Grade 11 Health Worksheet: Forces — Challenge Practice

Forces Challenge Practice

Grade 11 Health Forces Challenge Practice Advanced 5 Questions 23 Views

Classroom Worksheet

Grade 11 Health Worksheet: Forces — Challenge Practice

Forces Challenge Practice

Name____________________________

Date________________

Score______ / 5

Grade: Grade 11

Subject: Health

Topic: Forces

Time: 20 Minutes

Difficulty: Advanced

Questions: 5

Instructions:
Read each question carefully and answer in complete sentences where needed. Show your work for calculation problems. Think critically about how forces affect motion, safety, and the human body in real-life health situations.

Skills Practiced:

Forces
Health
Critical Thinking
Problem Solving

1Question

Define force and explain how it can affect the motion of an object or the body in a health-related setting.

2Question

A student lifts a 12 kg backpack from the floor to a desk. Using the formula weight = mass × gravity, calculate the backpack’s weight. Use 9.8 m/s² for gravity.

3Question

Explain why increasing the surface area of a landing position, such as bending the knees when jumping, can reduce injury risk.

4Question

A 60 kg athlete stops suddenly while running. Their momentum changes from 18 m/s to 0 m/s in 0.30 seconds. Calculate the average force on the athlete using F = mΔv/Δt.

5Question

A gymnast lands from a jump and notices that landing with stiff legs causes more pain than landing with bent knees. Use the ideas of impulse, force, and time to explain why bent knees are safer. Include how this understanding could be applied to prevent sports injuries.

Answer Key

#	Answer
1	A force is a push or pull on an object. It can change an object’s speed, direction, or shape. In health, forces act on the body during activities like walking, lifting, or falling, affecting movement and injury risk.
2	Weight = 12 kg × 9.8 m/s² = 117.6 N. The backpack’s weight is 117.6 newtons.
3	Increasing the surface area or distance over which the body stops lowers the force experienced at impact. Bending the knees increases the time and distance of deceleration, which reduces peak force on joints and helps prevent injury.
4	F = 60 kg × (0 - 18 m/s) / 0.30 s = -3600 N. The average force is 3600 N opposite the direction of motion.
5	Bent knees increase the time over which the body comes to a stop, which lowers the average force because impulse stays the same while stopping time increases. Stiff legs shorten stopping time, causing a larger force on the joints. Gymnasts and other athletes can reduce injury risk by practicing proper landing technique, absorbing force with the muscles, and using movements that spread impact over a longer time.