Grade 11 Earth Science: Forces Challenge Practice Worksheet

Forces Challenge Practice

Grade 11 Earth Science Forces Challenge Practice Challenging 30 Questions 12 Views

Classroom Worksheet

Grade 11 Earth Science: Forces Challenge Practice Worksheet

Forces Challenge Practice

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Grade: Grade 11

Subject: Earth Science

Topic: Forces

Time: 20 Minutes

Difficulty: Challenging

Questions: 30

Instructions:
Read each question carefully and show your work when needed. Answer in complete sentences for explanation questions. Use correct science vocabulary and include units in calculations. The questions increase in difficulty.

Skills Practiced:

Forces
Earth Science
Critical Thinking
Problem Solving

1Question

Define force in your own words.

2Question

Name the SI unit used to measure force.

3Question

Give one example of a force acting in everyday life on Earth.

4Question

Which force keeps people and objects on Earth’s surface: gravity or magnetism?

5Question

What is the difference between mass and weight?

6Question

State Newton’s first law of motion.

7Question

What is the net force on an object when two equal forces act in opposite directions?

8Question

A 5 N force pulls east and a 2 N force pulls west on the same object. What is the net force and direction?

9Question

Explain why a book on a table does not move even though gravity acts on it.

10Question

What is friction?

11Question

Name two factors that can affect the amount of friction between two surfaces.

12Question

A 10 kg object has a weight of about how many newtons on Earth? Use 9.8 m/s² or 10 m/s² for estimation.

13Question

Describe how gravity affects the movement of rocks and soil on a hillside.

14Question

What is an unbalanced force?

15Question

A sled is pushed with 20 N east and friction pushes with 12 N west. What is the net force?

16Question

Why does an object accelerate when the net force on it is not zero?

17Question

State Newton’s second law of motion in words.

18Question

If the same force is applied to two objects, one with more mass than the other, which object will accelerate more?

19Question

A 4 kg rock experiences a net force of 12 N. What is its acceleration?

20Question

A 2 kg object and a 6 kg object are pushed with the same force. Which statement is correct?

21Question

Explain why a heavier boulder is harder to move than a smaller stone, even if both are made of the same material.

22Question

What is the relationship between force, mass, and acceleration in Newton’s second law?

23Question

A force of 30 N acts on a 5 kg object. What is the acceleration?

24Question

A 50 N force is used to move a crate, but friction is 50 N in the opposite direction. What happens to the crate’s motion?

25Question

How does gravity contribute to the formation of river channels and valleys over time?

26Question

Explain how friction can be both helpful and harmful in Earth science or everyday life.

27Question

A landslide begins after heavy rain. Describe two forces or conditions that may have contributed to the slide.

28Question

A 1,200 kg car has an acceleration of 2 m/s². What net force is acting on the car?

29Question

A glacier slowly moves downhill. Explain how gravity, pressure, and friction are involved in this motion.

30Question

A researcher measures a 15,000 N downward force on a rock slide on a slope and estimates friction and other resisting forces total 11,000 N uphill. What is the net force, and what does it imply about the slide’s motion?

Answer Key

#	Answer
1	A force is a push or pull that can change an object's motion or shape.
2	The SI unit of force is the newton (N).
3	Examples include gravity pulling an object downward or friction slowing a sliding book.
4	Gravity keeps people and objects on Earth’s surface.
5	Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.
6	An object at rest stays at rest, and an object in motion stays in motion unless acted on by an unbalanced force.
7	The net force is 0 N.
8	The net force is 3 N east.
9	The downward force of gravity is balanced by the upward normal force from the table, so the net force is zero.
10	Friction is a force that opposes motion between surfaces that are in contact.
11	Surface texture and the force pressing the surfaces together can affect friction.
12	About 98 N, or about 100 N using 10 m/s².
13	Gravity pulls rocks and soil downhill, helping cause mass wasting such as landslides and creep.
14	An unbalanced force is a force situation where the net force is not zero, causing a change in motion.
15	The net force is 8 N east.
16	A nonzero net force causes a change in velocity, which means the object accelerates.
17	An object’s acceleration depends on the net force acting on it and its mass.
18	The object with less mass will accelerate more.
19	3 m/s².
20	The 2 kg object will accelerate three times more than the 6 kg object.
21	The heavier boulder has more mass and more friction with the ground, so it requires a larger force to start moving.
22	Force equals mass times acceleration, or F = ma.
23	6 m/s².
24	The net force is zero, so the crate does not accelerate.
25	Gravity causes water to flow downhill, and moving water erodes and transports sediment, gradually shaping channels and valleys.
26	Friction is helpful because it allows walking and keeps vehicles from sliding, but it is harmful because it slows motion and causes wear, heat, and energy loss.
27	Gravity pulls material downhill, and water can reduce friction and add weight to the slope, making failure more likely.
28	2,400 N.
29	Gravity pulls the glacier downhill, pressure helps ice deform and flow, and friction with the ground slows the movement.
30	The net force is 4,000 N downhill, which means the slide will accelerate downhill.