8P1 Forces and Energy

A wheeled cart is moving to the right at a constant speed.  Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?

• Balanced Forces, Constant Speed

• Balanced Forces, Acceleration

• Unbalanced Forces, Constant Speed

• Unbalanced Forces, Acceleration

Which could be an example of an unbalanced force?

• A plate sitting on a dining table

• A ball at the top of a hill that is not moving

• Earth orbiting the Sun 

• A baseball that has been thrown to home plate.

In the image, which hole will allow the water to spurt the furthest?

• A

• B

• C

• Same in A,B and C

When you increase your altitude, the atmospheric pressure

• increases

• decreases

• stays the same

• cannot be measured

Army tank tracks are useful for travelling through the mud because

• they decrease the force exerted on the ground

• they increase the force exerted on the ground

• they decrease the pressure exerted on the ground

• they increase the pressure exerted on the ground

Which of the statement is true?

• The shoe exerts less pressure than the stiletto heel as a result of an increase in surface area

• The shoe exerts less pressure than the stiletto heel as a result of an decrease in surface area

• The shoe exerts more pressure than the stiletto heel as a result of an increase in surface area

• The shoe exerts more pressure than the stiletto heel as a result of an decrease in surface area

Choose 2 possible answers.

A nut can be loosened more easily with

• a shorter spanner because a larger turning effect can be produced

• a longer spanner because a larger turning effect can be produced

• one hand because a larger turning effect can be produced

• two hands because a larger turning effect can be produced

A boy of weight 600N sits on the see-saw at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 200 N

• 450 N

• 800 N

• 1800 N

Arrange the liquids in order; from most dense to least dense

• 4, 3, 2, 1

• 1, 2, 3, 4

• 3, 4, 2, 1

• 4, 3, 1, 2

Moment (Nm) =

• Force (N) x distance (m)

• Angular Force (N°) x distance (m)

• Work done (J)

• Force (N) x distance (s)