Newton's Laws

Two 20.-newton forces act concurrently on an object. What angle between these forces will produce a resultant force with the greatest magnitude?

• 0°

• 45°

• 90°

• 180°

Two forces act concurrently on an object on a horizontal, frictionless surface, as shown in the diagram below. What additional force, when applied to the object, will establish equilibrium?

• 16-N rightward

• 4-N rightward

• 16-N leftward

• 4-N leftward

In the diagram below, a 20.-newton force due north and a 20.-newton force due east act concurrently on an object, as shown in the diagram below.The additional force necessary to bring the object into a state of equilibrium is

• 20-N Northeast

• 28-N Northeast

• 20-N Southwest

• 28-N Southwest

If a block is in equilibrium, the magnitude of the block's acceleration is

• zero

• decreasing

• increasing

• constant, but not zero

A 15-kilogram cart is at rest on a horizontal surface. A 5-kilogram box is placed in the cart. Compared to the mass and inertia of the cart, the cart-box system has

• more mass and more inertia

• more mass and the same inertia

• the same mass and more inertia

• less mass and more inertia

Which graph best represents the motion of an object that is in equilibrium?

• A

• B

• C

• D

Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below. The acceleration of the block is

• 5.0 m/s2 to the right

• 5.0 m/s2 to the left

• 3.0 m/s2 to the right

• 3.0 m/s2 to the left

A baseball bat exerts a force of magnitude F on a ball. If the mass of the bat is three times the mass of the ball, the magnitude of the force of the ball on the bat is

• F

• 2F

• 3F

• 4F

If the sum of all the forces acting on a moving object is zero, the object will

• slow down and stop

• change the direction of its motion

• accelerate uniformly

• continue moving with constant velocity

A ball rolls through a hollow semicircular tube lying flat on a horizontal tabletop. Which diagram best shows the path of the ball after emerging from the tube, as viewed from above?

• A

• B

• C

• D