Unit 3: Forces and energy

Question 1

What are force diagrams?

Answer 1

Force diagrams tells us the size and direction of a force (the longer the arrow in the force diagram, the larger the force).

Question 2

What are balanced forces?

Answer 2

1. Stationary object.
2. Constant speed or height.
3. Forces of equal size acting in opposite directions.
4. Balanced forces cause no change in movement.
5. If the arrows are the same length, that means it is balanced forces.

Question 3

What are unbalanced forces?

Answer 3

1. Forces are not equal size.
2. The object changes direction.
3. The object moves forward.
4. The object slows down.
5. If the arrows are not in the same length, that means it is unbalanced forces.

Question 4

What is the standard unit for speed?

Answer 4

m/s (metres per second).

Question 5

What is the equation for speed?

Answer 5

Speed = distance divided by time.

Question 6

What is the equation for distance?

Answer 6

Distance = speed x time.

Question 7

What is the equation for time?

Answer 7

Time = distance divided by speed

Question 8

What is the equation for moment?

Answer 8

Moment = force x distance.

Question 9

What is the unit of force and distance?

Answer 9

The unit of force is newton and the unit of distance is metre.

Question 10

What is the unit of moment?

Answer 10

Nm (newton metre).