it to change with the cart.
• There was an unbalanced force acting on the golf cart and the passenger