Newton's Laws MC Practice AP Physics 1

The figure above shows the forces exerted on a block that is sliding on a rough horizontal surface: The weight of the block is 500 N, (take g = 10 m/s²) the normal force is 500 N, the frictional force is 100 N, and there is an unknown force F exerted to the right. The acceleration of the block is 0.4 m/s². The value of F is most nearly

• 20 N

• 80 N

• 110 N

• 120 N

Tags

NGSS.HS-PS2-1

A block is pulled along a surface of negligible friction by a spring scale that exerts a force F on the block. The mass of the block is 4 kg, and the spring scale reads 10 N. Which of the following free-body diagrams can be used to show the magnitude and direction of all the forces exerted on the block as it is pulled along the surface?

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Tags

NGSS.HS-PS2-1

The table shows experimental data of the magnitude of four forces exerted on a 2kg object as it slides across a horizontal surface. Which of the following could represent the magnitude of the net force that is exerted on the object? Select two answers.

• 6 N

• 10 N

• 28 N

• 30 N

Tags

NGSS.HS-PS2-1

Given the net forces on and the masses of the blocks shown above, which two blocks have the same acceleration? Select two answers

• Block A

• Block B

• Block C

• Block D

Tags

NGSS.HS-PS2-1

An object slides across a horizontal surface such that it slows down due to the force of friction that is exerted on the object. The object and the direction of its displacement are shown in the figure. Which of the following free-body diagrams could represent the forces that are exerted on the object?

Responses

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Tags

NGSS.HS-PS2-1

The diagram above shows the forces exerted on an object. Which of the following dot diagrams best represents the position of the object at equal time intervals?

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Tags

NGSS.HS-PS2-1

A 2 kg object is initially at rest at time t = 0s. It then slides across a rough, horizontal surface under the influence of only the four forces shown in the table above. What is the speed of the object at time t = 3s ?

• 12 m/s

• 14 m/s

• 24 m/s

• 36 m/s

Tags

NGSS.HS-PS2-1

A 5⁢ kg object is released from rest near the surface of a planet such that its gravitational field is considered to be constant. The mass of the planet is unknown. After 2 ⁢s, the object has fallen 30 m. Air resistance is considered to be negligible. What is the gravitational force exerted on the 5 ⁢kg object near the planet’s surface?

• 5 N

• 15 N

• 37.5 N

• 75 N

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Identical spheres are dropped from a height of 100 m above the surfaces of both Planet X and Planet Y. The position of the spheres as a function of time is recorded as the spheres fall. These data are shown in the graphs above. Which planet exerts a greater gravitational force on the sphere, and what evidence supports this conclusion?

• Planet X, because the object’s final speed is greater.

• Planet X, because the object’s time of fall is greater.

• Planet Y, because the area under the curve is smaller.

• Planet Y, because the magnitude of the slope of the curve increases at a faster rate.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Two identical blocks, block A and block B, are placed on different horizontal surfaces. Block A is initially at rest on a smooth surface, while block B is initially at rest on a rough surface. A constant horizontal force of magnitude F₀ is exerted on each block. After the force has been applied for a time t, the speeds of blocks A and B are v_A and v_B, respectively. Which of the following claims indicates the correct relation between v_A and v_B and provides the best justification for the relation?

• v_A < v_B The forces between the atoms in a block and the atoms in a surface oppose the motion of the block and are greater, on average, for block A.

• v_A < v_B The forces between the atoms in a block and the atoms in a surface oppose the motion of the block and are greater, on average, for block B.

• v_A > v_B The forces between the atoms in a block and the atoms in a surface oppose the motion of the block and are greater, on average, for block A.

• v_A > v_B The forces between the atoms in a block and the atoms in a surface oppose the motion of the block and are greater, on average, for block B.