Forces/Vectors

Which has more mass, a kilogram of feathers or a kilogram of iron?

• the feathers
• the iron
• neither, both masses are equal
• neither, they don't have any mass

After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals _____

• twice the force with which it was fired
• the same amount of force with which it was fired
• one half the force with which it ws fired
• zero, since no force is necessary to keep it going

A 10 N force and a 30 N force act on an object in opposite directions.  What is the net force on the object?

• 40 N
• 30 N
• 20 N
• 10 N

In the free-body diagram shown above, which of the following is the gravitational force acting on the balloon?

• 5120
• 4050
• 950
• 1520

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If a nonzero net force is acting on an object, then the object is definitely

• losing mass
• being accelerated.
• moving with a constant velocity
• at rest.

Tags

NGSS.MS-PS2-2

The length of a force vector represents the ______ of the force

• direction
• magnitude
• type
• cause

The free-body diagram shown above represents a car being pulled by a towing cable towards the left. In the diagram, the 5800 N force is

• he backward force the road exerts on the car.
• the gravitational force acting on the car.
• the force exerted by the towing cable on the car.
• the frictional force the road exerts on the car.

Tags

NGSS.MS-PS2-2

The free-body diagram represents a car being pulled by a towing cable. In the diagram, which
of the following is the gravitational force acting on the car?

• 5800
• 13 690
• 14 700
• 13 690 - 14 700   = -1110

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What causes a moving object to change direction? 

• acceleration
• inertia
• velocity
• force

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

This type of force is when one object pushes or pulls on another object by touching it

• contact
• gravity
• friciton

Tags

NGSS.MS-PS2-1