NCFE Physical Science Practice

A small object attached to the end of a string is swung in a horizontal circle at a constant linear speed. The linear speed of the object is doubled, and the length of the string remains the same. What effect does the change have on the centripetal acceleration of the object?

• It is reduced by half

• It remains the same

• It doubles

• It quadruples

Two rocks, one weighing 100 N and the other weighing 200 N, are dropped from a 50-m cliff at the same time. When both rocks are 10 m from the ground and air friction is ignored, which is the same?

• acceleration

• kinetic energy

• momentum

• potential energy

Tags

NGSS.HS-PS2-1

A ball is launched at an angle of 54° to the horizontal. What determines the amount of time the ball remains in flight? (Ignore air resistance.)

• initial velocity

• mass of the projectile

• centripetal acceleration

• composition of the projectile

• The object traveled 360 m during the 12 s and had a constant acceleration of 0 m/s/s.

• The object traveled 360 m during the 12 s and had a constant acceleration of 5 m/s/s.

• The object traveled 720 m during the 12 s and had a constant acceleration of 0 m/s/s.

• The object traveled 720 m during the 12 s and had a constant acceleration of 5 m/s/s.

Tags

NGSS.HS-PS2-1

A 25-kg bucket is being lifted by a rope. The rope will break if it experiences more than 350 N of tension. What is the maximum upward acceleration the bucket can experience without breaking the rope?

• 0.25 m/s/s

• 0.40 m/s/s

• 2.5 m/s/s

• 4.2 m/s/s

Tags

NGSS.HS-PS2-1

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Tags

NGSS.HS-PS2-1

A 52-kg bike is moving along a smooth road at a constant velocity of 8.4 m/s. What is the net force acting on the bike?

• 0 N

• 190 N

• 320 N

• 510 N

Tags

NGSS.HS-PS2-1

A 3.3-kg block rests on a table. A 2.1-kg box rests on top of the block. What is the magnitude of the normal force exerted by the table on the block?

• 12 N

• 26 N

• 32 N

• 53 N

Tags

NGSS.HS-PS2-1

Two automobiles travel on a circular track at the same speed at different times. The first car is twice as massive as the second. Which describes the centripetal forces acting upon the two cars?

• The centripetal force on the first car is half the centripetal force on the second car

• The centripetal forces on both cars are the same.

• The centripetal force on the first car is double the centripetal force on the second car

• The centripetal force on the first car is quadruple the centripetal force on the second car

Tags

NGSS.HS-PS2-1

Two carts of the same mass travel at the same speed toward each other. After they collide, each cart rebounds and moves in the opposite direction at the same speed as before the collision. What can be assumed about the collision?

• Momentum and energy are both conserved during the collision

• Momentum and energy both change during the collision

• Momentum is conserved, but energy changes during the collision

• Momentum changes, but energy is conserved during the collision

Tags

NGSS.HS-PS2-2