Forces Final Exam Review

Which example illustrates Newton's first law?

• A. A wheelbarrow will stay in place unless an unbalanced force acts upon it.

• B. The force of a wheelbarrow on the ground is in the opposite direction of the force of the ground on the wheelbarrow.

• C. More mass is added to a wheelbarrow, and a larger force is required to move it.

• D. The force of a wheelbarrow on the ground is equal to the force of the ground on the wheelbarrow.

This diagram shows two different forces acting on a skateboarder. The combined mass of the skateboard and the person is 72.3 kg. Based on this information, what is the acceleration of the skateboarder?

• 0.97 m/s^2 to the right

• 0.97 m/s^2 to the left

• 3.21 m/s^2 to the right

• 3.21 m/s^2 to the left

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This table shows the weights of four different objects that are sitting on the floor. Object | Weight (N) 1 | 25 2 | 33 3 | 16 4 | 8 A person tries to lift each object with a force of 18 N, upward. Which statement is supported by the data in the table?

• Objects 1 and 2 will not move, and objects 3 and 4 will accelerate upward.

• All of the objects will move, and object 2 will accelerate upward the fastest.

• Objects 1 and 2 will move downward, and objects 3 and 4 will move upward.

• None of the objects will move, but the normal force on all of the objects will increase.

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Two bicyclists are accelerating forward at the same rate. Biker 1 has less mass than Biker 2. Which statement describes the net force on the bikers?

• The net force on Biker 2 is greater than on Biker 1.

• Both bikers experience the same net force.

• The net force on Biker 1 is in the backwards direction.

• The net force on both bikers is changing.

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Which statement describes an action-reaction pair?

• You push on a car, and the car pushes back on you.

• The Moon pulls on Earth, and Earth pulls on the Sun.

• You push down on your shoe, and Earth's gravity pulls down on the shoe.

• A book pushes down on a table, and the table pushes down on the Earth.

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• 96.75 kg

• 62.40 kg

• 52.50 kg

• 61.92 kg

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Which force holds distant stars and other matter together in a galaxy?

• Gravitational

• Weak nuclear

• Electromagnetic

• Strong nuclear

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Two positively charged particles are 0.03 m apart. The first particle has a charge of 8.1 C, and the second a charge of 2.6 C. Which change would increase the electric force between the two particles?

• Increase the charge on each particle by 2.0 C.

• Decrease the charge on the first particle by 1.0 C.

• Increase the distance between the particles by 0.07 m.

• Decrease the charge on each particle by 1.0 C.

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One particle has a charge of 4.2 × 10⁻⁹ C, while another particle has a charge of 1.10 × 10⁻⁹ C. If the two particles are separated by 0.005 m, what is the electromagnetic force between them? The equation for Coulomb's law is Fₑ = kq₁q₂/r², and the constant, k, equals 9.00 × 10⁹ N·m²/C².

• 1.66 × 10⁻³ N

• 8.31 × 10⁻⁶ N

• 1.85 × 10⁻¹³ N

• 1.66 × 10⁻⁵ N

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In which scenario will the two objects have the greatest gravitational force between them?

• Mass of object 1 = 15 kg, Mass of object 2 = 12 kg, Distance between objects = 0.5 m

• Mass of object 1 = 15 kg, Mass of object 2 = 12 kg, Distance between objects = 1.5 m

• Mass of object 1 = 12 kg, Mass of object 2 = 12 kg, Distance between objects = 0.5 m

• Mass of object 1 = 12 kg, Mass of object 2 = 12 kg, Distance between objects = 1.5 m

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