Seatwork 4: Newton's Laws of Motion

In a frictionless vacuum, a 10 kg body is moving horizontally at a velocity of +10 m/s. How much net force is needed to keep the body moving in the same speed and direction?

• 0 N

• 1 N

• 10 N

• 100 N

Which of the following statements on Newton’s Laws of Motion is FALSE?

• Both force and weight are measured in Newtons.

• Action and reaction forces are both exerted by a single body

• In a weightless environment like space, it requires force to set a body in motion.

• A lighter body will have greater acceleration than a heavier one when applied with a similar force.

Which of the following statements on Newton’s Laws of Motion is TRUE?

• Force is required to keep an object in motion.

• Inertia is the natural tendency of matter to resist motion.

• The presence of a net force on a body means that it is accelerating.

• The reaction force follows after an action force is applied on a body.

You are in the front seat of a fast-moving jeep when you notice a mosquito flying directly into the windshield and splattering. Which of the following statements on the given scenario is TRUE?

• Both bodies received the same force during the interaction.

• Both bodies received the same acceleration after the interaction.

• The jeepney has more mass; hence, the force exerted on it is greater.

• The jeepney has more mass; hence, the force received by it is greater.

Using Newton’s First Law of Motion, determine which of the following statements is FALSE?

• Unbalanced force is needed to accelerate an object from rest.

• Matter has a natural tendency to go back to a resting state/position.

• The Law of Inertia is applicable to both moving and non-moving objects.

• When a net force is absent, a moving object will continue moving at a constant speed in the same direction.

A net force of 22.8 N is exerted on a cart which made it accelerate at a rate of 7.29 m/s2. What is the mass of the cart?

• 0.32 kg

• 3.13 kg

• 22.8 kg

• 166.21 kg

A net force of 210.9 N is exerted on a table that has a mass of 63 kg. What is the acceleration of the table?

• 0.30 m/s2

• 3.35 m/s2

• 33.5 m/s2

• 35 m/s2

A ball is accelerating at a rate of 5.73 m/s2. Say that the mass of the ball is doubled and the net force on it is tripled, what would be its new acceleration?

• 2.87 m/s2

• 3.82 m/s2

• 5.73 m/s2

• 8.60 m/s2

A ball is accelerating at a rate of 11.25 m/s2. Say that the mass of the ball is tripled and the net force on it is halved, what would be its new acceleration?

• 1.88 m/s2

• 5.63 m/s2

• 11.25 m/s2

• 16.88 m/s2

A 0.58 kg object was initially at rest when it accelerated at a rate of 21 m/s2. What would be the net force applied on the object?

• 0.03 N

• 10.5 N

• 12.18 N

• 36.21 N