Chapter 3&4 (Basic)

Two forces of 5 N and 10 N act on an object in the same direction. What is the resultant force?

• 5 N

• 10 N

• 15 N

What is the formula for momentum?

• Mass × Velocity

• Force × Distance

• Weight × Acceleration

An object with a mass of 2 kg moves at 5 m/s. What is its momentum?

• 7 kg·m/s

• 10 kg·m/s

• 20 kg·m/s

Which of the following is true about the conservation of momentum?

• • Momentum is always conserved in a closed system.

• • Momentum is conserved only when forces are balanced.

• • Momentum is conserved only for objects at rest.

Two carts collide and stick together. What is conserved in this collision?

• • Speed

• • Momentum

• • Mass

What is the turning effect of a force called?

• • Work

• • Moment

• • Power

Which of the following increases the turning effect of a force?

• • Increasing the perpendicular distance from the pivot

• • Decreasing the perpendicular distance from the pivot

• • Reducing the force applied

A force of 10 N is applied 2 m away from a pivot. What is the moment of the force?

• • 5 Nm

• 20 Nm

• • 10 Nm

What is wrong about a body in equilibrium?

• • It has no nett force acting on it.

• • It has no weight.

• • It has no moment.

10. Which condition is required for a body to be in equilibrium?

• • Balanced moments only

• Balanced forces only

• • Balanced forces and balanced moments