8 Force Dynamics

A truck collides with a small car and causes a lot of damage to the car. Which of the following is true

• the force on the truck is greater than the force on the car

• the force on the truck is equal to the force on the car

• the force on the truck is smaller than the force on the car

• the truck did not slow down during the collision

Tags

NGSS.MS-PS2-1

According to the 3^rd Law of Motion when a fish swims it moves forward because

• moving water currents cause it to move
• its fins push back on the water around it
• the water pushes forward in reaction to its fins pushing back
• gravity pushes the fish forward

What forces are on a sofa being slid across the floor?

• friction and applied force
• friction, applied force, gravity and normal force
• geometric, lateral and diagonal force
• applied force, net force, gravity and tension force

Tags

NGSS.MS-PS2-2

What is the name of the force that results or is left over when two or more forces act on an object

• tension force           
• normal force           
• net force           
• delta force

Tags

NGSS.MS-PS2-2

The resistance of an object to start moving or to stop moving once it is in motion _________________

• air resistance       
• inertia
• force 
• weight

These are forces acting on an object that are opposite in direction and equal in size. They cause no change in velocity ______________________

• Unbalanced Forces 
• Balanced Forces       
• Normal Force         
• Friction

F_f = µmg

How much frictional force is between this 120 kg couch and the carpet it is on if there is a coefficient of friction of 0.52?

g= -9.8 m/s²

• -62.40 N

• -611.52 N

• -458.36 N

• -130.32 N

Tags

NGSS.MS-PS2-2

The amount of matter that an object contains is its ________________

• shape

• density

• volume

• mass

How heavy an object is due to the pull of gravity from the planet it is on.

• inertia
• mass
• density
• weight

Tags

NGSS.MS-PS2-4

The friction an object has when it is slidiing/moving

• electric
• static
• kinetic
• opposite