Bennett Mechanical Test Velocity and Gravity 4

Question 1

A train decelerates from 30 m/s to 0 m/s in 10 seconds. What is its acceleration?

Accepted Answer

-3 m/s²

Answer

3 m/s²

Answer

-30 m/s²

Answer

0 m/s²

Question 2

Terminal velocity occurs when which forces are balanced?

Accepted Answer

Gravity and air resistance

Answer

Mass and weight

Answer

Speed and direction

Answer

Friction and inertia

Question 3

Which object would reach terminal velocity sooner when falling?

Accepted Answer

A large open parachute

Answer

A small dense bolt

Answer

Both reach it instantly

Answer

Neither reaches it

Question 4

A ball thrown upward at 20 m/s takes about how long to reach its highest point?

Accepted Answer

2 seconds

Answer

1 second

Answer

4 seconds

Answer

10 seconds

Question 5

If you double an object's speed, how does its velocity vector change in magnitude?

Accepted Answer

It doubles

Answer

It halves

Answer

It stays the same

Answer

It quadruples

Question 6

Weight is best described as which of the following?

Accepted Answer

The force of gravity on an object

Answer

The amount of matter in an object

Answer

The speed of an object

Answer

The volume of an object

Question 7

A cyclist moving north at 10 m/s turns to move east at 10 m/s. Has the velocity changed?

Accepted Answer

Yes, direction changed

Answer

No, speed is the same

Answer

No, mass is the same

Answer

Only if speed changes