Physical Science Semester 1 Final

Front

What is a lever?

Back

A lever is a simple machine that consists of a rigid bar that pivots around a fixed point called the fulcrum, used to lift or move loads.

Front

Where should the load be placed on a lever to make it easier to lift?

Back

The load should be placed near the fulcrum.

Front

What happens to the other bulbs in a parallel circuit if one bulb is removed?

Back

The other bulbs will stay on.

Front

What does a graph representing zero acceleration look like?

Back

A horizontal line, indicating constant velocity.

Front

How do you calculate potential energy?

Back

Potential Energy (PE) = mass (m) × gravity (g) × height (h).

Front

Calculate the potential energy of a 2,500 kg car on a hill 100 meters high.

Back

PE = 2,500 kg × 9.8 m/s² × 100 m = 2,450,000 J.

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv².

Front

Calculate the kinetic energy of a 5 kg cat running at 3 m/s.

Back

KE = 1/2 × 5 kg × (3 m/s)² = 22.5 J.

Front

What is the formula for calculating work done?

Back

Work (W) = force (F) × distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the principle of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.