Question 1

A 5.0 kg box is resting on a horizontal table. What is the magnitude and direction of the normal force exerted by the table on the box?

Accepted Answer

$$F_N = 49\ N$$\ in\ the\ upward\ direction$

Question 2

A student takes a 2.0 kg physics textbook to the Moon, where the acceleration due to gravity is $$1.6\ m/s^2$. What is the weight of the textbook on the Moon?

Accepted Answer

$$W = 3.2\ N$$

Question 3

A car has a mass of $$1200\ kg. $$What is its weight on Earth?

Accepted Answer

$$W = 11760\ N$$

Question 4

Which of the following statements is true about mass and weight?

Accepted Answer

Mass is a property of an object and does not change with location, while weight depends on the local gravitational field.

Question 5

A 0.75 kg book is placed on a shelf. What is the normal force exerted by the shelf on the book?

Accepted Answer

$$F_N = 7.35\ N$$

Question 6

A 10 kg object is suspended from a spring scale in an elevator accelerating upward at $$2.0\ m/s^2$. What is the reading on the scale?

Accepted Answer

$$F = 118\ N$$

Question 7

A 15 kg suitcase is placed on a scale in an airport on Earth. What does the scale read?

Accepted Answer

$$147\ N$$

Question 8

If a 20 kg object is taken to a planet where $$g = 15\ m/s^2$, what is its weight on that planet?

Accepted Answer

$$W = 300\ N$$

Question 9

A 50 kg astronaut travels from Earth to a space station where there is no gravity. What happens to the astronaut's mass and weight?

Accepted Answer

Mass remains the same, weight becomes zero.

Question 10

A 2.5 kg block is at rest on a horizontal surface. What is the net force acting on the block?

Accepted Answer

$$0\ N$$

Question 11

A 900 kg car has a weight of $$W = 8820\ N on $$Earth. What would its weight be on a planet where $$g = 3.7\ m/s^2$ (like Mars)?

Accepted Answer

$$W = 3330\ N$$

Question 12

A 24 N block is hanging from a spring scale. What is the mass of the block?

Accepted Answer

$$m = 2.45\ kg$$

Question 13

Which of the following is NOT a contact force?

Accepted Answer

Gravitational force

Question 14

A 14 N brick is sitting on a table. What is the normal force supplied by the table?

Accepted Answer

$$14\ N$$\ upwards

Question 15

A 6.0 kg bowling ball is placed on the floor. What is the force of gravity (weight) acting on it?

Accepted Answer

$$58.8\ N$$

Question 16

A 2.0 kg box is sitting on a table. What is the normal force acting on the box?

Accepted Answer

$$19.6\ N$$

Question 17

Which of the following properties of an object is likely to change if the object is taken to another planet?

Accepted Answer

Weight

Question 18

A 0.85 kg book sits on a shelf. What is the magnitude and direction of the normal force acting on the book?

Accepted Answer

$$8.3\ N$$\ upwards

Question 19

A 245 N object is located near the surface of Earth. What is its mass?

Accepted Answer

$$25\ kg$$

Question 20

Which of the following best describes the normal force?

Accepted Answer

A force exerted perpendicular to a surface that supports the weight of an object

Dynamics I: Mass, Weight, and Normal Force

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