Force and Motion STAAR Review

A bowling ball is rolled with a certain speed and strikes a bowling pin with a force indicated by the arrow in this illustration. When the bowling ball strikes the bowling pin, the force applied by the pin to the ball -

• depends on the mass of the bowling pin.

• is equal to the force applied by the ball.

• must be zero, since the pin is not moving.

• is equal to the force of gravity on both.

Tags

NGSS.MS-PS2-1

In a crash test dummy, the model flies forward after a sudden stop because it has-

• inertia

• a forward motion

• a backwards motion

• balanced forces

Tags

NGSS.MS-PS2-1

What is the acceleration of the 25 kg box that has 50 N of force applied to the right?

(Use the F=m(a) triangle)

Mathematical Equivalence

ON

Tags

NGSS.MS-PS2-2

Newton's 3rd law of motion states that (a)   forces balance each other.

• equal and opposite

• unequal and similar

• equal and similar

• unequal and opposite

Tags

NGSS.MS-PS2-1

What happens to an object when the net force acting on it is zero?

• It moves at a constant velocity

• It accelerates

• It disappears

• It changes shape

Select ALL the correct information. Choose Three

Is this Balanced or Unbalanced? What is the Net Force? What is the Direction of the Force?

• left

• right

• 250N

• 1250N

• unbalanced

Answer explanation

Unbalanced, 250N to the right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Match the correct example with the law it matches with

• Newton's 3rd law

• When an object is at rest it will stay at rest until a force acts upon it.

• Newton's 1st law

• A crate getting pushed.

• Newton's 2nd law

• Every action has an equal and opposite reaction.

Tags

NGSS.MS-PS2-1

Force is known as a push or a pull.

When the forces acting on an object are equal, the forces are considered ​ (a)   . This means the object has ​ (b)   and the object has ​ (c)   or constant motion.

When the forces acting on an object are not equal, the forces are considered to be ​ (d)   . This means the object ​ (e)   in a specific direction with a specific amount of net force.

• balanced

• unbalanced

• no net force

• no motion

• is moving

Tags

112.20.b.6.A

How does Newton’s third law explain how a rocket takes off?

• The rocket’s acceleration is positive, while the gasses acceleration is negative but the direction is the same. 

• The rocket is at rest until ignition.

• The hot gasses move in one direction, while the rocket moves in the opposite direction but with equal force.

Tags

NGSS.MS-PS2-1

An attempt is made to dislodge ketchup from the bottom of the ketchup bottle. The bottle is turned upside down, quickly pushed with a strong force in a downward motion, and then stopped. The ketchup immediately moves to the opposite end of the bottle. This scenario is an example of Newton's

• law of force and acceleration

• law of magnetism

• law of inertia

• law of gravity

Tags

NGSS.MS-PS2-1