Forces

Weight is measured in units of

• kilograms (kg)

• Newtons (N)

• m/s²

How would your mass and weight change if you went to the moon?

• Both would change

• The weight changes, mass stays the same

• Mass changes, the weight stays the same

If Ms. Schroeder's cat has a mass of 9 kg, then his weight would be _______ N.

Ms Schroeder is trying to get her cat to lose weight, so she takes him to the moon. Her cat's mass is 9 kg, and the moon's acceleration due to gravity is 1.6 m/s². The cat's weight is now _____ N.

A hockey player hits the puck towards the goal using his hockey stick. At what point does the applied force stop acting on the puck?

• When the puck stops touching the stick

• When the puck starts slowing down

• When the puck comes to a stop

• When they win the game

Ms. Schroeder is trying to pull out her refrigerator, because her cat knocked his toy underneath it. She pulls on the refrigerator, but it doesn’t budge. What type of friction is resisting her pull?

• Kinetic

• Static

Newton’s 1st law of motion states that an object in motion tends to stay in motion at a constant velocity. If this is the case, why do we usually see moving things eventually come to a stop?

An object has two forces acting on it, an Up force and a Down force. If the Up force is stronger than the Down force, what can we say about the motion of the object?

• It has an upward velocity

• The net force on the object is zero

• It has a downward net force

• It has an upward acceleration

You push on the wall, applying a force to the right. What is the action-reaction force to the force of your push?

• There is no action-reaction force

• The ground pushes up on you

• The wall pushes you left

• You pull the wall left

Out in space, you throw a tennis ball away from you. Using Newton's 2nd and 3rd Laws, which of these will be the same about you and the ball?

• The force exerted on each

• The masses

• The accelerations