Forces Test Year 5

(F1) Explain how gravity would affect the ball after it is kicked.

Answer explanation

After the ball is kicked, gravity pulls it downward, causing it to follow a curved trajectory. This force eventually brings the ball back to the ground, affecting its height and distance traveled.

(F1) This brick is being pulled towards the ground. What is causing this to happen?

• Buoyancy
• Friction
• Magnetism
• Gravity

Answer explanation

The brick is being pulled towards the ground due to the force of gravity. Gravity is the natural phenomenon that attracts objects with mass towards each other, causing the brick to fall.

(F1) Why does the moon stay orbiting the Earth?

(F2) If you rub your hands together, they start to warm up. Why is this?

• Hands warm up due to increased blood flow.
• Rubbing hands together creates a vacuum.
• The skin absorbs heat from the air.
• Friction generates heat when you rub your hands together.

Answer explanation

Rubbing your hands together creates friction, which generates heat. This heat warms up your hands due to the conversion of kinetic energy from the motion into thermal energy.

(F2) Look at the arrow. Label the force that is in action here.

• Gravity
• Tension
• Air resistance (drag)
• Friction

Answer explanation

The force in action here is likely a push or pull, commonly referred to as applied force. The arrow indicates the direction and magnitude of this force acting on an object.

(F2) Look at the arrow. Label the force that is in action here.

• Gravity
• Friction
• Magnetic force
• Water resistance

Answer explanation

The force in action here is likely a push or pull, commonly referred to as applied force. This force is responsible for the movement indicated by the arrow.

(F3) This is a pulley. How does it help to lift objects?

• A pulley helps to lift objects by changing the direction of the force applied.
• A pulley only works in a vertical direction.
• A pulley requires no force to lift objects.
• A pulley increases the weight of the object being lifted.

Answer explanation

A pulley changes the direction of force, allowing you to lift heavy objects more easily by pulling down on a rope, which lifts the load up. This mechanical advantage reduces the effort needed to lift the object.

(F3) How does the position of the fulcrum affect the movement of the load?

• The position of the fulcrum affects the amount of force needed to move the load and the distance the load moves.
• The position of the fulcrum has no effect on the load's movement.
• The fulcrum determines the weight of the load.
• The fulcrum only changes the color of the lever.

Answer explanation

The position of the fulcrum determines the leverage and effort needed to move the load. A fulcrum closer to the load requires less effort, while moving it further away increases the effort needed to lift the load.

(F3) Mrs Gelling says that the higher the gear on a bike, the easier it is to move from a starting position. Explain why she is wrong.

Answer explanation

Mrs. Gelling is wrong because higher gears make it harder to start moving.

(F4) Here is a ball of paper and a sheet of paper. If I drop both from the school roof, which will fall fastest?

Answer explanation

The ball of paper will fall faster than the sheet of paper due to its smaller surface area, which reduces air resistance. The sheet of paper will flutter and fall slower.