Force and Its Effects

In which of these situations is no resultant force needed?

• A car changing direction

• a car slowing down

• a car speeding up

• a car moving in a straight line at a steady speed

A boat is travelling at a steady speed in a straight line across the surface of a lake. Which statement about the boat is correct?

• The resultant force on the boat is the direction of motion

• The resultant force on the boat is in the opposite direction to its motion

• The resultant force on the boat is vertically downwards

• The resultant force on the boat is zero

A car travels forward along a straight horizontal road. Only the horizontal forces acting on it are shown.

The length of each arrow represents the size of the force. How do these forces affect the motion of the car?

• The car moves at constant speed

• the car moves backwards

• the car slows down

• the car’s forward speed increases

Tags

NGSS.MS-PS2-2

Which list contains only properties of an object that can be changed by a force?

• Direction of motion, mass shape

• direction of motion, mass, speed

• direction of motion, shape, speed

• mass, shape, speed

A force acting on an object causes some properties of the object to change. Which list contains only properties that can be changed by the action of a force?

• Mass, motion and size

• mass, motion and shape

• mass, shape and size

• motion, shape and size

Which statement about a moving object is correct?

• When an object is accelerating, the resultant force acting on it must equal zero

• When an object is moving at a steady speed, the air resistance acting on it must equal zero

• When an object is moving at a steady speed, the resultant force acting on it must equal zero

• When an object is moving, there must be a resultant force acting on it.

Tags

NGSS.MS-PS2-2

A force acts on a moving rubber ball.

Which of these changes could not happen to the ball because of the force?

• change in direction

• change in shape

• change in mass

• change in speed

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The object in the diagram is acted upon by the two forces shown. What is the effect of these forces?

• The object moves to the left with constant speed

• The object moves to the left with constant acceleration

• The object moves to the right with constant speed

• The object moves to the right with constant acceleration

Tags

NGSS.MS-PS2-2

A train is travelling along a horizontal track at constant speed. Two of the forces acting on the train are shown in the diagram.

A force of air resistance is also acting on the train to give it a resultant force of zero.

What is this air resistance force?

• 40,000 N backwards

• 80,000 N backwards

• 40,000 N forwards

• 80,000 N forwards

Tags

NGSS.MS-PS2-2

A force 50 N acts on an object of mass 200 kg to the west and 40 N to the east.

What is the net force and its direction on the object?

• 10 N east

• 10 N west

• 90 N west

• 90 N east

Tags

NGSS.MS-PS2-2