Besides levers, which other simple machine is described in the text as needing less force to move an object?

In diagram B, what force is needed to lift the block directly upwards?

In diagram B, what force is needed to push the block up the ramp?

In diagram B, the 4 m ramp raises the block by 2 m. Using 500 N, how much work is done pushing the block up the ramp?

In diagram B, how much work is done lifting the 1000 N block directly upwards by 2 m?

In real life, a little more work is needed to push a block up a ramp than to lift it directly. Why?

What did some archaeologists think the Ancient Egyptians used ramps for?

According to the fact box, about how many blocks of stone were used to build the Great Pyramid at Giza?

Which of these is an everyday example of a ramp?

Two ramps lift the same load to the same height. Ramp 1 is 3 m long and ramp 2 is 6 m long. Which statement is correct?

In diagram D, what does pulley X do?

In diagram D, the weight is 100 N. What force is needed on the rope for pulley X to lift it?

In diagram D, pulley Z needs a 25 N force and the rope is pulled through 4 m. How much work is done?

In diagram D, the rope of pulley Y is pulled 2 m and the rope of pulley Z is pulled 4 m to lift the load 1 m. How do the distances compare?

A force of 75 N moves an object 8 m in the direction of the force. How much work is done?

450 J of work is done moving an object 9 m in the direction of the force. What is the force?

A force of 120 N does 360 J of work. How far does it move the object in the direction of the force?

A worker lifts a 250 N box directly upwards by 4 m. How much work does the worker do?

A 500 N load is raised by 2 m using a 10 m ramp (ignore friction). How much work is done?

For the same 500 N load on the 10 m ramp (raised 2 m, ignore friction), what force is needed to push the load up the ramp?

A worker pushes an 800 N crate up a 5 m ramp that raises it by 2 m (ignore friction). How much work does the worker do?

For the 800 N crate on the 5 m ramp (raised 2 m, ignore friction), what force is needed to push it up the ramp?

A pulley system needs a 50 N force to lift a 200 N weight. How far must the rope be pulled to lift the weight by 1 m?

A 90 N weight is lifted 2 m by pulling a rope 6 m. What force is used on the rope (ignore friction)?

A pulley system needs a force of 40 N to lift a 120 N load. How far must the rope be pulled to lift the load by 1 m?

Four pulley systems lift the same load by 1 m. Which one needs the rope to be pulled the furthest?

Which change would help reduce the extra energy wasted by friction in a pulley system?

Which rope is better for a pulley system lifting a heavy load?

A stretched rope stores some of the energy transferred by a person pulling it. What type of energy store is this?

A girl lifts a 20 N bag onto a shelf 3 m above the floor. How much gravitational potential energy does the bag gain?

In diagram D, each weight is lifted 1 m. What can be said about the gravitational potential energy gained by the three weights?

Which statement best describes the conservation of energy?

Simple machines can magnify (increase) a force. What does this mean?

Ignoring friction, what does a simple machine reduce?

A girl pulls a box along the floor with a force of 30 N for 5 m. How much work does she do?

The 150 J of work done pulling the box along a flat floor is mainly transferred to which energy store?

How much work is done when a force of 1 N moves an object through 1 m in the direction of the force?

Which pair of units is correct for force and distance when calculating work in joules?

A crane lifts a 5000 N load upwards by 10 m. How much work does the crane do on the load?

A 60 N weight is lifted directly upwards by 80 cm (0.8 m). How much work is done?