Dynamics

A plane travelling at 200 m/s strikes a fly. Which of the following is the true statement?

• The force on the fly is greater than the force on the plane

• The force on the fly is equal to the force on the plane

• The force on the fly is smaller than the force on the plan

• The damage to the fly is equal to the damage to the plane

Tags

NGSS.MS-PS2-1

The upward force on an object falling through the air is ______________.

• gravity
• air current
• air resistance
• magnetism

What are the units on the coefficient of friction?

• none
• Newtons
• meters
• kilograms

Tags

NGSS.MS-PS2-2

A cart rolls down an inclined plane with constant speed as shown in the diagram below. Which arrow represents the direction of frictional force?

• A
• B
• C
• D

Tags

NGSS.HS-PS2-1

Friction is a force that _______ motion between two objects.

• resists
• aids 
• stops
• creates

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Is this object in equilibrium?

• Yes and it's moving right

• Yes and its at rest

• No, it's accelerating right

• No, it's at rest

Tags

NGSS.HS-PS2-1

The SI unit of force is the

• Kilogram
• newton
• gram
• slug

Which force provides upward support for objects that are on tables, floors, the ground, etc.?

• Normal force
• Pull force
• Weight force
• Friction force

JJ Watt (he's a football player) has a weight force of - 1283.8 N when standing on the ground. What is the normal force acting on him?

• 1283.8 N
• 12581.24 N
• 131 N
• -9.8 N

Tags

NGSS.HS-PS2-1