Physical Science Section 2 Quiz

the unit of acceleration is

• (m/s²)

• jouls

• m

• s

A bus starts from rest and accelerates to 14 m/s in 4 s. What is the average acceleration of the bus?

• 3.5 m/s2

• 5.9 m/s2

• 10.5 m/s2

• 24 m/s2

A box sliding down an inclined plane attains a speed of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s
• 24 m/s²
• 9 m/s²
• 81 km/hr

A roller coasters accelerates from an initial speed of of 6.0 m/s to a final speed of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²
• 18 m/s²
• 16 m/s²
• 16 m/s

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.

• 2.2m/s²
• 7.0m/s²
• 5.7m/s²
• 70m/s²

Static Friction is present only when an object is at rest.

• True.

• False.

What is a friction force acting upon an object on wheels?

• Static 
• Sliding 
• Rolling 
• Fluid 

Friction always...

• Resists motion

• Is negative

• Goes against the applied force

• Is determined by weight

Kinetic friction is always ... than Static friction

• Greater

• Lesser

• Similar

• unrelated

An object is falling downward through Earth's atmosphere. In which direction is the air resistance force?

• Down

• Up

• Around the object

• Through the object