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Answer:
The correct answer is D) A mother pushes a stroller up a ramp. Here's why:
- Simple machines are basic mechanical devices that make work easier by changing the direction or magnitude of a force. They include things like:
- Inclined plane: A ramp is an inclined plane. It reduces the force needed to move an object vertically by allowing you to apply force over a longer distance.
- Lever: A lever is a rigid bar that pivots around a fixed point (fulcrum).
- Pulley: A pulley uses a wheel and rope to change the direction of force.
- Wheel and axle: A wheel and axle system uses a wheel to rotate an axle, allowing for easier movement.
- Wedge: A wedge is a triangular tool that can be used to split or separate objects.
- Screw: A screw is an inclined plane wrapped around a cylinder.
Let's analyze the options:
- A) A girl eats a sandwich: This involves the human body's internal systems, not a simple machine.
- B) A boy runs across a football field: This is human movement, not the use of a simple machine.
- C) A father drives a car to the office: A car is a complex machine, but it utilizes many simple machines within its design (like wheels and axles, gears, etc.). The question asks about a single simple machine in use.
- D) A mother pushes a stroller up a ramp: The ramp is the simple machine in this situation. It makes it easier to move the stroller uphill by reducing the force required.
Therefore, only option D demonstrates the use of a simple machine (the inclined plane).