SBQ: Work-Simple Machines (LO 5.1+5.2)

Compute for the GPE of 5m floor and 2 kg book.

• 10 kg.m

• 10 N

• 98 kg.m

• 98 N

It is the energy of a body in motion.

• GPE

• Kinetic

• EPE

• Work

Jiyo lifted a box of cookies with a force of 150 N at a height of 2 m. How much work did he do as he carried the box of cookies?

• 75 J

• 37.5 J

• 300 J

• 600 J

In case of negative work the angle between the force and displacement is ______.

• (a) 0°

• (b) 45°

• (c) 90°

• (d) 180°

If a fixed pulley has a MA of 1, how does it help us?

• Decreases the amount of force needed to lift an object

• Increases the amount of force needed to lift an object

• Changes the direction of the force

• Is not really helpful

What amount of force is required to push my fridge 80 m back to my house, using a total amount of 2 400 J of work?

• 42

• 192 000 N

• 0.033 N

• 30 N

How far along the road did the zookeepers push my fridge if they did 2 400 J of work on it through applying a force of 100 N?

The acceleration due to gravity is g = 9.81 m/s².

• 0.042 m

• 24 m

• 42

• 240 000 m

What simple machine can be used to split things apart and also it can hold open a door?

• Lever
• Pulley
• Wedge
• Screw

This picture is an example of a _________.

• pulley
• wedge
• wheel and axle
• screw

This picture shows an example of what type simple machine?

• pulley

• wedge

• lever

• wheel and axle