STAAR Category 2

What law of motion does this picture represent?

• Newtons 1st law

• Newtons 4th law 

• Newtons 3rd law 

• Newtons 2nd law

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NGSS.MS-PS2-1

The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table below. Which vehicle has the greatest acceleration as it enters the highway? (a)  

• Sedan

• Coupe

• SUV

• Truck

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NGSS.MS-PS2-2

Safety belts protect people in cars in the event of an accident because, according to Newton’s Laws of Motion, when an impact causes the car to suddenly change its motion, -

• the people in the car will continue to move in the same direction and at the same speed as before the impact.

• the speed of the car always increases, giving it greater force since the mass will remain the same.

• the speed of the people always increases, since now they have, not one, but two forces acting on them.

• the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

According to Newton’s Law of Inertia, an object that is moving will change its motion only if what kinds of forces act on it? (a)  

• Constant forces

• Unbalanced forces

• Unbalanced forcesStrong forces

• Gravitational forces

Tags

NGSS.MS-PS2-2

According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because -

• the mass of the skateboard is the same as the mass of the person jumping off.

• the pull of gravity on the person is the same as on the skateboard, regardless of size.

• the air resistance on the person is great and the friction on the skateboard is small.

• for the force that sent the person forward, there is an equal force pushing back on the skateboard.

Tags

NGSS.MS-PS2-1

The masses of four objects are given in this table. If all of the objects have the same acceleration, which will require the greatest force? (a)  

• Object 1

• Object 2

• Object 3

• Object 4

Which beach balls have potential energy but not kinetic energy? (a)  

• Beach balls 1 and 3

• Beach balls 2 and 4

• Beach balls 1, 2 and 4

• Beach balls 2, 3 and 4

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

When a car goes around a corner at 20 mph, why do we say it  accelerates?

• The car is accelerating because of the velocity is constant

• The car accelerates because it's going 20 mph

• Cars always accelerate when they are in motion

• The car is accelerating because it's changing direction

If the car in the diagram rolls faster and faster as it moves down the ramp, you can be sure that

• there is no friction acting on the object.

• the forces acting on it are unbalanced.

• the net force on the car is 0 N.

• only gravity is acting on the car.

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NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Describe the motion in the graph (a)  

• Constant speed

• stopping

• decreasing speed

• deceleration

Tags

NGSS.MS-PS3-1