Understanding Mechanical Advantage

If a person starts far ahead of you in a race, they will probably win because
1. they are faster.
2. you have an advantage.
3. they have an advantage.
A mechanical advantage means the machine
1. makes your job harder.
2. makes your job easier.
3. makes no difference.
Which of the following would give you a mechanical advantage?
1. A block of wood to sit on.
2. A glove to pull hot objects out of an oven.
3. A vacuum cleaner to pick up pieces of paper.
Which of the following would be the easiest way to get to the top of a tall hill? (Which would require the least amount of effort?)
1. Climb a very long, gradual path.
2. Climb a very steep path.
3. Climb a ladder almost straight up a cliff.
Which of the following is NOT an example of a mechanical advantage?
1. Climbing stairs to make it easier to get to the second floor.
2. Using a wheelbarrow to carry a large load of bricks.
3. Using a long lever to pick up a large rock.
4. A person lifts a large box up into a truck.
You push with 10 N onto a lever. The lever allows you to lift a 50 N rock. The lever
1. increases your force.
2. decreases your force.
3. has no effect on your force.
If you pull with 100 N to lift a 20 N box up into the air. The pulley system
1. increases your force.
2. decreases your force.
3. has no effect on your force.
If you are lifting a 30 N box. You have to push down 30 N on the other side of a lever. The lever
1. increases your force.
2. decreases your force.
3. has no effect on your force.
A simple machine with an MA = 1
1. increases force.
2. decreases force.
3. doesn't change force.
A simple machine with an MA of 3
1. increases force.
2. decreases force.
3. doesn't change force.
A simple machine with an MA of 0.25
1. increases force.
2. decreases force.
3. doesn't change force.
A simple machine with an MA greater than 1
1. increases force.
2. decreases force.
3. doesn't change force.
A simple machine with an MA less than 1
1. increases force.
2. decreases force.
3. doesn't change force.
A simple machine with an MA equal to 1
1. increases force.
2. decreases force.
3. doesn't change force.