Grade 11 Physics Worksheet: Forces

Forces Short Answer

Grade 11 Physics Forces Short Answer Medium 10 Questions 21 Views

Classroom Worksheet

Grade 11 Physics Worksheet: Forces

Forces Short Answer

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Grade: Grade 11

Subject: Physics

Topic: Forces

Time: 20 Minutes

Difficulty: Medium

Questions: 10

Instructions:
Answer each question in complete sentences and show your working where needed. Use correct physics terms and include units in your answers.

Skills Practiced:

Forces
Physics
Critical Thinking
Problem Solving

1Question

Define force in physics.

2Question

State the SI unit of force and name the instrument commonly used to measure it.

3Question

A box experiences a 12 N force to the right and a 7 N force to the left. What is the net force on the box?

4Question

Explain the difference between balanced and unbalanced forces.

5Question

A student pushes a desk, but it does not move. What can you say about the forces acting on the desk?

6Question

An object has a mass of 4 kg. Calculate its weight on Earth. Use g = 9.8 m/s².

7Question

A 10 kg object accelerates at 3 m/s². What is the net force acting on it?

8Question

A car travels at constant velocity on a straight road. What does this tell you about the forces acting on the car?

9Question

Describe how friction affects the motion of an object and give one example of friction being useful.

10Question

A 6 kg object is acted on by two horizontal forces: 18 N to the right and 6 N to the left. Calculate the net force and the acceleration of the object.

Answer Key

#	Answer
1	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), and it is commonly measured using a spring balance or force meter.
3	The net force is 5 N to the right.
4	Balanced forces are equal in size and opposite in direction, so the net force is zero. Unbalanced forces do not cancel, so the net force is not zero and the motion can change.
5	The forces are balanced. The push is being matched by friction and/or other opposing forces, so the net force is zero.
6	Weight = mg = 4 × 9.8 = 39.2 N.
7	Net force = ma = 10 × 3 = 30 N.
8	The forces are balanced, so the net force is zero. The driving force is equal to the resistive forces such as friction and air resistance.
9	Friction opposes motion and can slow down moving objects. It is useful for walking because friction between shoes and the ground prevents slipping.
10	Net force = 18 - 6 = 12 N to the right. Acceleration = F/m = 12/6 = 2 m/s² to the right.