8th Grade Science STAAR Category 2

After training for two weeks, the athlete gets stronger and can apply more force to the weight. If he can now push the weight 100 meters in 74 seconds, what is his average speed, in meters per second, rounded to the nearest hundredth?

What does this graph represent?

• Constant speed
• Acceleration
• Not moving

The tendency of an object at rest to stay at rest unless it is acted upon by a force is ___________________

• inertia
• motion
• gravity
• lubricant

Which is an example of Newton's 2nd Law of Motion? (the acceleration of an object depends on the mass of the object and the force applied)

• throwing a baseball
• swimming
• jumping on a trampoline
• pushing a full shopping cart vs. pushing an empty shopping cart

Force = Mass x Acceleration
How much force is needed to accelerate a 130 pound runner at 2 m/sec?

• 9800 N
• 2000 N
• 260 N
• 65 N

55 mph north is an example of....

• speed
• velocity
• direction
• force

Which of the following IS NOT  acceleration?

• change in speed
• change in direction
• change in speed or direction
• change in mass

Force is measured in _____________.

• centimeters
• grams
• newtons
• liters

Which of Newton's Laws is being described?
a rocket lifting off the ground

• Law of Inertia / Newton's 1st Law
• Law of acceleration / Newton's 2nd Law
• Action - Reaction/ Newton's 3rd Law

Friction

• A push or pull that causes an object to move, stop, or change direction.direction.
• A change in position or location
• The force that causes objects with mass to attract one another.
• A force that resists the motion of two surfaces sliding across one another.