Forces & Motion

An airplane that moves 50 meters in one second has a speed of ______________________.  $speed\ =\frac{dis\tan ce}{time}$  

• 5 m/s

• 50 m/s

• 1,800 m/s

• 5,000 m/s

 A car traveling at 25 m/s speeds up to 40 m/s over a period of 15 seconds, the average acceleration of the car is ______________________________.  $acceleration\ =\ \frac{\text{}final\ speed\ -\ i\ nitial\ speed}{time}$  

• 1 m/s²

• 15 m/s²

• 15 km/s²

• cannot be calculated from the information given

Tags

NGSS.HS-PS2-1

A rider finishes a 120-km bicycle trip in 3 hours. The average speed of the rider is __________________.  $speed\ =\ \frac{dis\tan ce}{time}$  

• 360 km/h

• 3.6 km/h

• 40 km/h

• 4 km/h

An airplane flies 80 km in 10 minutes and then flies 100 km in 20 minutes. The average speed of the airplane is ___________________________.  $average\ speed\ =\ \frac{total\ dis\tan ce}{total\ time}$  

• 60 km/min

• 6 km/min

• 8 km/min

• None of the above

It can be important to know the velocity of an object, not just its speed, because __________.

• velocity also tells accerleration

• speed is always an average

• velocity also tells direction

• speed is only useful for fast-moving objects

Friction acts in a direction _______________________ to the direction of an object’s motion.

• unrelated

• opposite

• equal

• perpendicular

Unless an object at rest is acted upon by a force, it stays at rest due to its _______________.

• matter

• inertia

• friction

• gravity

A 10-kg ball is accelerated  $500\ \frac{m}{s^2}$   by a force of __________________________________.  $Force\ =\ mass\ x\ accerleration$  

• 5,000 N

• 50 N

• 500 N

• 0.50 N

Tags

NGSS.MS-PS2-2

A net force causes an object to ___________________.

• move forward then backward in direction

• not move

• speed up or slow down

• stay at the same speed

Tags

NGSS.MS-PS2-2

How far does the continent move in the first 1000 years?

• The continent moves 100 m in the first 1,000 years.

• The continent moves 500 m in the first 1,000 years.

• The continent moves 10 m in the first 1,000 years.

• The continent moves 1,000 m in the first 1,000 years.

Tags

NGSS.MS-ESS2-3