Force & Motion Unit Exam

Which of the following describes an application of Newton’s Law of Inertia (the tendency for things to remain unchanged)?

• A car stops suddenly, but the passengers in the car are thrust forward into the seat belts.
• The force pushing downward on a box is equal to the force pushing upward on the box.
• Earth’s tectonic plates collide with equal force and equal acceleration.

Dave runs a 400 m race with a speed of 4 m/s. What time will it take him to finish the race?

• 400 minutes

• 100 minutes

• 100 seconds

• .25 seconds

Traveling to Austin from Dallas takes 4 hours to go 200 miles. What is the average speed?

• 50 mph

• 20 mph

• 200 mph

• 50 kmh

A 20 kg bike accelerates at 10 m/s².  what was the force?

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

A force of 250 N is applied to an object that accelerates at a rate of 5 m/s². What is the mass of the object?

• 50 kg

• 2500 kg

• 50 m/s²

• 2500 N

What is the average speed of a ball if it rolls 20 meters in 40 seconds?

• 20 m/s

• 10 m/s

• 0.5 m/s

• 2 m/s

Two girls are pulling on opposite ends of a thick rope. Both girls pull on the rope with the same force but in opposite directions. If both girls continue to pull with the same force, what will most likely happen? 

• One girl will pull the other toward her.
• Both girls will stay in the same place. 
• Gravity will cause the rope to sag. 
• The rope will break.

The graph shows the motion of four cars. All four cars are moving east.   
Which car has a constant velocity? 

• 1
• 2
• 3
• 4

If no force is being applied to a stationary object, the object will...

• remain stationary.
• accelerate in the direction of the force.
• move at a constant speed in the direction of the force.
• accelerate in the opposite direction of the force

If an object is stationary (not moving) the forces acting upon it are _____________

• unbalanced
• weak
• balanced
• Hulk Smash!