Question 1

Which of the following is a correct SI base unit for measuring mass?

Accepted Answer

kilogram

Question 2

A car accelerates from rest to $$20\ \mathrm{m/s} in$$ $$5\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 3

Which of the following best describes inertia?

Accepted Answer

The tendency of an object to resist changes in its motion

Question 4

A ball is dropped from a height and falls freely under gravity. Which equation gives the distance fallen after time $$t$$?

Accepted Answer

$$d = \frac{1}{2}gt^2$

Question 5

Which of the following is NOT a step in the scientific method?

Accepted Answer

Accepting results without question

Question 6

A $$2\ \mathrm{kg}$$ object moving at $$3\ \mathrm{m/s}$$ collides with a stationary $$1\ \mathrm{kg}$$ object. If they stick together after the collision, what is their final velocity?

Accepted Answer

$$2\ \mathrm{m/s}$$

Question 7

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 8

If a force of $$10\ \mathrm{N} is $$applied to a $$5\ \mathrm{kg}$$ object, what is its acceleration?

Accepted Answer

$$2\ \mathrm{m/s^2$}$$

Question 9

Which of the following best describes Newton's Third Law of Motion?

Accepted Answer

For every action, there is an equal and opposite reaction

Question 10

A $$0.2\ \mathrm{kg}$$ ball is thrown at $$10\ \mathrm{m/s}$$ and comes to rest in $$0.5\ \mathrm{s}$$ after hitting a wall. What is the impulse delivered to the ball?

Accepted Answer

$$2\ \mathrm{kg\cdot m/s}$$

Question 11

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 12

A $$3\ \mathrm{kg}$$ object is lifted to a height of $$4\ \mathrm{m}. $$What is its potential energy? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$117.6\ \mathrm{J}$$

Question 13

Which of the following is a correct statement about conservation of momentum?

Accepted Answer

The total momentum of a closed system remains constant if no external forces act on it

Question 14

Which of the following is the correct unit for power in the SI system?

Accepted Answer

watt

Question 15

A $$5\ \mathrm{kg}$$ object moving at $$2\ \mathrm{m/s}$$ collides elastically with a $$3\ \mathrm{kg}$$ object at rest. What is the total momentum before the collision?

Accepted Answer

$$10\ \mathrm{kg\cdot m/s}$$

Question 16

Which of the following is a pseudoscience rather than a scientific process?

Accepted Answer

Astrology

Question 17

A student converts $$50\ \mathrm{cm} to $$meters. What is the correct value?

Accepted Answer

$$0.5\ \mathrm{m}$$

Question 18

Which of the following is the correct formula for impulse?

Accepted Answer

$$J = F \Delta t$$

Question 19

A $$10\ \mathrm{kg}$$ box is pushed with a force of $$30\ \mathrm{N}$$ across a frictionless surface. What is its acceleration?

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 20

Which of the following is the correct formula for work done by a constant force?

Accepted Answer

$$W = F d$$

Fundamental Concepts in Physics: Units, Motion, and Energy

Guida di studio - Domande di pratica

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