Grade 11 Physics Review Worksheet: Forces

Forces Review Worksheet

Grade 11 Physics Forces Review Worksheet Advanced 10 Questions 11 Views

Classroom Worksheet

Grade 11 Physics Review Worksheet: Forces

Forces Review Worksheet

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Grade: Grade 11

Subject: Physics

Topic: Forces

Time: 20 Minutes

Difficulty: Advanced

Questions: 10

Instructions:
Answer all questions clearly and show your working where needed. Use correct physics terminology, include units in calculations, and explain your reasoning for conceptual questions. Assume g = 9.8 m/s² unless told otherwise.

Skills Practiced:

Forces
Physics
Critical Thinking
Problem Solving

1Question

Define force and state its SI unit.

2Question

State Newton's First Law of Motion.

3Question

A 5.0 kg box experiences a net force of 20 N to the right. What is its acceleration?

4Question

A 12 kg cart is pulled with a 50 N force to the right while friction exerts 14 N to the left. What is the net force and acceleration of the cart?

5Question

A student pushes horizontally on a 10 kg crate with a force of 60 N. Friction is 25 N opposite the motion. Draw a free-body diagram in words by listing all forces acting on the crate.

6Question

A 2.5 kg object is lifted straight up at constant speed. What is the magnitude of the upward force applied?

7Question

A 15 kg sled on level ground is pulled by a 45 N force at constant velocity. What is the friction force acting on the sled, and why?

8Question

A 4.0 kg object is acted on by two horizontal forces: 18 N east and 11 N west. Find the net force and acceleration.

9Question

A 70 kg person stands in an elevator accelerating upward at 1.2 m/s². Calculate the normal force exerted by the floor on the person.

10Question

A 3.0 kg block is on a rough horizontal surface. It is pulled by a 20 N force at a 30° angle above the horizontal. The coefficient of kinetic friction is 0.20. Determine the block's acceleration.

Answer Key

#	Answer
1	Force is a push or pull that can change an object's motion or shape. Its SI unit is the newton (N).
2	An object remains at rest or continues moving at constant velocity unless acted on by a net external force.
3	Using F = ma, a = F/m = 20/5.0 = 4.0 m/s² to the right.
4	Net force = 50 N - 14 N = 36 N to the right. Acceleration = F/m = 36/12 = 3.0 m/s² to the right.
5	Forces acting on the crate: weight (10g = 98 N downward), normal force upward, applied force of 60 N to the right, and friction force of 25 N to the left.
6	Since the object moves at constant speed, net force is zero. The upward force equals the weight: F = mg = 2.5 × 9.8 = 24.5 N.
7	The friction force is 45 N opposite the pull. Because the sled moves at constant velocity, the net force is zero, so friction must balance the pulling force.
8	Net force = 18 N - 11 N = 7 N east. Acceleration = F/m = 7/4.0 = 1.75 m/s² east.
9	Using N - mg = ma, N = m(g + a) = 70(9.8 + 1.2) = 70(11.0) = 770 N.
10	Resolve the pulling force: horizontal component = 20 cos 30° ≈ 17.3 N, vertical component = 20 sin 30° = 10 N upward. Weight = 3.0 × 9.8 = 29.4 N, so normal force = 29.4 - 10 = 19.4 N. Friction = μN = 0.20 × 19.4 = 3.88 N. Net horizontal force = 17.3 - 3.88 = 13.42 N. Acceleration = 13.42 / 3.0 ≈ 4.47 m/s².