Forces and Newton's Laws of Motion (AP and Honors)

When calculating the acceleration of the school's elevator, you should have gotten similar magnitudes for all calculations. What magnitude acceleration, to the 1/10th, did you calculate for the school's elevator?

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NGSS.HS-PS2-1

The net force on an object points to the left. Two of three forces are shown. Which is the missing third force?

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NGSS.HS-PS2-1

A ball rolls down an incline and

off a horizontal ramp. Ignoring

air resistance, what force or

forces act on the ball as it moves

through the air just after leaving

the horizontal ramp?

• The F_{Earth on ball} acting vertically down.

• A horizontal force that maintains the motion.

• A force whose direction changes as the direction of motion changes.

• The F_{Earth on ball} and a horizontal force.

• The F_{Earth on ball} and a force in the direction of motion.

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A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam?

• F_{Earth on beam}

• F_{Earth on beam} and F_{cable on beam} (aka., tension)

• F_{Earth on beam} and a force of motion

• F_{Earth on beam} and F_{cable on beam} (aka., tension) and a force of motion

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A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in?

• F_{Earth on sled} and kinetic friction

• F_{Earth on sled} and the force of the push

• F_{Earth on sled}, a normal force, and kinetic friction

• F_{Earth on sled}, a normal force, kinetic friction, and the force of the push

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NGSS.HS-PS2-1

A cart is pulled to the right with a constant, steady force. How will its acceleration graph look?

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A constant force causes an object to accelerate at 4 m/s². What is the acceleration of an object with twice the mass that experiences the same force?

• 1 m/s²

• 2 m/s²

• 4 m/s²

• 8 m/s²

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NGSS.HS-PS2-1

An object, when pushed with a net force F, has an acceleration of 2 m/s². Now twice the force is applied to an object that has four times the mass. Its acceleration will be

• 1/2 m/s²

• 1 m/s²

• 2 m/s²

• 4 m/s²

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NGSS.HS-PS2-1

A 40-car train travels along a straight track at 40 mph at constant speed. A skier speeds up as she skis downhill. On which is the net force greater?

• The train

• The skier

• The net force is the same on both.

• There's not enough information to tell.

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NGSS.HS-PS2-1

An object on a rope is lowered at constant speed.

Which is true?

• The rope tension is greater than the object’s weight.

• The rope tension equals the object’s weight.

• The rope tension is less than the object’s weight.

• The rope tension can’t be compared to the object’s weight.

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