Newton's Laws of Motion and Free Body Diagrams

Urban hits his golf ball but is disappointed when it doesn't follow the course to the left. What does Newton's First Law of Motion say about the travel of an object?

• Every action has an equal and opposite reaction applies.

• Inertia accelerates due to the unbalanced forces present.

• An object at rest will move when external force is applied

• It will travel in a straight path unless changed by an external force.

Newton's First Law of Motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force change the motion. This is sometimes called the law of

• acceleration

• force

• inertia

• uniformity

The image shows two opposite forces acting on a rolling cart, what can we say is true about the effect of the forces on the cart?

• it cannot be determined without knowing which man is stronger

• it cannot be determined because one man is taller than the other

• the forces are unbalanced, and net force on the cart moves it left

• the forces are unbalanced, and net force on the cart moves it to the right

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While driving down the road, this tiny hummingbird hit the windshield of a Maria's car. This is a clear case of Newton's third law of motion. The hummingbird hit the car and the car hit the hummingbird. Compare the force on both the hummingbird and the car's windshield (the hummingbird was unharmed).

• The forces are equal and opposite.

• The force on the windshield is greater.

• The force on the hummingbird is greater.

• The force of the hummingbird is less than that of the windshield.

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John and Angie were each pushing a box across the floor. They both push their own box with a force of 30 Newtons; however, Angie's box does not move. What can you infer is the reason Angie's box didn't move?

• No work was done on the box.

• Gravity did not act on the box.

• John's box might have been on an incline.

• She was probably smaller than John so she didn't have enough strength to move the box.

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Drag the item from the item bank to its corresponding match.​

• motion

• a change of position of an object

• force

• any change in speed or direction of an object's motion

• acceleration

• a force that resists motion between objects that are touching

• gravity

• push or pull of any kind

• friction

• an attractive force acting between two massive objects

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A 10-kg object is pushed across a rough surface. It begins at rest and accelerates to a speed of 4 m/s in a distance of 5m. Which fact(s) support the conclusion that the object experiences an unbalanced force?

• The rough surface has friction.

• The object has a mass of 10 kg

• The object accelerates across the surface.

• The object has a force applied to it and covers a distance.

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How does this photograph illustrate Newton's third law of motion?

• The greater the swimmer's acceleration, the more force applied and the lower his mass

• The more force the swimmer applies back on the wall, the faster his movement forward in the water

• In order for the swimmer to move forward in the water there must be an unbalanced force acting on the swimmer

• The force acting forward is greater than the force acting in the opposite direction: the swimmer accelerates

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Two forces act on the 2 kg box shown below. A 4 N force acts to the right and 6 N force acts to the left. What is the net force acting on the box?

• 10 N to the right

• 2 N to the right

• 10 N to the left

• 2 N to the left

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Two people are trying to push a large box across a floor. Each person pushes with an equal amount of force. The total amount of force they exert on the box is 500 newtons. Despite their efforts the box will not move. What is the amount of force exerted by the box on each person?

• 0 N

• 250 N

• 500 N

• 1500 N

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