CBA 1 Review

What is TRUE about an object’s motion when the net force is equal to 0 N (forces are balanced)?

• The object is accelerating

• The object is moving slower than before

• The object is at rest

• The object is moving at a variable speed

A student pushes a box across a classroom.  He pushed the box with a force of 40 N.  The box accelerates at 0.5 m/s^2.  What is the mass of the box?

F(net) = ma

• 80 kg

• 20 kg

• 80 g

• 0.0125 kg

Tags

NGSS.MS-PS2-2

If the applied force on the 40 kg refrigerator is 90 N and the frictional force is 50 N.  What is the acceleration of the fridge?

F(net) = ma

• 2.25 m/s^2

• 1 m/s^2

• 1.25 m/s^2

• 0.44 m/s^2

Tags

NGSS.MS-PS2-2

A 75 kg student drives a 650 kg car.  What is the applied force on the car if the car starts from rest and accelerates to 60 m/s in 8 seconds?

F(net) = ma

• 5,400 N

• 4,875 N

• 43,200 N

• 96 N

Tags

NGSS.MS-PS2-2

An object with a mass of 110 kg is pulled with a force of 122 N, accelerating in the pulled direction at 0.9 m/s2. What is the frictional force of the object?

F(net) = ma

• 99 N

• 221 N

• 23 N

• 0 N

Tags

NGSS.MS-PS2-2

What is Newton’s second law? Select the BEST answer!

• F = ma

• F(net) = ma

• KE = (1/2)mv^2

• PE = mhg

Tags

NGSS.MS-PS2-2

What is the quantity that designates how fast and in what direction an object is moving?

• Speed

• Velocity

• Momentum

• Force

Tags

NGSS.MS-PS3-1

What is momentum?

• Momentum is the quantity of motion of a moving body, measured as the product of its mass and velocity.
  

• Momentum is the same as velocity.

• Momentum is the amount of work done on a system.

Tags

NGSS.MS-PS3-1

The stored energy that depends upon the relative position of the object in the system is...

• potential energy.

• kinetic energy.

• momentum.

• force.

Tags

NGSS.MS-PS3-2

The resistance that one surface or object experiences when moving over another is...

• applied force.

• frictional force.

• not a real thing.

• magnetic force.