Newtons 1st and 2nd law practice

A book sits on a table. What forces are acting on it, and why doesn't it move?

• The force of gravity and the normal force are acting on it, and they balance each other so the book doesn't move.

• Only gravity acts on the book, so it doesn't move.

• Friction is the only force acting on the book, keeping it still.

• The book moves because there are no forces acting on it.

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NGSS.MS-PS2-4

A hockey puck slides across ice at constant velocity. What can you conclude about the net force acting on it?

• The net force acting on it is zero.

• The net force acting on it is directed forward.

• The net force acting on it is directed backward.

• The net force acting on it is increasing.

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NGSS.MS-PS2-2

Passengers in a car lurch forward when the brakes are applied suddenly because:

• of inertia, which keeps their bodies moving forward.

• the car speeds up suddenly.

• gravity pulls them forward.

• the seats push them forward.

Problem 1: A box experiences the following horizontal forces: • Push force to the right: 50 N • Friction force to the left: 20 N Calculate the net force and determine the direction of motion. Net force = _______ N, Direction: _______

• Net force = 30 N, Direction: right

• Net force = 70 N, Direction: right

• Net force = 30 N, Direction: left

• Net force = 20 N, Direction: right

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NGSS.MS-PS2-2

A car experiences: • Engine force forward: 800 N • Air resistance backward: 300 N • Rolling friction backward: 200 N Calculate the net force.

• 300 N

• 500 N

• 100 N

• 0 N

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NGSS.MS-PS2-2

An object has forces of 15 N east, 10 N west, and 8 N east acting on it. What is the net force?

• Net force = 13 N, Direction: east

• Net force = 7 N, Direction: west

• Net force = 3 N, Direction: east

• Net force = 17 N, Direction: east

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NGSS.MS-PS2-2

A 5 kg object experiences a net force of 20 N. Calculate its acceleration.

• a = 4 m/s^2

• a = 2 m/s^2

• a = 10 m/s^2

• a = 0.25 m/s^2

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NGSS.MS-PS2-2

A 2 kg ball accelerates at 3 m/s^2. What net force is acting on it?

• 6 N

• 3 N

• 9 N

• 1.5 N

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NGSS.MS-PS2-2

A net force of 100 N causes an object to accelerate at 4 m/s^2. What is the object's mass?

• 25 kg

• 4 kg

• 100 kg

• 400 kg

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NGSS.MS-PS2-2

A 10 kg box is pushed with a force of 60 N to the right. Friction opposes the motion with 25 N to the left. Calculate: a) Net force: _______ N

• 35 N

• 85 N

• 25 N

• 10 N

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NGSS.MS-PS2-2