Forces and Newton's Laws Finals Review

Consider the traffic light (mass of 15.0 kg) suspended from two wires as shown in Figure. Neglecting the masses of the wires, What is the correct equation?

• F_net=T_2x+T_1x=0

• F_xnet=T_2x-T_1x=0

• T_2ycos45=T_2x-T_1x

• F_xnet=T_2y+T_1x=0

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NGSS.HS-PS2-1

Consider the traffic light (mass of 15.0 kg) suspended from two wires as shown in Figure. Neglecting the masses of the wires, What is the correct equation to solve for y component?

• T_1y+T_2y=w

• T_1y-T_2y=w

• T_1y+T_2y=T_1x

• T₁cos (30)= T₂Cos (45)

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NGSS.HS-PS2-1

Consider the traffic light (mass of 15.0 kg) suspended from two wires as shown in Figure. Neglecting the masses of the wires, find the tension of T₁

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NGSS.HS-PS2-1

a 75.0-kg man (weight of about 165 lb.) standing on a bathroom scale in an elevator. if the elevator accelerates upward at a rate of 1.20m/s². What is his weight in newton's while the elevator is accelerating upward?

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NGSS.HS-PS2-1

A dustbin of mass 12 kg standing on horizontal ground is pushed by a horizontal force of 72 N in the rightward direction. If the coefficient of friction is 0.4, what is the net force (to the whole number)

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NGSS.HS-PS2-1

A trunk of mass 30 kg is standing on a horizontal floor. The coefficient of friction, μ, between the trunk and floor is 0.3. What is the maximum force that can be applied without moving the box. (round to the whole number)

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NGSS.HS-PS2-1

The resistance of an object to any change in its motion is called ______________________.

• inertia

• friction

• gravity

• weight

A semi-truck driving down the interstate hits a grasshopper that smashes on the windshield. If the truck applies a 565 N force on the grasshopper, what is the magnitude of the force that the grasshopper applies to the truck?

• <565 N

• 565 N

• >565 N

• 0 N

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NGSS.HS-PS2-1

A baseball and a solid gold metal ball of equal size are dropped at the same time. Ignoring air resistance, which ball has the greater acceleration?

• the baseball

• the gold ball

• they both have the same acceleration

• there is not enough information to determine this

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

"For every action, there is an equal and opposite reaction."

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• Newton's 4th Law